LED6000
3 A, 61 V monolithic current source with dimming capability
Datasheet
-
production data
Applications
HTSSOP16 (R
TH
= 40
°C)
HB LED driving applications
Halogen bulb replacement
Features
Up to 3 A DC output current
4.5 V to 61 V operating input voltage
R
DS,ON
= 250 m typ.
Adjustable f
SW
(250 kHz - 1.5 MHz)
Dimming function with dedicated pin
Low I
Q
shutdown (10 µA typ. from VIN)
Low I
Q
operating (2.4 mA typ.)
± 3% output current accuracy
Synchronization
Enable with dedicated pin
Adjustable soft-start time
Adjustable current limitation
Low dropout operation (12 µs max.)
VBIAS improves efficiency at light-load
Output voltage sequencing
Auto recovery thermal shutdown
MLCC output capacitor
Description
The LED6000 is a step-down monolithic switching
regulator designed to source up to 3 A DC current
for high power LED driving. The 250 mV typical
RSENSE voltage drop enhances the efficiency.
Digital dimming is implemented by driving the
dedicated DIM pin.
The adjustable current limitation, designed to
select the inductor RMS in accordance with the
nominal output LED current, and the adjustability
of the switching frequency allow the size of the
application to be compact. The embedded
switchover feature on the VBIAS pin maximizes
efficiency. Multiple devices can be synchronized
by sharing the SYNCH pin to prevent beating
noise in low-noise applications, and to reduce the
input current RMS value.
The device is fully protected against overheating,
overcurrent and output short-circuit.
The LED6000 is available in an HTSSOP16
exposed pad package.
Figure 1. Application schematic
May 2015
This is information on a product in full production.
DocID027777 Rev 2
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www.st.com
Contents
LED6000
Contents
1
2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
2.2
2.3
2.4
2.5
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1
4.2
4.3
4.4
4.5
4.6
4.7
Oscillator and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Digital dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Error amplifier and light-load management . . . . . . . . . . . . . . . . . . . . . . . 19
Low VIN operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5
Application notes - step-down conversion . . . . . . . . . . . . . . . . . . . . . . 24
5.1
5.2
5.3
5.4
5.5
5.6
Input capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Output capacitor and inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Compensation strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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Contents
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Application notes - alternative topologies . . . . . . . . . . . . . . . . . . . . . . 35
6.1
6.2
6.3
6.4
Inverting buck-boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Positive buck-boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Floating boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Compensation strategy for alternative topologies . . . . . . . . . . . . . . . . . . 44
7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
HTSSOP16 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8
9
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
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Block diagram
LED6000
1
Block diagram
Figure 2. Block diagram
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DocID027777 Rev 2
LED6000
Pin settings
2
2.1
Pin settings
Pin connection
Figure 3. Pin connection (top view)
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