TPS54200 Datasheet, PDF (1/35 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
SLUSCO8 – NOVEMBER 2016
TPS54200 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
• Thermal Shutdown
• SOT23-6 Package
2 Applications
• General Purpose LED Driver
• Architecture Lighting
• Industrial and Commercial Illumination
3 Description
The TPS54200 is a 1.5-A synchronous buck WLED
driver up to 28-V input. Current mode operation
provides fast transient response and eases loop
stabilization.
By integrating the MOSFETs and employing the
SOT23-6 package, TPS54200 achieves the high-
power density and offers a small footprint on the
PCB.
The TPS54200 implements analog dimming by
changing internal reference voltage proportional to
the duty cycle of PWM signal input in analog dimming
mode. This device also support 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 includes LED open and short
protection, sense resistor open and short protection,
and device thermal protection. To protect the LED
from over-current damage, the driver shuts down and
is latched once over current is detected.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54200
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
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.