Overview
The NCP1203P60, 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 either an SOIC-8 or PDIP-8 package and is ideal for applications requiring low part-count and high performance, such as AC-DC adapters, offline battery chargers, and auxiliary power supplies.
The NCP1203P60 operates at a fixed switching frequency of 60 kHz and includes a high-voltage startup FET for a clean and lossless startup sequence. It also features current-mode control, which provides good audio-susceptibility and inherent pulse-by-pulse control. The device automatically enters skip cycle mode at light loads to improve efficiency and reduce standby power consumption.
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 = 60 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 | % |
| Maximum Current into all pins except Pin 6 (VCC) and Pin 8 (HV) | - | - | -0.3 | 10 | V |
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 60 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
- Pb-Free, Halogen Free/BFR Free and RoHS Compliant
Applications
- AC-DC Adapters for Notebooks, etc.
- Offline Battery Chargers
- Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
Q & A
- What is the typical switching frequency of the NCP1203P60?
The NCP1203P60 operates at a fixed switching frequency of 60 kHz.
- What is the purpose of the high-voltage startup FET in the NCP1203P60?
The high-voltage startup FET ensures a clean and lossless startup sequence.
- How does the NCP1203P60 manage low no-load standby power?
The device automatically enters skip cycle mode at light loads to improve efficiency and reduce standby power consumption.
- What is the maximum duty-cycle of the NCP1203P60?
The maximum duty-cycle is 80%.
- Does the NCP1203P60 have built-in overcurrent protection?
Yes, it includes an efficient protective circuitry with auto-recovery internal output short-circuit protection.
- How does the skip cycle mode work in the NCP1203P60?
The skip cycle mode is activated when the output power demand drops below a given level, and it blanks the output pulses to reduce power transfer.
- Is the NCP1203P60 compatible with other devices?
Yes, it is pin to pin compatible with the NCP1200.
- What are the package options for the NCP1203P60?
The device is available in SOIC-8 and PDIP-8 packages.
- Is the NCP1203P60 RoHS compliant?
Yes, it is Pb-Free, Halogen Free/BFR Free and RoHS Compliant.
- What is the typical undervoltage lockout level for the NCP1203P60?
The typical undervoltage lockout level is 7.8 V.
