HT3402S datasheet(5/11 Pages) HOTCHIP

5 / 11 page

HT3402S

5/11

40V/2A Constant Voltage & Constant Current Buck Converter IC

www.hotchip.com.cn

Ver1.1

Load Current Limit Programming



The constant current ICHG is controlled by a sensing resistor connected between Inductor and Output.

The Voltage- drop of the sensing resistor (RSEN) is internally regulated to 30mV, which sets the current

flowing through RSEN. For better accuracy, a 2% or more accurate Resistor is recommended. Table 1

shows several typical 1% RSEN values:

Table 1

ICHG(mA)

RSEN(mΩ)

2000

1000



For other constant current values, RSEN can be determined by the following equation

out

sen



Pin Configuration

Name

Pin #

Function Description

VIN

Power Supply Input

VCABLE

Connect a suitable resistor to the compensation voltage and

improve the output power which the cable wasted.

Set this pin sets float to turn off cable compensation function.

SEN

Output Voltage feedback

VOUT

Output power supply to back- end devices.Note1

GND

Ground of IC

GND

Ground of IC

SW Output.

Note1: VOUT can be programmed to compensate the drop- out voltage from longer cable.

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