Overview
The NCP1203D60R2, produced by onsemi, is a PWM Current-Mode Controller designed for universal off-line power supplies. It features onsemi's proprietary SMARTMOS™ Very High Voltage Technology, making it an excellent candidate for replacing UC384X devices. This controller is housed in an SOIC-8 package and is particularly suited for low-part-count, low-cost AC-DC adapters and auxiliary power supplies. It integrates all necessary components for a complete off-line AC-DC supply, including timing components, feedback devices, and a high-voltage startup FET, eliminating the need for an external startup resistance.
Key Specifications
| Characteristic | Symbol | Pin | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Turn-on Threshold Level, VCC Going Up | VCC(on) | 6 | 12.2 | 12.8 | 14 | V |
| Minimum Operating Voltage after Turn-on | VCC(min) | 6 | 7.2 | 7.8 | 8.4 | V |
| Internal IC Consumption, No Output Load on Pin 5 | ICC1 | 6 | - | 750 | 880 | μA |
| Internal IC Consumption, 1.0 nF Output Load on Pin 5, FSW = 40 kHz | ICC2 | 6 | - | 1.2 | 1.4 | mA |
| Oscillation Frequency, 60 kHz Version | fOSC | - | 57 | 65 | 73 | kHz |
| Maximum Duty-Cycle | Dmax | - | 74 | 80 | 87 | % |
| Source Resistance | ROH | 5 | 27 | 40 | 61 | Ω |
| Sink Resistance | ROL | 5 | 5.0 | 10 | 20 | Ω |
Key Features
- High-Voltage Startup Current Source: Ensures a clean and lossless startup sequence.
- Auto-Recovery Internal Output Short-Circuit Protection: Protects against overloads and short circuits with auto-recovery.
- Extremely Low No-Load Standby Power: Reduces power consumption in standby conditions.
- Current-Mode with Adjustable Skip-Cycle Capability: Adjusts the skip cycle level to optimize efficiency at light loads.
- Internal Leading Edge Blanking: Enhances noise immunity and stability.
- 250 mA Peak Current Capability: Supports high current demands.
- Internally Fixed Frequency at 40 kHz, 60 kHz, and 100 kHz: Offers flexibility in switching frequency selection.
- Direct Optocoupler Connection: Simplifies feedback loop implementation.
- Undervoltage Lockout at 7.8 V Typical: Ensures safe operation by preventing startup below a certain voltage threshold.
- SPICE Models Available for Transient and AC Analysis: Facilitates detailed simulation and analysis.
- Pb-Free, Halogen Free/BFR Free and RoHS Compliant: Meets environmental and safety standards.
Applications
- AC-DC Adapters for Notebooks, etc.: Ideal for compact and efficient power supplies.
- Offline Battery Chargers: Suitable for charging batteries in various devices.
- Auxiliary Power Supplies (USB, Appliances, TVs, etc.): Used in a variety of auxiliary power supply applications.
Q & A
- What is the NCP1203D60R2 used for?
The NCP1203D60R2 is used as a PWM Current-Mode Controller for universal off-line power supplies, including AC-DC adapters, offline battery chargers, and auxiliary power supplies.
- What is the switching frequency of the NCP1203D60R2?
The NCP1203D60R2 operates at a fixed switching frequency of 60 kHz.
- What is the purpose of the high-voltage startup current source?
The high-voltage startup current source ensures a clean and lossless startup sequence by charging the VCC capacitor during the startup phase.
- How does the skip cycle mode work?
The skip cycle mode is activated when the output power demand drops below a certain level, causing the IC to skip switching cycles to reduce standby power and noise.
- What kind of protection does the NCP1203D60R2 offer?
The NCP1203D60R2 includes auto-recovery internal output short-circuit protection, overcurrent protection, and temperature shutdown with hysteresis.
- What is the maximum duty cycle of the NCP1203D60R2?
The maximum duty cycle is 80%.
- Is the NCP1203D60R2 environmentally compliant?
Yes, the NCP1203D60R2 is Pb-Free, Halogen Free/BFR Free, and RoHS compliant.
- What is the typical undervoltage lockout voltage?
The typical undervoltage lockout voltage is 7.8 V.
- Can the NCP1203D60R2 be used in place of UC384X devices?
Yes, the NCP1203D60R2 is designed to replace UC384X devices due to its similar functionality and improved features.
- What package types are available for the NCP1203D60R2?
The NCP1203D60R2 is available in SOIC-8 packages.
