KA3842/43/44/45
Inv № 59
Current Mode PWM Controller
July 1995 - revised July 2002
DESCRIPTION
KA3842/43/44/45 are fixed frequency current mode PWM
controller.
They are specially designed for OFF−Line and DC to DC converter applications with a minimal external components.
Internally implemented circuits include a trimmed
oscillator for precise duty cycle control, a temperature compensated reference, high gain
error amplifier, current sensing comparator, and a high current totempole output ideally
suited for driving a power
MOSFET.
Protection circuitry includes built under
voltage lockout
and current limiting.
The UC3842A(AM) and UC3844A(AM) have UVLO thresholds of 16 V (on) and 10 V (...