Overview
The NCP1200D40R2G, produced by onsemi, is a PWM current-mode controller designed for low-power universal off-line supplies. It is housed in an SOIC-8 package and represents a significant advancement in ultra-compact switch-mode power supplies. This controller allows for the implementation of complete offline battery chargers or standby SMPS with minimal external components. It features an integrated output short-circuit protection, enabling the design of extremely low-cost AC/DC wall adapters with simplified feedback schemes. The NCP1200 operates at a fixed frequency of 40 kHz and drives low gate-charge switching devices like IGBTs or MOSFETs, requiring very small operating power.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC-8 | |
| Operating Frequency | 40 kHz | |
| Control Mode | Current Mode | |
| Peak Current Source/Sink Capability | 250 mA | |
| VCC Maximum Voltage | 16 V | |
| Internal Temperature Shutdown | Yes | |
| Output Voltage Rise/Fall Time | 67 ns / 28 ns | |
| Source/Sink Resistance | 27-61 Ω / 5-25 Ω | |
| Maximum Duty Cycle | 74-87% | |
| Internal Pullup Resistor | 8.0 kΩ |
Key Features
- No Auxiliary Winding Operation: Self-supplied from the DC rail, eliminating the need for an auxiliary winding.
- Internal Output Short-Circuit Protection: Ensures safe operation and protects against short circuits.
- Extremely Low No-Load Standby Power: Optimized for low power consumption during standby.
- Current-Mode with Skip-Cycle Capability: Automatically enters skip cycle mode at low output power demand, enhancing efficiency.
- Internal Leading Edge Blanking: Reduces noise and improves stability.
- 250 mA Peak Current Source/Sink Capability: Supports high current requirements.
- Internally Fixed Frequency at 40 kHz, 60 kHz, and 100 kHz: Provides flexibility in design.
- Direct Optocoupler Connection: Simplifies feedback loop design.
- Built-in Frequency Jittering for Lower EMI: Reduces electromagnetic interference.
- SPICE Models Available for TRANsient and AC Analysis: Facilitates detailed simulation and analysis.
- Internal Temperature Shutdown: Ensures thermal protection.
- Pb-Free Packages are Available: Compliant with RoHS standards.
Applications
- AC/DC Adapters: Ideal for compact and efficient power adapters.
- Offline Battery Chargers: Suitable for charging batteries in offline mode.
- Auxiliary/Ancillary Power Supplies: Used in USB, appliances, TVs, and other devices.
Q & A
- What is the operating frequency of the NCP1200D40R2G?
The NCP1200D40R2G operates at a fixed frequency of 40 kHz.
- What type of control mode does the NCP1200D40R2G use?
The NCP1200D40R2G uses current-mode control.
- Does the NCP1200D40R2G require an auxiliary winding?
No, the NCP1200D40R2G is self-supplied from the DC rail and does not require an auxiliary winding.
- What is the peak current source/sink capability of the NCP1200D40R2G?
The peak current source/sink capability is 250 mA.
- What is the maximum duty cycle of the NCP1200D40R2G?
The maximum duty cycle is between 74% and 87%.
- Does the NCP1200D40R2G have built-in frequency jittering?
Yes, the NCP1200D40R2G has built-in frequency jittering to reduce EMI.
- Is the NCP1200D40R2G RoHS compliant?
Yes, the NCP1200D40R2G is Pb-Free, Halogen Free/BFR Free and is RoHS compliant.
- What are the typical applications of the NCP1200D40R2G?
Typical applications include AC/DC adapters, offline battery chargers, and auxiliary/ancillary power supplies.
- Does the NCP1200D40R2G have internal temperature shutdown?
Yes, the NCP1200D40R2G has internal temperature shutdown for thermal protection.
- Are SPICE models available for the NCP1200D40R2G?
Yes, SPICE models are available for transient and AC analysis.
