NCP1253: PWM Controller, Current Mode, for Offline Power Supplies
The NCP1253 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back it's switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current. To avoid sub harmonic oscillations in CCM operation, adjustable slope compensation is available via the series inclusion of a simple resistor in the current sense signal. Besides the auto-recovery timer-based short-circuit protection, an Over Voltage Protection on the Vcc pin protects the whole circuitry in case of optocoupler destruction or adverse open loop operation.
Features- Frequency Foldback down to 26 kHz and Skip-Cycle in Light Load
- Internal Ramp Compensation
- Frequency Jittering in Normal and Frequency Foldback modes
- Over Voltage Protection (OVP) monitoring on the Vcc pin
- Timer-based Auto-Recovery or Latched Short-Circuit Protection
| Benefits- Improved efficiency across the load range
- Reduces the number of external components
- Low EMI signature
- Protects against output over voltage conditions without any added components
- Protection against fault conditions
|
Applications- Offline Adapters
- AC-DC converters
| End Products- Set-top Boxes
- Printers
- Notebooks and Netbooks
|
Design & Development Tools (1)
Package Drawings (1)
| Document Title | Document ID/Size | Revision |
|---|
| TSOP-6 | 318G-02 (64.1kB) | V |
Data Sheets (1)
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NCP1253ASN100T1G | Active | Pb-free
Halide free | TSOP-6 | 318G-02 | 1 | Tape and Reel | 3000 | $0.15 |
| NCP1253ASN65T1G | Active | Pb-free
Halide free | TSOP-6 | 318G-02 | 1 | Tape and Reel | 3000 | $0.15 |
| NCP1253BSN100T1G | Active | Pb-free
Halide free | TSOP-6 | 318G-02 | 1 | Tape and Reel | 3000 | $0.15 |
| NCP1253BSN65T1G | Active | Pb-free
Halide free | TSOP-6 | 318G-02 | 1 | Tape and Reel | 3000 | $0.15 |
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) |
|---|
| NCP1253ASN100T1G | Flyback | Current Mode | 100 | Yes | 8.8 | Yes | Yes | Yes | 28 | 300 / 500 |
| NCP1253ASN65T1G | Flyback | Current Mode | 65 | Yes | 8.8 | Yes | Yes | Yes | 28 | 300 / 500 |
| NCP1253BSN100T1G | Flyback | Current Mode | 100 | Yes | 8.8 | Yes | No | Yes | 28 | 300 / 500 |
| NCP1253BSN65T1G | Flyback | Current Mode | 65 | Yes | 8.8 | Yes | No | Yes | 28 | 300 / 500 |
