UC3842A(Old_V) Просмотр технического описания (PDF) - Unisonic Technologies
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UC3842A Datasheet PDF : 7 Pages
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UTC UC3842A / 3843A LINEAR INTEGRATED CIRCUIT
PARAMETER
Minimum Duty Cycle
Total Standby Current
SYMBOL
D(MIN)
TEST CONDITIONS
MIN TYP MAX UNIT
0
%
Start-up Current
Operating Supply Current
Vcc Zener Voltage
IST
ICC(opr)
Vz
Vpin 2=Vpin 3=0V
Icc=25mA
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:
A=
∆Vpin 1
∆Vpin 3
; 0<=Vpin3<=0.8V
note 5:Adjust Vcc above the start threshold before setting at 15V.
0.12 0.3 mA
11
17 mA
34
V
OPEN-LOOP LABORATORY TEST FIXTURE
RT
1
8
Vref
A
Vcc
Error Amp
Adjust
2
3
5kΩ
4
CT
7
1kΩ
/ 1W
6
OUTPUT
5
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 5kΩ potentio-meter are used
to sample the oscillator waveform and apply an adjustable Ramp to Pin 3.
UNDER-VOLTAGE LOCKOUT
Vcc
7
ON/OFF Command
to rest of IC
Icc
<15mA
Von=16V
Voff=10V
<1mA
Voff
Von
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.
UTC
UNISONIC TECHNOLOGIES CO., LTD. 3
QW-R103-002,A
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