NCP1252ADR2G
Power Management
Technical Specifications
| Type | Description |
|---|---|
| Voltage - Breakdown | - |
| Duty Cycle(Max) | 48% |
| Working Mode | PWM Modulation |
| Feedback System | Secondary-Side Feedback |
| Operating Temperature | -25°C~+125°C |
| Output Current | 650 mA |
| Switching Freq Hz | 500 kHz |
| Type | Description |
|---|---|
| Pd W | - |
| Supply Voltage | 9V~28V |
| Features | Adjustable soft-start;Brown-in/Brown-out detection;EMI optimization (spread spectrum);Leading edge blanking;Slope compensation;Under-voltage lockout;Short Circuit Protection;Over Current Protection;Under Voltage Protection |
| Topology | Flyback;Forward |
| Output Voltage | - |
| Package / Case | SOIC-8 |
Product Introduction
The NCP1252 hosts a high−performance current−mode controller specifically developed to drive power supplies designed for the ATX and the adapter market:
- Current Mode operation: implementing peak current−mode control topology, the circuit offers UC384X−like features to build rugged power supplies.
- Adjustable switching frequency: a resistor to ground precisely sets the switching frequency between 50 kHz and a maximum of 500 kHz. There is no synchronization capability.
- Internal frequency jittering: Frequency jittering softens the EMI signature by spreading out peak energy within a band ±5% from the center frequency.
- Wide Vcc excursion: the controller allows operation up to 28 V continuously and accepts transient voltage up to 30 V during 10 ms with Ivcc < 20 mA
- Gate drive clamping: a lot of power MOSFETs do not allow their driving voltage to exceed 20 V. The controller includes a low−loss clamping voltage which prevents the gate from going beyond 15 V typical.
- Low startup−current: reaching a low no−load standby power represents a difficult exercise when the controller requires an external, lossy, resistor connected to the bulk capacitor. The start−up current is guaranteed to be less than 100 μA maximum, helping the designer to reach a low standby power level.
- Short−circuit protection: by monitoring the CS pin voltage when it exceeds 1 V (maximum peak current), the controller detects a fault and starts an internal digital timer.
Features
- Peak Current Mode Control
- Adjustable Switching Frequency up to 500 kHz
- Jittering Frequency ±5% of the Switching Frequency
- Latched Primary Over Current Protection with 10 ms Fixed Delay
- Delay Extended to 150 ms in E Version
- Delayed Operation Upon Start−up via an Internal Fixed Timer (A, B and C versions only)
- Adjustable Soft−start Timer
- Auto−recovery Brown−Out Detection
- UC384X−like UVLO Thresholds
- Vcc Range from 9 V to 28 V with Auto−recovery UVLO
- Internal 160 ns Leading Edge Blanking
- Adjustable Internal Ramp Compensation
- +500 mA - 800 mA Source / Sink Capability
- Maximum 50% Duty Cycle: A Version
- Maximum 80% Duty Cycle: B Version
- Maximum 65% Duty Cycle: C Version
- Maximum 47.5% Duty Cycle: D & E Versions
- Ready for Updated No Load Regulation Specifications
- SOIC−8 and PDIP−8 Packages
- These are Pb −Free Devices
Applications
- Power Supplies for PC Silver Boxes, Games Adapter...
- Flyback and Forward Converter
Datasheet
Alternative Parts
Common NCP1252ADR2G 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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