Step-up DC/DC controller built in 4-channel sink driver
TOSHIBA BiCD Integrated Circuit Silicon Monolithic
TB62771FTG
Step-up DC/DC controller built in 4-channel sink driver fo...
Description
TOSHIBA BiCD Integrated Circuit Silicon Monolithic
TB62771FTG
Step-up DC/DC controller built in 4-channel sink driver for white LED
1. General description
TB62771FTG is a large-current LED driver IC incorporating DC/DC controller for high-power LED systems.
This IC can drive high-intensity and large-current LED connected to 4 constant current sinks.
This IC is for driving backlight of white LEDs for large LCD.
TB62771FTG
2. Features
Input voltage range : 4.75 V to 40 V
Weight : 0.03 g (TYP.)
Built in current mode DC/DC controller
Switching frequency: Set by the resistance connected to RT terminal (200 kHz to 2.0 MHz), Synchronization with external clock
4ch constant current driver: Sink current 20 mA to 150 mA Current accuracy +/- 2% (ILED = 100 mA, between channels)
Control voltage for minimum OUT terminal 0.5 V (ILED = 150 mA)
Dimming control: Input PWM range 100 Hz to 30 kHz Minimum pulse width of input PWM 330 ns
Detection circuit: VIN under voltage lockout (UVLO(VIN)) VCC under voltage lockout (UVLO(VCC)) LED open detection LED short detection (Set by the resistance connected to RSDT terminal) Built in thermal shutdown circuit Overvoltage detection (set by external resistance)
Soft start function
Output delay function
Shutdown consumption current 40 µA (max)
IC package:P-WQFN20-0404-0.50-002
1 2013-05-23
3. Block Diagram
TB62771FTG
PGND1 NDRV DRV
CS RT COMP
Step-up Controller
OSC
Error Amplifier
OVP
Over Voltage Detector
Unused ...
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