Overview
The NCP1200P60, produced by onsemi, is a PWM current-mode controller designed for low-power universal off-line supplies. It is housed in either an SOIC-8 or PDIP-8 package, making it ideal for ultra-compact switch-mode power supplies. This controller operates at a fixed frequency of 60 kHz and drives low gate-charge switching devices such as IGBTs or MOSFETs, requiring minimal operating power. The NCP1200P60 simplifies the design of reliable and cost-effective offline converters with features like current-mode control, skip cycle mode for efficiency at light loads, and inherent pulse-by-pulse control. It also includes integrated output short-circuit protection and operates without the need for an auxiliary winding, ensuring functionality even at low output voltages or shorts.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Increasing Level at Which the Current Source Turns-off (VCCOFF) | 10.3 | 11.4 | 12.5 | V |
| VCC Decreasing Level at Which the Current Source Turns-on (VCCON) | 8.8 | 9.8 | 11 | V |
| Internal IC Consumption, No Output Load on Pin 5 (ICC1) | - | 710 | 880 | μA |
| Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 60 kHz (ICC2) | - | 1.2 | 1.4 | mA |
| Oscillation Frequency (fOSC) at 60 kHz Version | 52 | 61 | 70 | kHz |
| Maximum Duty Cycle (Dmax) | 74 | 80 | 87 | % |
| Peak Current Source/Sink Capability | - | 250 | - | mA |
| Internal Pullup Resistor (Rup) | - | 8.0 | - | kΩ |
Key Features
- Fixed frequency operation at 60 kHz
- Current-mode control with skip cycle capability for efficiency at light loads
- Internal output short-circuit protection
- No auxiliary winding operation, ensuring functionality at low output voltages or shorts
- Internal leading edge blanking
- 250 mA peak current source/sink capability
- Built-in frequency jittering for lower EMI
- Direct optocoupler connection
- Internal temperature shutdown
- Pb-free packages available
- Extremely low no-load standby power
Applications
- AC/DC adapters
- Offline battery chargers
- Auxiliary/ancillary power supplies (e.g., for USB, appliances, TVs)
Q & A
- Q: What is the maximum supply voltage supported by the NCP1200P60?
A: The NCP1200P60 can handle a maximum supply voltage of 600V.
- Q: Does the NCP1200P60 feature overcurrent protection?
A: Yes, the NCP1200P60 includes cycle-by-cycle current limiting for overcurrent protection.
- Q: What are the available package types for the NCP1200P60?
A: The NCP1200P60 is available in SOIC-8 and PDIP-8 packages.[
- Q: What is the typical oscillation frequency of the NCP1200P60?
A: The typical oscillation frequency of the NCP1200P60 is 61 kHz.[
- Q: Does the NCP1200P60 have built-in frequency jittering?
A: Yes, the NCP1200P60 features built-in frequency jittering to reduce EMI.[
- Q: What is the maximum duty cycle of the NCP1200P60?
A: The maximum duty cycle of the NCP1200P60 is 87%.[
- Q: Does the NCP1200P60 support direct optocoupler connection?
A: Yes, the NCP1200P60 supports direct optocoupler connection.[
- Q: What is the peak current source/sink capability of the NCP1200P60?
A: The peak current source/sink capability of the NCP1200P60 is 250 mA.[
- Q: Does the NCP1200P60 have internal temperature shutdown?
A: Yes, the NCP1200P60 includes internal temperature shutdown.[
- Q: Are Pb-free packages available for the NCP1200P60?
A: Yes, Pb-free packages are available for the NCP1200P60.[
