Overview
The NCP1200D100R2G, produced by onsemi, is a PWM current-mode controller designed for low-power universal off-line power supplies. It is housed in an SO-8 package and represents a significant advancement in ultra-compact switch-mode power supplies. This controller enables the implementation of complete offline battery chargers or standby SMPS with minimal external components. It features an internal output short-circuit protection, simplified feedback scheme, and operates at a fixed frequency of 100 kHz. The NCP1200 simplifies the design of reliable and cost-effective offline converters with excellent audio susceptibility and inherent pulse-by-pulse control.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SO-8 | |
| Operating Frequency | 100 kHz | |
| Control Mode | Current Mode | |
| Peak Current Source/Sink Capability | 250 mA | mA |
| Internal IC Consumption (No Output Load) | 710 - 880 | μA |
| Internal IC Consumption (1 nF Output Load, FSW = 100 kHz) | 1.9 - 2.2 | mA |
| Output Voltage Rise-time @ CL = 1 nF | 67 ns | ns |
| Output Voltage Fall-time @ CL = 1 nF | 28 ns | ns |
| Maximum Duty Cycle | 74 - 87% | % |
| Internal Temperature Shutdown | 150°C | °C |
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 protection against output short circuits.
- Extremely Low No-Load Standby Power: Optimized for low power consumption in standby mode.
- Current-Mode with Skip-Cycle Capability: Automatically enters skip cycle mode at light loads for excellent efficiency.
- Internal Leading Edge Blanking: Reduces noise and improves reliability.
- 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: Protects the IC from overheating.
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant: Environmentally friendly packaging.
Applications
- AC-DC Adapters: Ideal for compact and efficient power adapters.
- Offline Battery Chargers: Suitable for battery charging applications with minimal external components.
- Auxiliary/Ancillary Power Supplies: Used in various appliances such as USB power supplies, TVs, and other consumer electronics.
Q & A
- What is the operating frequency of the NCP1200D100R2G?
The NCP1200D100R2G operates at a fixed frequency of 100 kHz.
- What is the package type of the NCP1200D100R2G?
The NCP1200D100R2G is housed in an SO-8 package.
- Does the NCP1200D100R2G require an auxiliary winding?
No, the NCP1200D100R2G does not require an auxiliary winding as it is self-supplied from the DC rail.
- What is the peak current source/sink capability of the NCP1200D100R2G?
The peak current source/sink capability is 250 mA.
- How does the NCP1200D100R2G handle low load conditions?
The NCP1200D100R2G automatically enters skip cycle mode at light loads to provide excellent efficiency and reduce acoustic noise.
- What is the maximum duty cycle of the NCP1200D100R2G?
The maximum duty cycle is between 74% and 87%.
- Is the NCP1200D100R2G environmentally friendly?
- What are the typical applications of the NCP1200D100R2G?
The NCP1200D100R2G is typically used in AC-DC adapters, offline battery chargers, and auxiliary power supplies for various appliances.
- Does the NCP1200D100R2G have built-in protection against overheating?
- Are SPICE models available for the NCP1200D100R2G?
