CS8128YD8 Просмотр технического описания (PDF) - Cherry semiconductor

Номер в каталоге

Компоненты Описание

Список матч

CS8128YD8

5V Linear Controller/Driver

Cherry semiconductor 

VOUT

VRTH

VRTL

VRH

RESET Circuit Waveform

RESET

(3)

VRL

Delay

VDTC

VDTD

VDH

(1)

(2)

TD

(2)

(1) = No Delay Capacitor

(2) = With Delay Capacitor

(3) = Max: RESET Voltage (1.0V)

VDIS

RESET Circuit Functional Description

The CS8128 RESET function is very precise, has hysteresis

on both the RESET and Delay comparators, a latching

Delay capacitor discharge circuit, and operation down to

1V.

The reset circuit output is an open collector type with ON

and OFF parameters as specified. The reset output NPN

transistor is controlled by the Low Voltage Inhibit and

Reset Delay circuits (see Block Diagram).

Low Voltage Inhibit Circuit

This circuit monitors output voltage, and when output

voltage is below VRTL, causes the reset output transistor to

be in the ON (saturation) state. When the output voltage is

above VRTH, this circuit permits the reset output transistor

to go into the OFF state if allowed by the reset Delay cir-

cuit.

RESET Delay Circuit

This circuit provides a programmable (by external capaci-

tor) delay on the RESET output lead. The Delay lead pro-

vides source current to the external delay capacitor only

when the Low Voltage Inhibit circuit indicates that output

voltage is above VRTH. Otherwise, the Delay lead sinks

current to ground (used to discharge the Delay capacitor).

The discharge current is latched ON when the output volt-

age falls below VRTL. The Delay capacitor is fully dis-

charged anytime the output voltage falls out of regulation,

even for a short period of time. This feature ensures a con-

trolled RESET pulse is generated following the detection

of an error condition. The circuit allows the RESET out-

put transistor to go to the OFF (open) state only when the

voltage on the Delay lead is higher than VDTC.

4

Share Link: