Overview
The NCP1230D65R2, produced by onsemi, is a current-mode PWM controller designed for medium to high power switched-mode power supplies. It is particularly suited for applications such as notebook adapters, off-line battery chargers, and consumer electronics equipment. This controller integrates all necessary control functionality into a compact 8-pin package (SOIC-8), ensuring low standby power consumption and efficient operation. The NCP1230 features an event management scheme that disables the PFC circuit during standby, significantly reducing no-load power consumption. It also includes a high-voltage startup circuit, internal soft-start, leading edge blanking, and frequency dithering for low EMI, among other key features.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Maximum Voltage on Pin 8 | VDS | -0.3 | - | 500 | V |
| Power Supply Voltage, Pin 6 | VCC | -0.3 | - | 18 | V |
| Drive Output Voltage, Pin 5 | VDV | - | - | 18 | V |
| Drive Current | Io | - | - | 1.0 | A |
| Internal IC Consumption, No Output Load on Pin 6 | ICC1 | 0.6 | 1.1 | 1.8 | mA |
| Soft-Start Period | SS | - | 2.5 | - | ms |
| Temperature Shutdown, Maximum Value | TSD | 150 | 165 | - | °C |
| Oscillation Frequency (65 kHz Version) | fOSC | 55 | 65 | 72 | kHz |
Key Features
- Current-Mode Operation with Internal Ramp Compensation
- Internal High-Voltage Startup Current Source for Loss-Less Startup
- Extremely Low No-Load Standby Power
- Skip-Cycle Capability at Low Peak Currents
- Direct Connection to PFC Controller for Improved No-Load Standby Power
- Internal 2.5 ms Soft-Start
- Internal Leading Edge Blanking
- Latched Primary Overcurrent and Overvoltage Protection
- Short-Circuit Protection Independent of Auxiliary Level
- Internal Frequency Jittering for Improved EMI Signature
Applications
The NCP1230D65R2 is ideal for various applications including:
- Notebook adapters
- Off-line battery chargers
- Consumer electronics equipment
- Set-top boxes
- TV and computer monitors
Q & A
- What is the primary function of the NCP1230D65R2?
The NCP1230D65R2 is a current-mode PWM controller designed for medium to high power switched-mode power supplies.
- What are the key benefits of the high-voltage startup circuit in the NCP1230D65R2?
The high-voltage startup circuit eliminates the need for external startup components and reduces power consumption.
- How does the NCP1230D65R2 manage standby power consumption?
The NCP1230D65R2 features an event management scheme that disables the PFC circuit during standby, significantly reducing no-load power consumption.
- What is the purpose of the internal soft-start feature?
The internal 2.5 ms soft-start feature helps in gradual power-up, preventing inrush currents and ensuring smooth operation.
- How does the NCP1230D65R2 protect against overcurrent and overvoltage conditions?
The controller includes latched primary overcurrent and overvoltage protection, as well as short-circuit protection independent of the auxiliary level.
- What is the significance of internal frequency jittering in the NCP1230D65R2?
Internal frequency jittering improves the EMI signature of the power supply, reducing electromagnetic interference.
- What are the typical operating voltage ranges for the NCP1230D65R2?
The controller operates with a power supply voltage (VCC) range of 7.0 V to 18 V.
- How does the skip-cycle capability work in the NCP1230D65R2?
The skip-cycle capability prevents the current from decreasing below 25% of the maximum peak current, reducing acoustic noise and power consumption at light loads.
- What is the role of the PFC_Vcc output pin in the NCP1230D65R2?
The PFC_Vcc output pin provides the bias supply power for a Power Factor Correction controller or other logic, and is enabled when the output of the power supply is up and in regulation.
- How does the temperature shutdown feature work in the NCP1230D65R2?
The controller has a temperature shutdown feature that activates at a maximum temperature of 165°C, with a hysteresis of 25°C.
