UC3844BD1G datasheet, PDF - EEWORLD Datasheet

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UC3844BD1G: DescriptionSwitching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max; CategoryPower/power management The power supply circuit; File Size404KB，19 Pages; ManufacturerON Semiconductor; Websitehttp://www.onsemi.cn

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Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max

UC3844BD1G Parametric

Parameter Name	Attribute value
Brand Name	ON Semiconductor
Is it lead-free?	Lead free
Parts packaging code	SOIC
package instruction	SOP, SOP8,.25
Contacts	8
Manufacturer packaging code	751-07
Reach Compliance Code	compliant
ECCN code	EAR99
Factory Lead Time	1 week
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	25 V
Minimum input voltage	12 V
Nominal input voltage	15 V
JESD-30 code	R-PDSO-G8
JESD-609 code	e3
length	4.9 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	1 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	SINGLE
Maximum switching frequency	275 kHz
technology	BIPOLAR
Temperature level	COMMERCIAL
Terminal surface	Tin (Sn)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	40
width	3.9 mm
Base Number Matches	1

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The UC3844B, UC3845B series are high performance fixed frequency

current mode controllers. They are specifically designed for Off−Line

and dc−dc converter applications offering the designer a cost−effective

solution with minimal external components. These integrated circuits

feature an oscillator, a temperature compensated reference, high gain

error amplifier, current sensing comparator, and a high current totem pole

output ideally suited for driving a power MOSFET.

Also included are protective features consisting of input and

reference undervoltage lockouts each with hysteresis, cycle−by−cycle

current limiting, a latch for single pulse metering, and a flip−flop

which blanks the output off every other oscillator cycle, allowing

output deadtimes to be programmed from 50% to 70%.

These devices are available in an 8−pin dual−in−line and surface

mount (SOIC−8) plastic package as well as the 14−pin plastic surface

mount (SOIC−14). The SOIC−14 package has separate power and

ground pins for the totem pole output stage.

The UCX844B has UVLO thresholds of 16V (on) and 10V (off), ideally

suited for off−line converters. The UCX845B is tailored for lower voltage

applications having UVLO thresholds of 8.5V (on) and 7.6V (off).

Features

UC3844B, UC3845B,

UC2844B, UC2845B

High Performance

Current Mode Controllers

http://onsemi.com

PDIP−8

N SUFFIX

CASE 626

SOIC−14

D SUFFIX

CASE 751A

•

SOIC−8

D1 SUFFIX

CASE 751

Trimmed Oscillator for Precise Frequency Control

Oscillator Frequency Guaranteed at 250 kHz

Current Mode Operation to 500 kHz Output Switching Frequency

Output Deadtime Adjustable from 50% to 70%

Automatic Feed Forward Compensation

Latching PWM for Cycle−By−Cycle Current Limiting

Internally Trimmed Reference with Undervoltage Lockout

High Current Totem Pole Output

Undervoltage Lockout with Hysteresis

Low Startup and Operating Current

These Devices are Pb−Free and are RoHS Compliant

NCV Prefix for Automotive and Other Applications Requiring

Unique Site and Control Change Requirements; AEC−Q100

Qualified and PPAP Capable

7(12)

Undervoltage

Lockout

7(11)

Output

Oscillator

Latching

PWM

6(10)

Power

Ground

5(8)

Current

Sense Input

3(5)

GND

5(9)

PIN CONNECTIONS

Compensation

Voltage Feedback

Current Sense

(Top View)

Compensation

Voltage Feedback

Current Sense

ref

Output

ref

Output

GND

Power Ground

ref

8(14)

ref

Undervoltage

Lockout

5.0V

Reference

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 15 of this data sheet.

4(7)

Voltage

Feedback

Input

2(3)

Output/

Compensation

1(1)

Error

Amplifier

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 16 of this data sheet.

Pin numbers in parenthesis are for the D suffix SOIC-14 package.

Figure 1. Simplified Block Diagram

Semiconductor Components Industries, LLC, 2013

August, 2013

−

Rev. 11

Publication Order Number:

UC3844B/D

UC3844BD1G Related Products

	UC3844BD1G	UC3844BVD1R2G	UC3844BVDG	UC2845BDG	UC3844BVNG	UC3845BDG	UC3845BVDG	UC3844BVD1G
Description	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max	Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max
Brand Name	ON Semiconductor	ON Semiconductor	ON Semiconductor	ON Semiconductor	ON Semiconductor	ON Semiconductor	ON Semiconductor	ON Semiconductor
Is it lead-free?	Lead free	Lead free	Lead free	Lead free	Lead free	Lead free	Lead free	Lead free
Parts packaging code	SOIC	SOIC	SOIC	SOIC	DIP	SOIC	SOIC	SOIC
package instruction	SOP, SOP8,.25	SOP, SOP8,.25	SOP, SOP14,.25	SOP, SOP14,.25	DIP, DIP7/8,.3	SOP, SOP14,.25	SOP, SOP14,.25	SOP, SOP8,.25
Contacts	8	8	14	14	8	14	14	8
Manufacturer packaging code	751-07	751-07	751A-03	751A-03	626-05	751A-03	751A-03	751-07
Reach Compliance Code	compliant	compliant	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	25 V	25 V	25 V	25 V	25 V	25 V	25 V	25 V
Minimum input voltage	12 V	12 V	12 V	12 V	12 V	12 V	12 V	12 V
Nominal input voltage	15 V	15 V	15 V	15 V	15 V	15 V	15 V	15 V
JESD-30 code	R-PDSO-G8	R-PDSO-G8	R-PDSO-G14	R-PDSO-G14	R-PDIP-T8	R-PDSO-G14	R-PDSO-G14	R-PDSO-G8
JESD-609 code	e3	e3	e3	e3	e3	e3	e3	e3
length	4.9 mm	4.9 mm	8.65 mm	8.65 mm	9.78 mm	8.65 mm	8.65 mm	4.9 mm
Number of functions	1	1	1	1	1	1	1	1
Number of terminals	8	8	14	14	8	14	14	8
Maximum operating temperature	70 °C	105 °C	105 °C	85 °C	105 °C	70 °C	105 °C	105 °C
Minimum operating temperature	-	-40 °C	-40 °C	-25 °C	-40 °C	-	-40 °C	-40 °C
Maximum output current	1 A	1 A	1 A	1 A	1 A	1 A	1 A	1 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	SOP	SOP	SOP	DIP	SOP	SOP	SOP
Encapsulate equivalent code	SOP8,.25	SOP8,.25	SOP14,.25	SOP14,.25	DIP7/8,.3	SOP14,.25	SOP14,.25	SOP8,.25
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	IN-LINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260	260	260	260	260	260	260	260
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	1.75 mm	1.75 mm	1.75 mm	4.45 mm	1.75 mm	1.75 mm	1.75 mm
surface mount	YES	YES	YES	YES	NO	YES	YES	YES
Switch configuration	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE
Maximum switching frequency	275 kHz	275 kHz	275 kHz	275 kHz	275 kHz	275 kHz	275 kHz	275 kHz
technology	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR
Temperature level	COMMERCIAL	INDUSTRIAL	INDUSTRIAL	OTHER	INDUSTRIAL	COMMERCIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	Tin (Sn)	Tin (Sn)	Tin (Sn)	Tin (Sn)	Tin (Sn)	Tin (Sn)	Tin (Sn)	Tin (Sn)
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	THROUGH-HOLE	GULL WING	GULL WING	GULL WING
Terminal pitch	1.27 mm	1.27 mm	1.27 mm	1.27 mm	2.54 mm	1.27 mm	1.27 mm	1.27 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	40	40	40	40	40	40	40	40
width	3.9 mm	3.9 mm	3.9 mm	3.9 mm	7.62 mm	3.9 mm	3.9 mm	3.9 mm
Factory Lead Time	1 week	-	1 week	1 week	1 week	2 weeks	-	2 weeks
Humidity sensitivity level	1	1	1	1	-	1	1	1
Base Number Matches	1	1	1	1	1	1	1	-

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