Overview
The NCP1230D100R2G, produced by onsemi, is a high-performance 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 various consumer electronics equipment. This controller is housed in a compact 8-pin package (SOIC-8) and integrates all necessary control functionality to build efficient and rugged power supplies.
The NCP1230 features advanced technologies to minimize standby power consumption and optimize performance under various load conditions. It includes an event management scheme, internal high-voltage startup, and skip-cycle capability to reduce no-load power consumption and prevent acoustic noise.
Key Specifications
| Characteristic | Symbol | Pin | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Turn-On Threshold Level, VCC Going Up | VCCOFF | 6 | 11.6 | 12.6 | 13.6 | V |
| Minimum Operating Voltage after Turn-On | VCC(min) | 6 | 7.0 | 7.7 | 8.4 | V |
| VCC Decreasing Level at which the Latch-Off Phase Ends | VCClatch | 6 | 5.0 | 5.6 | 6.2 | V |
| Internal IC Consumption, No Output Load on Pin 6 | ICC1 | 6 | 0.6 | 1.1 | 1.8 | mA |
| Output Voltage Rise-Time @ CL = 1.0 nF, 10-90% of Output Signal | Tr | 5 | - | 40 | - | ns |
| Output Voltage Fall-Time @ CL = 1.0 nF, 10-90% of Output Signal | Tf | 5 | - | 15 | - | ns |
| Internal Oscillator Oscillation Frequency (100 kHz Version) | fOSC | - | 90 | 100 | 110 | kHz |
| Maximum Duty-Cycle (CS = 0, Vfb = 2.5 V) | Dmax | - | 75 | 80 | 85 | % |
Key Features
- Current-Mode Operation with Internal Ramp Compensation: Ensures stable and efficient operation.
- Internal High-Voltage Startup Current Source: Provides lossless startup and eliminates the need for external startup circuitry.
- Extremely Low No-Load Standby Power: Reduces power consumption during standby modes.
- Skip-Cycle Capability at Low Peak Currents: Prevents acoustic noise and reduces power consumption at light loads.
- Direct Connection to PFC Controller: Improves no-load standby power by disabling the PFC circuit during standby.
- Internal 2.5 ms Soft-Start: Gradually increases the output voltage to prevent inrush current.
- Internal Leading Edge Blanking: Reduces noise and improves reliability.
- Latched Primary Overcurrent and Overvoltage Protection: Provides robust protection against faults.
- Short-Circuit Protection Independent of Auxiliary Level: Ensures protection even under varying auxiliary conditions.
- Internal Frequency Jittering for Improved EMI Signature: Reduces electromagnetic interference.
Applications
- Notebook Adapters: Ideal for power supplies in portable computing devices.
- Off-Line Battery Chargers: Suitable for charging batteries in various consumer electronics.
- Consumer Electronics Equipment: Used in set-top boxes, TVs, and computer monitors.
- Power Factor Correction (PFC) Applications: Can be connected directly to PFC controllers for improved efficiency.
Q & A
- What is the primary function of the NCP1230D100R2G?
The NCP1230D100R2G is a PWM controller designed for medium to high power switched-mode power supplies, providing all necessary control logic and protection in a single chip.
- What are the key benefits of the internal high-voltage startup current source?
The internal high-voltage startup current source provides lossless startup and eliminates the need for external startup circuitry, reducing component count and power consumption.
- How does the NCP1230D100R2G reduce no-load standby power?
The controller features an event management scheme that disables the PFC circuit during standby and enters a skip-cycle mode at low loads, significantly reducing no-load power consumption.
- What protection mechanisms are built into the NCP1230D100R2G?
The controller includes latched primary overcurrent and overvoltage protection, short-circuit protection independent of auxiliary level, and thermal shutdown.
- How does the NCP1230D100R2G handle soft-start and leading edge blanking?
The controller features an internal 2.5 ms soft-start to gradually increase the output voltage and internal leading edge blanking to reduce noise and improve reliability.
- What is the purpose of the internal frequency jittering?
The internal frequency jittering is used to improve the EMI signature of the power supply, reducing electromagnetic interference.
- What are the typical operating voltage ranges for the NCP1230D100R2G?
The minimum operating voltage after turn-on is typically 7.7 V, with a turn-on threshold level of 12.6 V and a latch-off level of 5.6 V.
- How does the skip-cycle mode work in the NCP1230D100R2G?
In skip-cycle mode, the controller prevents the current from decreasing further when the feedback voltage drops below 25% of the maximum peak current, reducing power consumption and preventing acoustic noise.
- What is the maximum duty cycle of the NCP1230D100R2G?
The maximum duty cycle is typically 80%.
- What are the common applications of the NCP1230D100R2G?
Common applications include notebook adapters, off-line battery chargers, and consumer electronics equipment such as set-top boxes, TVs, and computer monitors.
