Product Details
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DESCRIPTION The UC384xA family of control ICs 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 a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, 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 UC3842A and UC3844A have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843A and UC3845A are 8.5 V and 7.9V. The UC3842A and UC3843A can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844A and UC3845A by the addition of an internal toggle flip flop which blanks the output off every other clock cycle. ■ TRIMMED OSCILLATOR DISCHARGE CURRENT ■ CURRENT MODE OPERATION TO 500kHz ■ AUTOMATIC FEED FORWARD COMPENSATION ■ LATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITING ■ INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT ■ HIGH CURRENT TOTEM POLE OUTPUT ■ UNDERVOLTAGE LOCKOUT WITH HYSTERESIS ■ LOW START-UP CURRENT (< 0.5mA) ■ DOUBLE PULSE SUPPRESSION |
Product Description
| Type# | description |
| ANSC PART# | ANSC- UC2844AN |
| category | Integrated Circuits (ICs) |
| Power Management (PMIC) | |
| Power Supply Controllers, Monitors | |
| Manufacturer | Original |
| Series | UCx84xA |
| Packaging | Tube |
| Part Status | Active |
| Applications | PWM Controller |
| Voltage - Input | -0.3V ~ 6.3V |
| Voltage - Supply | 10V ~ 30V |
| Current - Supply | 11 mA |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole |
| Package / Case | 8-DIP (0.300", 7.62mm) |
| Supplier Device Package | 8-PDIP |
| Base Product Number | UC2844 |
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