Advanced Power

Electronics Corp.

APE1920

ELECTRICAL SPECIFICATIONS(Cont.)

Parameter

SYM

TEST CONDITION

MIN

TYP

MAX

UNITS

MOSFET On-resistance

-

200

280

(Note1)

-

160

220

EN High-level Input Voltage

1-

-

V

EN Low-level Input Voltage

-

-

0.4

V

EN Hysteresis

hys

-

200

-

mV

EN Input Leakage Current

-

0.01

0.1

μA

Maximum Duty Cycle

Duty

85

90

-

%

LX Leakage Current

-

-

10

µA

Thermal Shutdown

-

150

-

Thermal Shutdown Hysteresis

-35

-

Note：Guaranteed by design.

PIN DESCRIPTIONS

PIN SYMBOL

PIN DESCRIPTION

EN

Enable Pin

COMP

Compensation Pin

FB

Feedback Pin

SS

Soft start Pin. Connect a capacitor to GND

LX

Switch Pin.

Power Input Pin

GND

Ground Pin

SGND

Signal Ground

PGND

Power Ground

Frequency select pin. The power switch operates at 680kHz if FREQ is connected

to GND and at 1.2MHz if FREQ is connected to VCC

BLOCK DIAGRAM

FREQ

5

mΩ

VCC

SS

LX

SGND

Control and

Driver Logic

EN

COMP

1.238V

Reference

Soft

Start

Current

Sense

Slope

Compensation

Oscillator

FB

Error Amplifier

Summing

Comparator

Thermal

Shutdown

7uA

Enable/

Disable

PGND

N-MOS

FREQ