Overview
The NCP1200D100R2, produced by ON Semiconductor, is a PWM Current-Mode Controller designed for low-power universal off-line supplies. This controller is housed in SOIC-8 or PDIP-8 packages and represents a significant advancement in ultra-compact switchmode power supplies. It integrates all necessary components for a complete offline battery charger or standby SMPS with minimal external components. The NCP1200D100R2 operates at a fixed frequency of 100 kHz and is optimized for driving low gate-charge switching devices such as IGBTs or MOSFETs, ensuring low operating power and high efficiency.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Frequency | 86 | 103 | 116 | kHz |
| VCC Increasing Level at Which the Current Source Turns-off | 10.3 | 11.4 | 12.5 | V |
| VCC Decreasing Level at Which the Current Source Turns-on | 8.8 | 9.8 | 11 | V |
| Internal IC Consumption, No Output Load on Pin 5 | 710 | 880 | - | μA |
| Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 100 kHz | 1.9 | 2.2 | - | mA |
| High-voltage Current Source, VCC = 10 V | 2.8 | 4.0 | - | mA |
| Output Voltage Rise-time @ CL = 1 nF, 10-90% of Output Signal | - | 67 | - | ns |
| Output Voltage Fall-time @ CL = 1 nF, 10-90% of Output Signal | - | 28 | - | ns |
| Maximum Duty Cycle | 74 | 80 | 87 | % |
Key Features
- No Auxiliary Winding Operation: The NCP1200 is self-supplied from the DC rail, eliminating the need for an auxiliary winding.
- Internal Output Short-Circuit Protection: Built-in protection against output 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 light loads for excellent efficiency.
- Internal Leading Edge Blanking: Reduces noise and improves reliability.
- 250 mA Peak Current Source/Sink Capability: High current handling for driving switching devices.
- Internally Fixed Frequency at 100 kHz: Stable and consistent switching frequency.
- 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 device from overheating.
- Pb-Free, Halogen Free/BFR Free and RoHS Compliant: Environmentally friendly and compliant with regulations.
Applications
- AC-DC Adapters: Ideal for compact and efficient power adapters.
- Offline Battery Chargers: Suitable for battery charging applications with minimal external components.
- Auxiliary Supplies: Used in various auxiliary power supply applications where low part count is crucial.
Q & A
- What is the operating frequency of the NCP1200D100R2?
The NCP1200D100R2 operates at a fixed frequency of 100 kHz.
- Does the NCP1200D100R2 require an auxiliary winding?
No, the NCP1200D100R2 is self-supplied from the DC rail and does not require an auxiliary winding.
- What is the purpose of the skip cycle mode in the NCP1200D100R2?
The skip cycle mode is activated at light loads to improve efficiency and reduce noise by skipping switching cycles.
- How does the NCP1200D100R2 protect against output short circuits?
The NCP1200D100R2 has built-in output short-circuit protection to prevent damage during such events.
- What is the maximum duty cycle of the NCP1200D100R2?
The maximum duty cycle is between 74% and 87%.
- Is the NCP1200D100R2 environmentally friendly?
- What is the typical internal IC consumption at no load on Pin 5?
The typical internal IC consumption at no load on Pin 5 is between 710 μA and 880 μA.
- How does the NCP1200D100R2 handle high temperatures?
The NCP1200D100R2 has an internal temperature shutdown feature to protect the device from overheating.
- What are the typical output voltage rise and fall times of the NCP1200D100R2?
The typical output voltage rise time is 67 ns, and the fall time is 28 ns.
- Are SPICE models available for the NCP1200D100R2?
