Overview
The NCP1203D100R2 is a PWM (Pulse Width Modulation) current-mode controller produced by onsemi. This component is designed for use in universal off-line power supplies, including AC-DC adapters, offline battery chargers, and auxiliary power supplies. It features onsemi's proprietary SMARTMOS™ Very High Voltage Technology, which enables the implementation of complete off-line AC-DC adapters with few external components. The NCP1203D100R2 is housed in either an SOIC-8 or PDIP-8 package and operates at fixed switching frequencies of 40 kHz, 60 kHz, or 100 kHz.
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 |
| VCC Decreasing Level at which the Latchoff Phase Ends | VCClatch | 6 | - | 4.9 | - | 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 |
| Peak Current Capability | - | - | - | - | 250 mA | - |
| Switching Frequency | - | - | 40 kHz | 60 kHz | 100 kHz | - |
Key Features
- High-Voltage Startup Current Source: Ensures a clean and lossless startup sequence.
- Auto-Recovery Internal Output Short-Circuit Protection: Protects against overload conditions and automatically recovers when the fault is cleared.
- Extremely Low No-Load Standby Power: Reduces power consumption during light load conditions.
- Current-Mode with Adjustable Skip-Cycle Capability: Allows for adjustable skip cycle levels to ensure noise-free operation.
- Internal Leading Edge Blanking: Enhances the controller's performance.
- 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.
- Pb-Free, Halogen Free/BFR Free and RoHS Compliant: Meets environmental and safety standards.
Applications
- AC-DC Adapters for Notebooks, etc.
- Offline Battery Chargers
- Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
Q & A
- What is the NCP1203D100R2 used for?
The NCP1203D100R2 is used in universal off-line power supplies, including AC-DC adapters, offline battery chargers, and auxiliary power supplies.
- What are the available switching frequencies for the NCP1203D100R2?
The available switching frequencies are 40 kHz, 60 kHz, and 100 kHz.
- How does the NCP1203D100R2 handle overload conditions?
The NCP1203D100R2 features auto-recovery internal output short-circuit protection, which stops switching pulses and enters a burst mode to prevent thermal runaway. It automatically recovers when the fault is cleared.
- What is the purpose of the skip cycle mode in the NCP1203D100R2?
The skip cycle mode reduces standby power by skipping unnecessary switching cycles when the output power demand is low, ensuring noise-free operation.
- How does the NCP1203D100R2 ensure low no-load standby power?
The NCP1203D100R2 reduces power consumption during light load conditions by skipping unneeded switching cycles.
- Is the NCP1203D100R2 environmentally compliant?
Yes, the NCP1203D100R2 is Pb-Free, Halogen Free/BFR Free, and RoHS compliant.
- What is the typical undervoltage lockout level for the NCP1203D100R2?
The typical undervoltage lockout level is 7.8 V.
- How does the high-voltage startup current source work in the NCP1203D100R2?
The high-voltage startup current source injects a constant current into the VCC capacitor during the startup sequence, ensuring a clean and lossless startup.
- Can the NCP1203D100R2 be used with external MOSFETs?
Yes, the NCP1203D100R2 allows for the use of external MOSFETs, enabling the selection of avalanche-proof devices and control over the MOSFET gate signal flow.
- Are SPICE models available for the NCP1203D100R2?
Yes, SPICE models are available for transient and AC analysis of the NCP1203D100R2.
