LED constant current driver and constant current IC inventory

LED constant current driver Introduction

Since LED is a characteristic-sensitive semiconductor device with negative temperature characteristics, it needs to be stabilized and protected during application, which gives rise to the concept of driver. LED devices have almost harsh requirements for driver power supply . Unlike ordinary incandescent bulbs, LED can be directly connected to 220V AC mains. LED is driven by a low voltage of 2 to 3 volts, so complex conversion circuits must be designed. Different LED lamps for different purposes must be equipped with different power adapters. In the international market, foreign customers have very high requirements for the efficiency conversion, effective power , constant current accuracy, power supply life, and electromagnetic compatibility of LED driver power supply. These factors must be considered comprehensively when designing a good power supply, because the role of power supply in the entire lamp is as important as the human heart.

LED driver power supply is a voltage converter that converts power supply into a specific voltage and current to drive LED to emit light. Under normal circumstances: the input of LED driver power supply includes high-voltage industrial frequency AC (i.e. mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformer), etc. The output of LED driver power supply is mostly a constant current source that can change the voltage as the forward voltage drop value of the LED changes. LED power supply core components include switch controller , inductor , switch components (MOSfet), feedback resistor, input filter device, output filter device, etc. According to the requirements of different occasions, there are also input overvoltage protection circuit, input undervoltage protection circuit, LED open circuit protection, overcurrent protection and other circuits.

Constant current drive of LED

When using LED as a display or other lighting device or backlight, it needs to be driven with constant current. The main reasons are:

1. Avoid driving current exceeding the maximum rating to affect its reliability.

2. Obtain the expected brightness requirements and ensure the consistency of brightness and color of each LED

3. It can effectively avoid lightning strikes, power grid surges, overcurrent, and overvoltage protection, thereby increasing the life of the LED.

Problems:

The heat dissipation problem must be handled properly. If the heat dissipation problem is not handled properly, it will affect the life of the LED.

At present, LEDs are all driven by DC, so a power adapter, i.e., LED driver power supply, needs to be added between the mains and the LED. Its function is to convert the AC mains into DC power suitable for LEDs. According to the power usage rules of the power grid and the driving characteristics of LEDs, the following points should be considered when selecting and designing LED driver power supplies:

1. High reliability

Especially the driving power supply of LED street lamps , which is installed at high altitude, is inconvenient to maintain and the maintenance cost is also high.

2. High efficiency

LED is an energy-saving product, and the efficiency of the driving power supply must be high. This is especially important for the structure where the power supply is installed in the lamp. Because the luminous efficiency of LED decreases as the temperature of the LED increases, the heat dissipation of the LED is very important. The more efficient the power supply is, the less power it consumes, and the less heat it generates in the lamp, which reduces the temperature rise of the lamp. This is beneficial to delaying the light decay of the LED.

3. High power factor

The power factor is the load requirement of the power grid. Generally, there is no mandatory index for electrical appliances below 70 watts. Although a low power factor of a single low-power electrical appliance has little impact on the power grid, when everyone turns on lights at night, the same load is too concentrated, which will cause serious pollution to the power grid. For 30-40 watt LED driver power supplies, it is said that in the near future, there may be certain index requirements for power factor.

4. Drive mode

There are two common methods now: one is that a constant voltage source supplies multiple constant current sources, and each constant current source supplies power to each LED separately. This method has flexible combination, and the failure of one LED does not affect the operation of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, and the LEDs are operated in series or parallel. Its advantage is that the cost is lower, but the flexibility is poor, and the problem of a certain LED failure not affecting the operation of other LEDs must be solved. These two forms coexist for a period of time. The multi-channel constant current output power supply method will be better in terms of cost and performance. Perhaps it will be the mainstream direction in the future.

5. Surge protection

LEDs have poor surge resistance, especially reverse voltage resistance. It is also important to strengthen protection in this area. Some LED lights are installed outdoors, such as LED street lights. Due to the start-up of the grid load and the induction of lightning strikes, various surges will invade from the grid system, and some surges will cause damage to the LEDs. Therefore, the LED driver power supply must have the ability to suppress the intrusion of surges and protect the LEDs from damage.

6. Protection function

In addition to the conventional protection functions of the power supply, it is best to add LED temperature negative feedback in the constant current output to prevent the LED temperature from being too high.

7. Protection

For external installation type of lamps, the power supply structure should be waterproof and moisture-proof, and the outer shell should be sun-resistant.

8. The life of the driver power supply should match the life of the LED

9. To comply with safety regulations and electromagnetic compatibility requirements

Classification by drive mode

(1) Constant current type

The output current of the constant current drive circuit is constant, but the output DC voltage varies within a certain range with the size of the load resistance. The smaller the load resistance, the lower the output voltage, and the larger the load resistance, the higher the output voltage.

The constant current circuit is not afraid of load short circuit, but it is strictly forbidden to open the load completely;

Constant current drive circuit is ideal for driving LED, but the price is relatively high.

Attention should be paid to the maximum current and voltage used, as this limits the number of LEDs that can be used.

(2) Voltage stabilization

When the parameters in the voltage stabilization circuit are determined, the output voltage is fixed, but the output current changes with the increase or decrease of the load;

The voltage stabilizing circuit is not afraid of open-circuit load, but it is strictly forbidden to completely short-circuit the load;

When driving LEDs with a voltage-stabilizing drive circuit, each string needs to be added with a suitable resistor to make each string of LEDs display an even brightness;

Brightness is affected by changes in rectified voltage.

4. Advantages and disadvantages of overall constant current and channel-by-channel constant current working modes

Compared with the overall constant current, although the channel-by-channel constant current has more disadvantages and higher cost, it can truly protect the LED and extend the life of the LED, so the channel-by-channel constant current is the future trend.

5. Insufficient LED power supply

The reasons why LED driver power supply is currently insufficient:

The technical staff of the company producing LED lighting and related products do not have enough understanding of switching power supplies . The power supplies they make can work normally, but some key evaluations and electromagnetic compatibility considerations are not enough, and there are still certain hidden dangers;

Most LED power supply manufacturers have transformed from ordinary switching power supplies to LED power supplies, and their understanding of the characteristics and uses of LEDs is still insufficient;

There are almost no standards for LEDs at present, most of which refer to the standards for switching power supplies and electronic rectifiers;

At present, most LED power supplies are not standardized, so the quantity is mostly small. The purchase quantity is small, the price is high, and the component suppliers are not very cooperative;

Stability of LED power supply: wide voltage input, high and low temperature operation, over-temperature and over-voltage protection and other issues have not been solved one by one;

First of all, the overall life of the drive circuit, especially the life of key components such as capacitors at high temperatures, which directly affects the life of the power supply;

LED drivers should challenge higher conversion efficiency, especially when driving high-power LEDs , because all power that is not output as light is dissipated as heat, and low power conversion efficiency affects the energy-saving effect of LEDs ;

At present, in applications with lower power (1-5W), the cost of constant current drive power supply accounts for nearly 1/3, which is close to the cost of light source, affecting market promotion to a certain extent.

LED constant current IC chip inventory

South Korea LDT
LD1016 16-bit maximum 90mA LED screen Curtain, guardrail lamp constant current Driver IC
LD1048 48-bit built-in PWM high grayscale LED constant current driver IC
LD1071 16-bit built-in PWM high grayscale LED constant current driver IC
LD1018 High-precision 16 (1.5% between bits, 3% between chips) constant current driver IC

SIPEX
SP6682 High-efficiency charge pump regulator for white LED configuration
SP6683 High-power LED driver with parallel structure configuration
SP6685 Charge pump LED driver for camera flash
SP6686 400mA buck/boost charge pump LED driver
SP6687 4-channel charge pump white LED driver
SP7680 Multi-channel parallel backlight
IR International Rectifier
IRS2540 200V AC direct drive 1W multiple LED driver IC, 500mA
IRS2541 600V AC direct drive 1W multiple LED driver IC, 500mA
Taijing Technology
T6309A Mobile phone backlight
T6309B Mobile phone backlight
T6313A Mobile phone backlight
T6319A Mobile phone backlight LED parallel fixed voltage backlight driver IC
T6311A Street light
T6316A/B Street light
T6326A Flashlight equipment Low voltage dropout current multi-channel adjustable 400mA
T6335A Mining lamp
T6336A Lawn lamp
T6315A Lawn lamp
T6317A MR16-1W 7-24V 350mA 1W multiple driver IC
T6325A MR16-3/5W 7-24V 700mA Multiple LED driver IC
T6327A Mining lamp main and auxiliary lamps with multiple current options Fixed low voltage dropout is LED constant current driver
T6329A Lithium iron phosphate battery mining lamp boost LED driver constant current IC
Toshiba
TB62725 8-bit constant current driver IC
TB62726AN/AF 16-bit full-color LED large screen
TB62726ANG/AFG 16-bit full-color LED large screen
TCA62746AFG/AFNG 16-bit full-color LED large screen with short circuit detection
National Semiconductor
LM3402/04/02HV/04HV 6V to 42V / 75V, 200 mV feedback voltage . Fast PWM dimming
Supertex
HV9910 8V-450VDC input, PWM dimming, maximum 1A constant current IC
HV9930 8V-200VDC input, PWM dimming, constant current IC
CL2 Two-leg 90V 20mA LED Driver

Guangpeng Technology
A701, A702 Fixed 5-30mA lighting constant current
A703 120mA switchable 6-50V step-down constant current IC
A705 220mA, 2.7-12V fixed step-down single-channel constant current IC
A706 5-40mA, 5-50V/PWM multi-channel switchable constant current IC
AMC711x Fixed low current lighting application
AMC711x_E Fixed low current lighting application
AMC7135 2-6V low voltage drop fixed constant current driver IC 1 LED
AMC7140 5-50V DC&DC Maximum 500mA current adjustable, 1 or more LED driver IC
AMC7150 5-24V DC&DC Maximum 1.5A fixed, 1-3 LED driver IC
AMC7169 LED protection IC

Macroblock Technology
MBI1801 1-way constant current driver 1.2A current can be set PWM signal grayscale adjustment
MBI1802 2-way constant current driver 360mA current can be set PWM signal grayscale adjustment for two channels separately
MBI1804 4-way constant current driver 240mA current can be set PWM signal grayscale adjustment
MBI1816 16-way constant current driver current can be set PWM signal grayscale adjustment
MBI5016 16-bit maximum 90mA LED screen, guardrail lamp constant current driver IC
MBI5024 For low-end customers 16-bit LED screen, guardrail lamp constant current driver IC
MBI5025 16-bit maximum 45mA LED screen, guardrail lamp constant current driver IC
MBI5026 16-bit maximum 90mA LED screen, guardrail lamp constant current driver IC
MBI5030 16-bit built-in PWM high grayscale LED constant current driver IC
MBI5031 16-bit built-in PWM high grayscale LED constant current driver IC, relative to 5030 low-end customers
MBI5168 8-bit LED screen, guardrail lamp constant current driver IC
Dot Crystal Technology
DD311 Single channel high power constant current driver IC maximum 1A maximum withstand voltage 36V linear constant current
DD312 Single channel high power constant current driver IC maximum 1A maximum withstand voltage 18V linear constant current
DD313 Three channel high power constant current driver IC 500mA R/G/B constant current driver IC
DM412 Three channel decorative lighting dedicated direct data cascade constant current IC 200mA R/G/B constant current driver IC
DM413 Three channel decorative lighting dedicated PWM output driver IC 100mA R/G/B constant current driver IC
DM114A, DM115A New version of 8-bit driver IC is mainly used for screens and lighting
DM115B General 8-bit constant current driver IC constant current consistency and high stability
DM11C 8-bit driver IC With short breakpoint detection and temperature protection functions, the screen lighting uses
DM13C 16-bit driver IC With short breakpoint detection and temperature protection functions, the screen lighting uses
DM13A 16-bit constant current driver, facing low-end screen customers
DM134, DM135, DM136 16-bit driver IC Mainly used for LED screens and guardrail tubes
DM132 16-bit 1024-level PWM output driver IC
DM137 16-bit open, short circuit, over-temperature intelligent detection driver IC
DM133 16-bit open circuit detection & 64-level current adjustment & over-temperature warning driver IC
DM163 8x3 channel 4096-level PWM driver IC
DD211 Double boost driver IC 2-3.3V Maximum boost 100mA fixed constant current IC
DD231 3-channel driver IC 5-30mA Can be set to light up when the small body is powered on
DD233 4-channel driver IC 5-30mA Small, switchable IC
DD212 1.5-5.5V double boost, maximum 400mA current output to drive single LED constant current IC
PC112, PC113 2.8-5V quadruple boost to drive 20mA low-power multiple LED constant current IC
ST2225A 35 output channels of digital/alphabet LED driver chip
Austria Microelectronics
AS3691 4-way 400mA linear constant current PWM adjustable driver IC, mainly used for large-size backlights and full-color lighting
ADI
AD8240 Automotive LED turn signal application IC
ADM8843 Charge pump LCD small screen LED backlight
ADM8845 1 x, 1.5 x or 2 x pump backlight driver IC
ADP1653 IC specifically for cellular camera phone flash application

Fairchild Semiconductor
FAN5611/12/13/14 PDA/MP3 and other low-end LED backlight application IC
FAN5617 1X, 1.5X, and 2X lithium battery double voltage LED backlight driver IC
FAN5616 Pump type PWM adjustable grayscale backlight driver IC
FAN5607 1X, 1.5X, and 2X Mode 4*30mA (120mA)
FAN5608 2.7-5V boost constant current driver small screen backlight IC up to 16 LEDs
FAN5609 Three-state pump backlight driver (4×20mA) 80mA PDA, DSC, MP3 Players
FAN5610 Low voltage drop <350mV Lithium battery small screen backlight constant current IC

TI Texas Instruments LED screen part
TLC5904 8/16 channel LED driver
TLC5905 8/16 channel LED driver
TLC5911 16 channel LED driver
TLC5916/TLC5917 8 channel LED driver
TLC5920 16 channel LED driver
TLC5921 16 channel LED driver TLC5922 16 channel LED driver
with dot correction TLC5923 16 channel
LED driver with dot correction
TLC5924 16 channel LED driver with dot correction function and pre-charge FET
TLC5930 12 channel LED driver
TLC5940 16 channel LED driver with EEprom dot correction and grayscale PWM control
TLC5941 16 channel LED driver with dot correction and grayscale PWM control
TLC5945 with dot correction, grayscale PWM Control and delay-free 16-channel LED driver
TI Texas Instruments White LED driver
TPS60250 1.2A high-power, high-efficiency charge pump for 7 WLEDs with I2C interface
TPS60251 1.2A high-power, high-efficiency charge pump for 7 WLEDs with I2C interface
TPS60252 Synchronous boost converter I2C/parallel interface White driver
TPS6102* Adjustable, 1.5A switching, 96% efficient boost converter with buck mode
TPS61040/41 28V 400mA switching boost converter for LCD and white LEDs
TPS61042 30V 500mA switching boost converter for white LED applications
TPS61043 Boost PWM grayscale adjustable constant current LED driver
TPS61045 28V 85% Efficient Boost Converter for LCD ApplicationsTPS61055
1.2A High Power White LED Driver with I2C Compatible Interface Data Sheet Not PublishedTPS61058
High Power Single White LED Driver with 1.1A
SwitchTPS61059 High Power Single White LED Driver with 1.5A
SwitchTPS61060 15V, 400mA Switch, 1MHz Boost Converter with White LED Brightness Control
SupplyTPS61061
TPS61062
TPS61080 27V, 500mA Switch, 1.2MHz Boost Converter with Integrated Power DiodeTPS61081
27V, 500mA Switch, 1.2MHz Boost Converter with Integrated Power DiodeTPS61140 Application IC
with Dual OLED and LCD Backlight Driver
TPS61141 Application IC with Dual OLED and LCD Backlight Driver
TPS61150 Backlight driver IC with dual outputs using a single control
TPS61151 Backlight driver IC with dual outputs using a single control
TPS61150A Backlight driver IC with up to 14 LEDs using a single control
TPS61160 PWM white LED driver Specification not available
TPS61161 PWM white LED driver Specification not available
TPS61165 PWM white LED driver Specification not available
TPS75103 LDO low voltage drop backlight LED driver IC
TPS75105 LDO low voltage drop backlight LED driver IC

Hangzhou Silan Microelectronics Co., Ltd.
SB16726 16-bit constant current driver full-color screen IC
SC16722 cascadable, high-current output dedicated LED driver circuit
SB42351 350mA low-voltage dropout white light fixed LED driver chip
SB42510 PWM control, 1A white light LED constant current chip
Quanxin Electronic Technology Co., Ltd.
QX2703 small body boost backlight indicator
QX7135 fixed low-voltage dropout 10-400mA constant current driver
QX7136 fixed low-voltage dropout 10-400mA constant current driver
QX9910 high-power 20mA-2A, 2.5V-45V direct drive constant current IC
QX9920 programmable LED drive current, programming range is 10mA to 1A
QX62726 LED large screen 16-bit shift constant current driver

Maxim white LED driver
MAX8678 White LED integrated application IC on speaker
MAX1698, MAX1698A Portable LCD screen backlight white LED driver application IC
MAX1848 Small screen lithium battery monochrome LED backlight constant current driver IC for mobile phones
MAX1916 Small low-dropout constant current driver IC
MAX1910/MAX1912 Lithium battery 1.5x/2x double-voltage LED driver, maximum 120mA
MAX1570 Lithium battery 1x/1.5x double-voltage LED driver, multi-channel PWM dimming
MAX1984/MAX1985/MAX1986 White LED ultra-high efficiency constant current driver
MAX1582/MAX1582Y Programmable boost 2-stage constant current driver IC
MAX1553/MAX1554 High efficiency, boost to 40V for 2 to 10 white LED converter drivers
MAX1573 White pump 1 x/1.5 x Driver, small size QFN package
MAX1561/MAX1599 High efficiency, step-up converter 26V drive 2 to 6 white LED drivers
MAX1574 180mA, 1x/2x double voltage white pump driver IC 3mm x 3mm TDFN small package
MAX1583 White guide camera-flash boost converter
MAX1575 White LED driver 1x/1.5x charge pump light source indication
MAX1576 480mA white LED 1x/1.5x/2x charge pump from backlight to camera flash application
MAX1578/MAX1579 TFT screen and LED backlight Integrated driver application IC
MAX8595Z/MAX8596Z High efficiency, step-up 32V, 2-8 LED driver application
MAX1577Y/MAX1577Z 1.2 A White LED flash application IC
MAX8630W/MAX8630X 125mA 1x/1.5x Charge Pump for 5 White LEDs in Small TDFN Package
MAX8631X/Y LED Charge Pump 1x/1.5x/2x 4mm x 4mm Dual LDOs Make Ultra-Thin QFN Package
MAX8790 Six-Line White LED Constant-Current Driver for Notebook and Other Mid-Sized LCD Backlights
MAX8607 1MHz PWM Boost Converter for 1.5A White LED Applications Camera Flash
MAX8647/MAX8648 Ultra-High Efficiency Charge Pump for 6LED/RGB Driver Applications in Thin QFN Package
MAX16800 High Voltage 6.5-40V Driver 35-350mA Multiple LED Application Driver IC
MAX16801A/B PWM Controller 265VAC-85VAC 1A LED Driver
MAX16802A/B PWM Controller 10.8VDC-24VDC 1A LED Driver
MAX16803 High-voltage, 350mA, high-brightness LED drivers with PWM dimming and 5V regulator
MAX16804 High-voltage 5.5V-40V, 350mA driver and PWM dimming control
MAX16805/MAX16806 EEPROM-programmable, high-voltage, 350mA desk lamp and other spot dimming driver applications
MAX16807/MAX16808 Integrated 8-channel LED driver with switch-mode boost and SEPIC controller
MAX16809/MAX16810 Integrated 16-channel LED driver with switch-mode boost and SEPIC controller
MAX16818 1.5 MHz, 30A high-efficiency LED constant-current driver
MAX16819/MAX16820 2MHz high-brightness LED driver with 5000:1 grayscale adjustment
MAX16823 High-voltage 4.5-40V, 3 independent channels, 5mA to 70mA and up to 2A when connected to an external BJT