UC3842 Current Mode PWM Controller

The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, 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 in the off state.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have UVLO thresholds of 16 VON and 10 VOFF, ideally suited to off-line applications. The corresponding thresholds for the UC1843 and UC1845 are 8.4 V and 7.6 V. The UC1842 and UC1843 can operate to duty cycles approaching 100%. A range of zero to 50% is obtained by the UC1844 and UC1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

Features:

1. Optimized For Off-line and DC-to-DC Converters
2. Low Start-Up Current (<1 mA)
3. Automatic Feed ForwardCompensation
4. Pulse-by-Pulse Current Limiting
5. Enhanced Load Response Characteristics
6. Under-Voltage Lockout With Hysteresis
7. Double Pulse Suppression
8. High Current Totem Pole Output
9. Internally Trimmed Bandgap Reference
10. 500-kHz Operation
11. Low RO Error Amp

 

Package Included:

 

• 2pcs * UC3842 Current Mode PWM Controller