Overview
The NCP1252ADR2G is a current mode PWM controller designed by onsemi, specifically tailored for building cost-effective and reliable ac-dc switching supplies. This controller is particularly suited for applications such as ATX power supplies, forward converters, and flyback converters. It features an internally fixed timer for detecting output overloads without relying on the auxiliary Vcc, and includes a Brown-Out input for protection against low input voltages, enhancing converter safety. The SOIC-8 package ensures space efficiency, making it an ideal choice for cost-sensitive projects.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOIC-8 |
| Control Mode | Current Mode |
| Switching Frequency | Up to 500 kHz |
| Stand-by Mode | Yes |
| UVLO (V) | 9 to 10 V |
| Short Circuit Protection | Latched primary overcurrent protection with 10 ms fixed delay |
| Soft Start | Adjustable soft start timer |
| Vcc Max (V) | 28 V |
| Drive Capability (mA) | +500 mA / -800 mA |
| Operating Temperature | -40°C to 150°C (junction temperature) |
Key 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
- Extended Vcc range up to 28 V with auto recovery UVLO
- Internal 160 ns leading edge blanking
- Frequency jittering
- Adjustable internal ramp compensation
- Skip cycle operation in light/no load operation
- +500 mA / -800 mA Source/Sink current driver capability
Applications
- Power supplies for PC silver boxes
- Ac-dc adapter converters
- Game adapters
- Flyback and forward applications
End products include desktop computers and other devices requiring reliable and efficient power supplies.
Q & A
- What is the primary function of the NCP1252ADR2G?
The NCP1252ADR2G is a current mode PWM controller designed for building cost-effective and reliable ac-dc switching supplies. - What package type does the NCP1252ADR2G come in?
The NCP1252ADR2G comes in a SOIC-8 package. - What is the maximum switching frequency of the NCP1252ADR2G?
The maximum switching frequency is up to 500 kHz. - Does the NCP1252ADR2G have short circuit protection?
Yes, it has latched primary overcurrent protection with a 10 ms fixed delay. - What is the maximum Vcc voltage for the NCP1252ADR2G?
The maximum Vcc voltage is 28 V. - What are the key applications of the NCP1252ADR2G?
Key applications include power supplies for PC silver boxes, ac-dc adapter converters, game adapters, and flyback and forward applications. - Does the NCP1252ADR2G support skip cycle operation?
Yes, it supports skip cycle operation in light/no load conditions. - What is the drive capability of the NCP1252ADR2G?
The drive capability is +500 mA / -800 mA. - Does the NCP1252ADR2G have adjustable soft start and ramp compensation?
Yes, it has adjustable soft start timer and internal ramp compensation. - What is the operating temperature range for the NCP1252ADR2G?
The operating temperature range is -40°C to 150°C (junction temperature).
