DT

1

2

3

4

RT

OC

SS

GD1

VCC

GND

GD2

8

7

6

5

TPS92023

SLUSBH3 – JUNE 2013

www.ti.com

DEVICE INFORMATION

TPS92023 (Top View)

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

NO.

I/O

Sets the dead time of high-side and low-side switch driving signals. Connect a resistor to ground. With internal

2.25-V voltage reference, the current flowing through the resistor sets the dead time. To prevent shoot through

DT

1

I

when this pin is accidentally short to ground, the minimum dead time is set to 120 ns. Any dead time setting

less than 120 ns defaults to 120-ns dead time.

GD1

8

O

High-side and low-side switch gate driver. Connect gate driver transformer primary side to these two pins to

drive the half bridge.

GD2

5

O

GND

6

-

Ground.

Overcurrent protection. When the voltage on this pin is above 1 V, gate driver signals are actively pulled low.

OC

3

I

After the voltage falls below 0.6 V, the gate driver signal recovers with soft start. When OC pin voltage is

above 2 V, the device is latched off. Bringing VCC below UVLO level resets the overcurrent latch off.

The current flowing out of this pin sets the frequency of the gate driver signals. Connect the opto-coupler

collector to this pin to control the switching frequency for regulation purpose. Parallel a resistor to ground to

RT

2

I

set the minimum current flowing out of the pin and set the minimum switching frequency. To set the maximum

switching frequency limiting, place a resistor in series with the opto-coupler transistor. This resistor sets the

maximum current flowing out of the pin and limits the maximum switching frequency.

Soft-start. This pin sets the soft-start time of the system. Connect a capacitor to ground. Pulling this pin below

SS

4

I

1 V disables the device to allow easy ON/OFF control. The soft-start function is enabled after all fault

conditions, including bias supply OV, UVLO, overcurrent protection and over-temperature protection.

Bias supply. Connect this pin to a power supply less than 20 V. Place a 1-

μF capacitor in parallel to ground to

VCC

7

-

filter out noise.

6

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