NCP1252: PWM Controller, Current Mode, for Forward and Flyback Applications
The NCP1252 controller offers everything needed to build cost effective and reliable ac-dc switching supplies dedicated to ATX power supplies or any forward application. Thanks to the use of an internally fixed timer, NCP1252 detects an output overload without relying on the auxiliary Vcc. A Brown-Out input offers protection against low input voltages and improves the converter safety. Finally, the SOIC-8 package saves PCB space and represents a solution of choice in cost sensitive project.
Features- Peak current mode control
- Adjustable switching frequency
- Latched primary overcurrent protection with 10 ms fixed delay
- Adjustable soft start timer
- Auto recovery brown out detection
- Internal 160 ns leading edge blanking
- Frequency jittering
- Adjustable internal ramp compensation
- +500 mA / -800 mA Source/Sink current driver capability
- Skip cycle operation in light/no load operation
- SOIC-8 package
- Extended Vcc range up to 28 V with auto recovery UVLO
| Benefits- Help to build rugged power supplies
- High flexibility on the switching frequency
- Allow temporary over load/current and latch permanent fault
- Flexibility on the soft start duration
- Resume the power supply operation after a brown out detection
- Noise immunity improved
- Improve the EMI signature by spreading the noise
- Save external components
- No need of external power MOSFET driver
- Save dummy load
- Save PCB area
|
Applications- Power supplies for PC silver boxes
- Ac-dc adapter converter
- Game Adapter
- Flyback and Forward Application
| End Products |
Design & Development Tools (1)
Simulation Models (1)
| Document Title | Document ID/Size | Revision | Revision Date |
|---|
| NCP1252 Pspice model | NCP1252 SPICE MODEL (134.0kB) | 0 | |
Data Sheets (1)
Application Notes (3)
Package Drawings (2)
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NCP1252ADR2G | Active | Pb-free
Halide free | SOIC-8 | 751-07 | 1 | Tape and Reel | 2500 | $0.32 |
| NCP1252APG | Active | Pb-free
Halide free | PDIP-8 | 626-05 | NA | Tube | 50 | $0.34 |
| NCP1252BDR2G | Active | Pb-free
Halide free | SOIC-8 | 751-07 | 1 | Tape and Reel | 2500 | $0.32 |
| NCP1252CDR2G | Active | Pb-free
Halide free | SOIC-8 | 751-07 | 1 | Tape and Reel | 2500 | $0.32 |
| NCP1252DDR2G | Active | Pb-free
Halide free | SOIC-8 | 751-07 | 1 | Tape and Reel | 2500 | $0.32 |
| NCP1252EDR2G | Active | Pb-free
Halide free | SOIC-8 | 751-07 | 1 | Tape and Reel | 2500 | $0.32 |
Specifications
| Product | Topology | Control Mode | fsw Typ (kHz) | Stand-by Mode | UVLO (V) | Short Circuit Protection | Latch | Soft Start | VCC Max (V) | Drive Cap. (mA) |
|---|
| NCP1252ADR2G | Flyback
Forward | Current Mode | Up to 500 | Yes | 9 to 10 | Yes | Yes | Yes | 28 | 500 / 800 |
| NCP1252APG | Flyback
Forward | Current Mode | Up to 500 | Yes | 9 to 10 | Yes | Yes | Yes | 28 | 500 / 800 |
| NCP1252BDR2G | Flyback
Forward | Current Mode | Up to 500 | Yes | 9 to 10 | Yes | Yes | Yes | 28 | 500 / 800 |
| NCP1252CDR2G | Forward
Flyback | Current Mode | Up to 500 | Yes | 9 to 10 | Yes | Yes | Yes | 28 | 500 / 800 |
| NCP1252DDR2G | Forward
Flyback | Current Mode | Up to 500 | Yes | 9 to 10 | Yes | Yes | Yes | 28 | 500 / 800 |
| NCP1252EDR2G | Flyback
Forward | Current Mode | Up to 500 | Yes | 9 to 10 | Yes | Yes | Yes | 28 | 500 / 800 |
