TD3842A
DESCRIPTION
The TD3842A / 3843A/384 4A/3845A are fixed frequency current-mode PWM controller. They are specially designed for Off
- Line and DC-to-DC converter applications with minimum external ponents. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature pensated reference, high gain error amplifier. current sensing parator, and a high current totempole output Ideally suited for driving a power MOSFET. Protection circuity Includes built in under-voltage lockout and current limiting. The TD3842A and TD3844A have UVLO thresholds of 16V (on) and 10V (off) The TD 3843A and TD3845A are 8.4V (on) and 7.6V (off) The TD3842A and TD3843A can operate within 100% duty cycle. The TD3844A and TD3845A can operate with 50% duty cycle. FEATURES
- Low Start Up Current
- Maximum Duty Clamp
- UVLO With Hysteresis
- Operating Frequency Up To 500KHz
SOP-8
DIP-8
BLOCK DIAGRAM
.
Data Shee
Note 1: Toggle flip flop us ed only in 3844A a nd 3845A.
PIN...
