Overview
The NCP1203P100G, 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 8-pin PDIP package and is Pb-Free, Halogen Free/BFR Free, and RoHS compliant. The NCP1203P100G is optimized for low-part-count designs, particularly in low-cost AC-DC adapters and auxiliary power supplies, offering high performance and efficiency with minimal external components.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage (VCC, Drv) | VCC, Drv | - | - | 16 | V |
| Power Supply Voltage on all other pins except Pin 5 (Drv), Pin 6 (VCC) and Pin 8 (HV) | - | -0.3 | - | 10 | V |
| Turn-on Threshold Level, VCC Going Up | VCC(on) | 12.2 | 12.8 | 14 | V |
| Minimum Operating Voltage after Turn-on | VCC(min) | 7.2 | 7.8 | 8.4 | V |
| Internal IC Consumption, No Output Load on Pin 5 | ICC1 | - | 750 | 880 | μA |
| Internal IC Consumption, 1.0 nF Output Load on Pin 5, FSW = 40 kHz | ICC2 | - | 1.2 | 1.4 | mA |
| Oscillation Frequency (100 kHz Version) | fOSC | 90 | 103 | 115 | kHz |
| Maximum Duty-Cycle | Dmax | 74 | 80 | 87 | % |
Key Features
- High-Voltage Startup Current Source
- Auto-Recovery Internal Output Short-Circuit Protection
- Extremely Low No-Load Standby Power
- Current-Mode with Adjustable Skip-Cycle Capability
- Internal Leading Edge Blanking
- 250 mA Peak Current Capability
- Internally Fixed Frequency at 40 kHz, 60 kHz, and 100 kHz
- Direct Optocoupler Connection
- Undervoltage Lockout at 7.8 V Typical
- SPICE Models Available for Transient and AC Analysis
- Pin to Pin Compatible with NCP1200
Applications
- AC-DC Adapters for Notebooks, etc.
- Offline Battery Chargers
- Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
Q & A
- What is the NCP1203P100G used for?
The NCP1203P100G is used in universal off-line power supplies, such as AC-DC adapters, offline battery chargers, and auxiliary power supplies.
- What is the switching frequency of the NCP1203P100G?
The NCP1203P100G has an internally fixed switching frequency of 100 kHz, but other versions are available at 40 kHz and 60 kHz.
- How does the NCP1203P100G handle standby power?
The NCP1203P100G features an adjustable skip cycle mode that skips unwanted switching cycles at low power levels, significantly reducing standby power consumption.
- What protection features does the NCP1203P100G have?
The NCP1203P100G includes auto-recovery internal output short-circuit protection, overcurrent protection, and temperature shutdown with hysteresis.
- Is the NCP1203P100G RoHS compliant?
Yes, the NCP1203P100G is Pb-Free, Halogen Free/BFR Free, and RoHS compliant.
- How does the startup sequence work for the NCP1203P100G?
The startup sequence involves an internal current source charging the VCC capacitor until it reaches the turn-on threshold, after which the current source turns off and the auxiliary supply takes over.
- What is the maximum duty cycle of the NCP1203P100G?
The maximum duty cycle of the NCP1203P100G is 80%.
- Can the NCP1203P100G be used in place of UC384X devices?
Yes, the NCP1203P100G is designed to be pin-to-pin compatible with NCP1200 and can replace UC384X devices in many applications.
- How does the skip cycle mode work in the NCP1203P100G?
The skip cycle mode is activated when the output power demand drops below a certain level, causing the IC to skip switching cycles and reduce power consumption.
- What is the purpose of the HV pin in the NCP1203P100G?
The HV pin ensures a clean and lossless startup sequence by injecting a constant current into the VCC capacitor during startup.
