Overview
The NCP1203D60R2G, produced by onsemi, is a PWM Current-Mode Controller designed for universal off-line power supplies. It is housed in an SOIC-8 package and is part of the NCP1203 series, which offers significant advancements in compact switchmode power supplies. This controller is particularly suited for applications requiring low part-count and high performance, such as AC-DC adapters, offline battery chargers, and auxiliary power supplies. The NCP1203D60R2G features onsemi's proprietary SMARTMOS Very High Voltage Technology, enabling the implementation of complete off-line AC-DC adapters with few external components.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| 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 = 60 kHz | ICC2 | - | 1.2 | 1.4 | mA |
| Oscillation Frequency, 60 kHz Version | fOSC | 57 | 65 | 73 | kHz |
| Maximum Duty-Cycle | Dmax | 74 | 80 | 87 | % |
| Peak Current Capability | - | - | 250 | - | mA |
Key Features
- High-Voltage Startup Current Source for clean and lossless startup sequence
- Auto-Recovery Internal Output Short-Circuit Protection to prevent thermal runaway
- Extremely Low No-Load Standby Power for efficient operation at light loads
- Current-Mode with Adjustable Skip-Cycle Capability for noise-free operation
- Internal Leading Edge Blanking for improved current sensing
- Internally Fixed Frequency at 40 kHz, 60 kHz, and 100 kHz options
- Direct Optocoupler Connection for feedback loop implementation
- Undervoltage Lockout at 7.8 V Typical for safe operation
- SPICE Models Available for transient and AC analysis
- Pin to Pin Compatible with NCP1200 for easy migration
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant
Applications
- AC-DC Adapters for notebooks and other portable devices
- Offline Battery Chargers
- Auxiliary Power Supplies (USB, appliances, TVs, etc.)
Q & A
- What is the primary function of the NCP1203D60R2G?
The NCP1203D60R2G is a PWM Current-Mode Controller designed for universal off-line power supplies, particularly for applications like AC-DC adapters, offline battery chargers, and auxiliary power supplies.
- What is the significance of the SMARTMOS Very High Voltage Technology in the NCP1203D60R2G?
The SMARTMOS Very High Voltage Technology allows the implementation of complete off-line AC-DC adapters with few external components, enhancing compactness and performance.
- How does the NCP1203D60R2G handle standby power efficiency?
The NCP1203D60R2G features an adjustable skip cycle mode that skips unwanted switching cycles at low power levels, significantly reducing standby power consumption and ensuring noise-free operation.
- What are the available switching frequency options for the NCP1203D60R2G?
The NCP1203D60R2G is available with internally fixed frequencies of 40 kHz, 60 kHz, and 100 kHz.
- How does the NCP1203D60R2G protect against overcurrent conditions?
The controller includes an efficient protective circuitry that disables output pulses and enters a safe burst mode in case of an output overload condition, with auto-recovery once the fault condition disappears.
- What is the purpose of the high-voltage startup current source in the NCP1203D60R2G?
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 NCP1203D60R2G handle short-circuit protection?
In the event of a short circuit on the output, the controller stops switching pulses, reduces consumption, and enters a recovery mode once the fault condition is resolved.
- Is the NCP1203D60R2G compatible with other devices?
Yes, the NCP1203D60R2G is pin-to-pin compatible with the NCP1200 series, making it easy to migrate between these devices.
- What are the environmental compliance standards for the NCP1203D60R2G?
The NCP1203D60R2G is Pb-Free, Halogen Free/BFR Free, and RoHS Compliant.
- How can the skip cycle level be adjusted in the NCP1203D60R2G?
The skip cycle level can be adjusted via the Adj pin, allowing the designer to set the level at which the skip cycle takes place to ensure noise-free operation.
- What is the significance of the leading edge blanking in the NCP1203D60R2G?
The leading edge blanking helps in improving the current sensing accuracy by ignoring the initial spike in the current sense signal.
