QW-R103-002,B

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Maximum Duty Cycle

95

97

100

%

Minimum Duty Cycle

0

%

Total Standby Current

Start-up Current

0.12

0.3

mA

Operating Supply Current

Vpin 2=Vpin 3=0V

11

17

mA

Vcc Zener Voltage

Vz

Icc=25mA

34

V

note 2:These parameters, although guaranteed ,are not 100% tested in production.

note 3:Parameters measured at trip point of latch with Vpin 2=0.

note 4:Gain defined as:

∆Vpin 1

∆Vpin 3

A=

; 0<=Vpin3<=0.8V

note 5:Adjust Vcc above the start threshold before setting at 15V.

OPEN-LOOP LABORATORY TEST FIXTURE

1

2

8

7

3

6

4

5

A

Vref

Vcc

1k

Ω

/ 1W

CT

RT

5k

Ω

Error Amp

Adjust

OUTPUT

High peak current associated with capacity loads necessitate careful grounding techniques. Timing and bypass

capacitors should be connected close to pin 5 in single point GND. The transistor and 5k

Ω potentio-meter are used

to sample the oscillator waveform and apply an adjustable Ramp to Pin 3.

UNDER-VOLTAGE LOCKOUT

7

Vcc

Von=16V

Voff=10V

ON/OFF Command

to rest of IC

Von

Voff

<1mA

<15mA

Icc

Vcc

During Under-Voltage Lockout, the output driver is biased to a high impedance state. Pin 6 should be shunt to

GND with a bleeder resistor to prevent activating the power switch with output leakage currents.