TPS54200_17 Datasheet, PDF (1/38 Pages) Texas Instruments – 4.5-V to 28-V Input Voltage, 1.5-A Output Current, Synchronous Buck WLED Driver

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TPS54200, TPS54201
SLUSCO8A – NOVEMBER 2016 – REVISED MARCH 2017
TPS54200, TPS54201 4.5-V to 28-V Input Voltage, 1.5-A Output Current,
Synchronous Buck WLED Driver
1 Features
•1 4.5-V to 28-V Wide Input Range
• Integrated 150-mΩ and 70-mΩ MOSFETs for 1.5-
A, Continuous Output Current
• Low, 2-μA Shutdown Current
• Fixed 600-kHz Frequency
• Peak Current Mode with Internal Compensation
• 200-mV and 100-mV Sense Voltage During
Analog and PWM Dimming Mode
• Precision Analog Dimming by PWM Input
• LED Open and Short Protection
• Sense Resistor Open and Short Protection
• Shutdown-and-latch Mode Protection (TPS54200)
• Hiccup Mode Protection (TPS54201)
• Thermal Shutdown
• SOT23-6 Package
2 Applications
• General Purpose LED Driver
• Architecture Lighting
• Industrial and Commercial Illumination
3 Description
The TPS54200 and TPS54201 are 1.5-A
synchronous buck WLED drivers with 28-V maximum
input voltage. Current mode operation provides fast
transient response and eases loop stabilization.
By integrating the MOSFETs and employing the
SOT23-6 package, TPS54200 and TPS54201
provide high-power density and only require a small
footprint on the PCB.
The TPS54200 and TPS54201 implement analog
dimming by changing the internal reference voltage
proportional to the duty cycle of the PWM signal input
in analog dimming mode. This device also supports
PWM dimming mode, in which the internal reference
voltage will be halved to 100 mV for higher efficiency.
Cycle-by-cycle current limit in high-side MOSFET
protects the converter in an over-load condition and is
enhanced by a low-side MOSFET freewheeling
current limit which prevents current runaway. There is
a low-side MOSFET sinking current limit to prevent
excessive reverse current. For safety and protection
the TPS54200 and TPS54201 include LED open and
short protection, sense resistor open and short
protection, and device thermal protection. TPS54200
implements shutdown-and-latch mode protection,
while TPS54201 adopts hiccup mode protection.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54200
SOT23(6)
1.6 mm x 2.9 mm
TPS54201
SOT23(6)
1.6 mm x 2.9 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
LO
CBOOT
CO
1 GND BOOT 6
VIN
CIN
2 SW PWM 5
3 VIN
FB 4
PWM Input
RF
CF
RSENSE
Copyright © 2016, Texas Instruments Incorporated
Excellent Deep Dimming in ADIM
6%
5.5%
5%
4.5%
4%
3.5%
Unit 1
3%
Unit 2
Unit 3
2.5%
Unit 4
Unit 5
2%
Unit 6
1.5%
Unit 7
Unit 8
1%
1% 1.5% 2% 2.5% 3% 3.5% 4% 4.5% 5%
PWM duty cycle
D001
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.