Overview
The NCP1230D65R2G, produced by onsemi, is a current-mode PWM controller designed to achieve low standby power in 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. The controller is housed in a compact 8-pin SOIC-8 package and integrates all necessary control functionality to build efficient and rugged power supplies. It features an event management scheme that disables the front-end PFC circuit during standby, reducing no-load power consumption, and includes a high-voltage startup circuit that eliminates external components and reduces power consumption.
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 |
| Propagation Delay from CS Detected to Gate Turned Off | TDEL CS | 3 | - | 90 | 180 | ns |
| Leading Edge Blanking Duration | TLEB | 3 | 100 | 200 | 350 | ns |
| Soft-Start Period | SS | - | - | 2.5 | - | ms |
| Temperature Shutdown, Maximum Value | TSD | - | 150 | 165 | - | °C |
| Hysteresis while in Temperature Shutdown | TSD hyste | - | - | 25 | - | °C |
| Oscillation Frequency (65 kHz Version) | - | - | 12.0 | 12.2 | 12.4 | 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 to prevent acoustic noise
- 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
- +500 mA / -800 mA Peak Current Drive Capability
- Available in Three Frequency Options: 65 kHz, 100 kHz, and 133 kHz
- Direct Optocoupler Connection
- SPICE Models Available for Transient and AC Analysis
- Pb-Free Packages are Available
Applications
- High Power AC/DC Adapters for Notebooks
- Offline Battery Chargers
- Flat TVs, DVD RW, Home Theatre, Set Top Boxes
- Computer Monitors and other Consumer Electronics Equipment
Q & A
- What is the primary function of the NCP1230?
The NCP1230 is a current-mode PWM controller designed for medium-to-high power Switched-Mode Power Supplies, aiming to achieve low standby power.
- What are the key features of the NCP1230's event management scheme?
The event management scheme disables the front-end PFC circuit during standby, reducing no-load power consumption, and includes cycle skipping at light loads to prevent acoustic noise.
- How does the NCP1230 handle high-voltage startup?
The NCP1230 features an internal high-voltage startup current source that eliminates external components and reduces power consumption.
- What protection mechanisms are built into the NCP1230?
The NCP1230 includes latched primary overcurrent and overvoltage protection, short-circuit protection independent of auxiliary level, and temperature shutdown.
- What is the purpose of the skip-cycle capability in the NCP1230?
The skip-cycle capability at low peak currents prevents acoustic noise and reduces power consumption during light load conditions.
- How does the NCP1230 connect to a PFC controller?
The NCP1230 can be directly connected to a PFC controller using the PFC_VCC output pin, which provides the bias supply power for the PFC controller.
- What is the soft-start period of the NCP1230?
The NCP1230 has an internal 2.5 ms soft-start period.
- What are the available frequency options for the NCP1230?
The NCP1230 is available in three frequency options: 65 kHz, 100 kHz, and 133 kHz.
- How does the NCP1230 handle EMI?
The NCP1230 features internal frequency jittering to improve the EMI signature.
- What is the peak current drive capability of the NCP1230?
The NCP1230 has a peak current drive capability of +500 mA / -800 mA.
