HVMDetectionChannel1

TLC5960

D1 G1 S1

D2 G2 S2

MN1

MN2

V

LED

DC/DCConverter

VIN

V

REF

R1

R2

R3

V

HVM

HVM

Logic

Calculation

Routine

Buffer

HVM1

Q

D

C

Sampling

Clock

HVMDetectionChannel2

I

LED

TLC5960

SBVS147 – SEPTEMBER 2010

www.ti.com

THERMAL SHUTDOWN

The TLC5960 includes integrated internal temperature sensors for providing thermal shutdown protection. If an

over-temperature state is detected, the TLC5960 automatically shuts down all the functions, including the internal

low-dropout regulator (LDO). This status is latched until VIN < VPOR, or the EN input signal toggles from high to

low to high.

POWER-ON RESET (POR)

The TLC5960 is equipped with internal power-on reset circuitry. When VIN < 7.0V, the remaining circuit blocks

are all locked to stay in standby mode. This function is also called undervoltage lockout (UVLO). The

specifications for VPOR and VPORHYS are listed in the Electrical Characteristics.

HEADROOM VOLTAGE MONITOR FEEDBACKS (iHVM)

The TLC5960 provides an intelligent feedback mechanism of the headroom voltage information to automatically

adjust the dc/dc converter output voltage. Up to four dc/dc converter outputs can be optimized using the

TLC5960 iHVM buffers; the output levels are automatically adjusted through the internal iHVM mechanism.

Figure 23 shows a basic configuration of one dc/dc converter for a two-channel output (HVM 2CH mode). Only

one additional external resistor is required to modify the dc/dc converter output voltage.

Figure 23. Headroom Voltage Monitor Feedback Mechanism

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