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Documents TPS92640, TPS92641
SNVS902A – OCTOBER 2012 – REVISED OCTOBER 2015 TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers
1 Features 3 Description The TPS92640 and TPS92641 devices are highvoltage, synchronous NFET controllers for buckcurrent regulators. Output current regulation is based
on valley current-mode operation using a controlled
on-time architecture. This control method eases the
design of loop compensation while maintaining nearly
constant switching frequency. The TPS92640 and
TPS92641 devices include a high-voltage start-up
regulator that operates over a wide input range of 7 V
to 85 V. The PWM controller is designed for high
speed capability, including an oscillator frequency
range up to 1 MHz. The deadtime between high side
and low side gate driver is optimized to provide very
high efficiency over a wide input operating voltage
and output power range. The TPS92640 and
TPS92641 devices accept both analog and PWM
input signals, resulting in exceptional dimming control
range. Linear response characteristics between input …
