Overview
The NCP1071STBT3G is a high-voltage switcher integrated circuit (IC) designed by onsemi for low-power offline Switch-Mode Power Supplies (SMPS). This IC is part of the NCP107x family, which combines a fixed-frequency current-mode controller with a built-in 700 V MOSFET. The NCP1071STBT3G is available in SOT-223 and PDIP-7 packages, offering a high level of integration and various protection features.
This device is notable for its quiet operation, featuring frequency-jittering and skip-cycle modes to enhance efficiency at light loads. It also includes soft-start, ramp compensation, and Dynamic Self-Supply, eliminating the need for an auxiliary winding. The IC provides excellent standby performance and low input power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Switch Circuit On-State Resistance (RDS(on)) | 22 | Ω |
| Peak Current (Ipeak) | 350 | mA |
| Oscillator Frequency | 100 | kHz |
| Drain Voltage (BVdss) | 700 | V |
| Maximum Duty Cycle | 62-68% | % |
| VCC Power Supply Voltage | -0.3 to 10 | V |
| Internal IC Consumption (ICC1) | 0.7-1.3 | mA |
| Soft-Start Duration (TSS) | 1 | ms |
| Leading Edge Blanking Duration (TLEB) | 200 | ns |
| Propagation Delay (Tprop) | 100 | ns |
Key Features
- Built-in 700 V MOSFET with RDS(on) of 22 Ω
- Current-Mode Fixed Frequency Operation at 100 kHz
- Peak Current of 350 mA
- Soft-Start and Frequency-Jittering for reduced EMI
- Skip-Cycle and Frequency Foldback for improved efficiency at light loads
- Dynamic Self-Supply eliminating the need for an auxiliary winding
- Overvoltage Protection with auto-recovery and AC input line voltage detection
- Large Creepage Distance Between High-Voltage Pins
- Ramp Compensation and Maximum Peak Current Set Point
- Short-Circuit Protection and Timer for overload detection
Applications
The NCP1071STBT3G is suitable for various low-power offline SMPS applications, including:
- Power Adapters
- Set-Top Boxes and DVD Players
- Small Appliances and White Goods
- LED Lighting and Display Backlighting
- Industrial Power Supplies
Q & A
- What is the maximum drain voltage of the NCP1071STBT3G?
The maximum drain voltage (BVdss) is 700 V.
- What are the available oscillator frequencies for the NCP1071STBT3G?
The available oscillator frequencies are 65 kHz, 100 kHz, and 130 kHz.
- What is the peak current limit of the NCP1071STBT3G?
The peak current limit is 350 mA.
- Does the NCP1071STBT3G have built-in overvoltage protection?
Yes, it includes overvoltage protection with auto-recovery and AC input line voltage detection.
- What is the purpose of the Dynamic Self-Supply feature?
The Dynamic Self-Supply feature eliminates the need for an auxiliary winding.
- How does the skip-cycle mode improve efficiency?
The skip-cycle mode reduces standby consumption by skipping switching cycles when the power demand is low.
- What is the typical soft-start duration of the NCP1071STBT3G?
The soft-start duration is 1 ms.
- What is the maximum duty cycle of the NCP1071STBT3G?
The maximum duty cycle is between 62% and 68%.
- Does the NCP1071STBT3G have short-circuit protection?
Yes, it includes short-circuit protection with a timer for overload detection.
- What are the typical package options for the NCP1071STBT3G?
The IC is available in SOT-223 and PDIP-7 packages.
