UC3842A-D08-T UTC [Unisonic Technologies], UC3842A-D08-T Datasheet - Page 5

• Manufacturer Part Number: UC3842A-D08-T
• Description: CURRENT MODE PWM CONTROL CIRCUITS
• Manufacturer: UTC [Unisonic Technologies]

UC3842A/3843A
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.
GND with a bleeder resistor to prevent activating the power switch with output leakage currents.
High peak current associated with capacity loads necessitate careful grounding techniques. Timing and bypass
During Under-Voltage Lockout, the output driver is biased to a high impedance state. Pin 6 should be shunt to
OPEN-LOOP LABORATORY TEST FIXTURE
UNDER-VOLTAGE LOCKOUT
ERROR AMPLIFIER CONFIGURATION
Adjust
Error
Vcc
Amp
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7
5kΩ
RT
Von=16V
Voff=10V
CT
Error amplifier can source or sink up to 0.5mA
Zi
ON/OFF Command
to rest of IC
1
2
3
4
Zf
2
1
<15mA
<1mA
2.5V
Icc
8
7
6
5
LINEAR INTEGRATED CIRCUIT
0.5mA
Voff
A
/ 1W
1kΩ
Von
OUTPUT
V
Vcc
REF
Vcc
QW-R103-002,D
5 of 9