TS19378

Taiwan Semiconductor

Document Number: DS_P0000199

4

Version: B15

TYPICAL APPLICATION CIRCUIT

AC Input Application Circuit

R5

C1

L1

350mA

0.570Ω

70mW

100μF

33μH

750mA

0.266Ω

150mW

220μF

1000mA

0.200Ω

200mW

330μF

APPLICATION INFORMATION

PWM Control

The TS19378 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of

the TS19378, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage

produced by the switching can easily be removed through a filter because the switching frequency remains constant.

Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current

Setting ILED Current

Application circuit item shows the basic application circuit with TS19378 adjustable output version. The external

resistor sets the LED output current according to the following formula:

Resistor select for LED output current setting

R2

350mA

0.57Ω

70mW

750mA

0.266Ω

150mW

1000mA

0.2Ω

200mW

Current Limit

The current limit threshold is setting by the internal circuit.

Compensation

In all LED driver applications. Connecting a resistor (R2) and a capacitor (C7) from COMP pin to GND. Please

refer the application circuit table to design.