UC3844D8TR
Power Management
Technical Specifications
| Type | Description |
|---|---|
| Output Voltage | 5 V |
| Output Current | 200 mA |
| Function | Slope compensation;Under-voltage lockout;Under Voltage Protection |
| Duty Cycle(Max) | 50% |
| Feedback System | Secondary-Side Feedback |
| Pd W | - |
| Type | Description |
|---|---|
| Switching Freq Hz | 100kHz~500kHz |
| Operating Temperature | 0°C~+70°C |
| Supply Voltage | 12V~28V |
| Topology | Flyback |
| Package / Case | SOIC-8 |
Product Introduction
The UCx84x series control ICs provide the features necessary to implement off-line or DC-DC fixed-frequency current-mode control schemes with a minimum number of external components. Internally implemented circuits include undervoltage lockout (UVLO) — characterized by a startup current of less than 1mA — and a precision reference for trimming accuracy at the error amplifier. Additional internal circuitry includes logic for latched operation, a PWM comparator for current-limit control, and a totem-pole output stage designed to source or sink high peak currents. When in the off state, the output stage — suitable for driving N-channel MOSFETs — is held low.
The UCx84x series offers a variety of package options, temperature range options, maximum duty cycle selections, turn-on and turn-off thresholds, and hysteresis range selections. Devices with higher turn-on or turn-off hysteresis are ideal for off-line power supplies, while devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for an operating temperature range of -55°C to 125°C, the UC284x series is specified for -40°C to 85°C, and the UC384x series is specified for 0°C to 70°C.
Features
- Optimized for off-line and DC-DC converters
- Low startup current (< 1mA)
- Automatic feedforward compensation
- Pulse-by-pulse current limiting
- Enhanced load response characteristics
- Undervoltage lockout with hysteresis
- Double pulse suppression
- High-current totem pole output
- Internally trimmed bandgap reference
- Operating frequency up to 500kHz
- Error amplifier with low output impedance
Applications
- Switching regulator with arbitrary polarity
- Transformer-coupled DC-DC converter
Datasheet
Alternative Parts
Common UC3844D8TR alternatives overseas buyers search for:
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| CNHTS | 8542399000 |
| USHTS | 8542390001 |
| TARIC | 8542399000 |
| Type | Details |
|---|---|
| CAHTS | 8542390000 |
| BRHTS | 85423999 |
| INHTS | 85423900 |
| MXHTS | 8542.39.99 |
Sourcing Information
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