DRV102

4

SBVS009A

www.ti.com

PIN #

NAME

DESCRIPTION

Pin 1

Input

The input is compatible with standard TTL levels. The device output becomes enabled when the input voltage is driven above

the typical switching threshold, 1.7V. Below this level, the output is disabled. With no connection to the pin, the input level rises

to 3.4V. Input current is 20

µA when driven high and 80µA with the input low. The input may be driven to the power supply (V

without damage.

Pin 2

Delay Adjust

This pin sets the duration of the initial 100% duty cycle before the output goes into PWM mode. Leaving this pin floating results

in a delay of approximately 15

µs, which is internally limited by parasitic capacitance. Minimum delay may be reduced to less

than 3

µs by tying the pin to 5V. This pin connects internally to a 3µA current source from V

When the pin voltage is below 3V, the output device is 100% on. The PWM oscillator is not synchronized to the Input (pin 1),

so the first pulse may be extended by any portion of the programmed duty cycle.

Pin 3

Duty Cycle Adjust

Internally, this pin connects to the input of a comparator and a 19k

Ω resistor to ground. It is driven by a 200µA current source

(PWM)

or output of a D/A converter. The active voltage range is from 0.55V to 3.7V to facilitate the use of single-supply control

frequency is a constant 24kHz.

Pin 4

Ground

This pin is electrically connected to the package tab. It must be connected to system ground for the DRV102 to function. It

carries the 6.5mA quiescent current.

Pin 5

This is the power supply pin. Operating range is +8V to +60V.

Pin 6

Out

by low saturation voltage and fast switching transitions. Rise time is less than 250ns, fall time depends on load impedance.

be selected for low forward voltage. The internal clamp diode provides protection but should not be used to conduct load

Pin 7

Flag

Normally high (active low), the Flag signals either an over-temperature, over-current, or under-current fault. The over/under-

current flags are true only when the output is on (constant dc output or the “on” portion of PWM mode). A thermal fault (thermal

shutdown) occurs when the die surface reaches approximately 165

°C and latches until the die cools to 150°C. Its output

requires a pull-up resistor. It can typically sink two milliamps, sufficient to drive a low-current LED.

PIN DESCRIPTIONS

LOGIC BLOCK DIAGRAM

C

D

R

PWM

Input

On

Off

Over/Under Current

DRV102

Flag

Thermal

Shutdown

PWM

23

(2)

1

7

Delay

Load

NOTES: (1) Schottky Power Rectifier for low

power dissipation. (2) Schottky or appropriately

rated silicon diode.

(+8V to +60V)

Gnd

4

Out

6

D

2

D

1

(1)

V

S

5