The GM384x series and GM38C4x series (Bi-CMOS devices) of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components.
Some of the internally implemented circuits are an under-voltage-lock-out (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input.
Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control) with maximum frequency of 500KHZ, and a totem-pole output stage designed to source or sink high-peak current.
The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
Application:
Power Supplier
Mother-board
Monitor Power Supply
Power Switching
Package Types:
SOP-8, DIP-8 Part No.Max. Vin (V)
UVLO Threshold (On/ Off)
Start - Up Current
Duty Cycle (Typ)(%)
Frequency Max. (kHz)
Comments
GM3842/34/44/453016/100.17mA97500PWM ControllerGM38C42/43/44/451814.5/ 950µA96>=500Bi-CMOS PWM Controller
Korea (South))
