Overview
The NCP1397BDR2G, produced by onsemi, is a high-performance resonant mode controller designed for use in half-bridge resonant topologies such as series resonant, parallel resonant, and LLC resonant converters. This controller integrates 600 V high-voltage gate drivers, simplifying the layout and reducing the external component count. It features a 500 kHz Voltage Controlled Oscillator (VCO) and a unique architecture that includes adjustable deadtime, startup sequence via an externally adjustable soft-start, and various protection features. The NCP1397BDR2G is ideal for building reliable and rugged resonant mode power supplies with low standby power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| High Voltage Bridge Pin | -1 to 600 | V |
| Floating Supply Voltage | 0 to 20 | V |
| Minimum Switching Frequency | 58.2 to 61.8 | kHz |
| Maximum Switching Frequency | 440 to 560 | kHz |
| Adjustable Deadtime | 100 ns to 2 μs | |
| Startup Current | 300 μA | |
| Internal IC Consumption (no output load) | 4 mA | |
| Internal IC Consumption (with output load) | 11 mA | |
| Output Voltage Rise Time | 40 ns | |
| Output Voltage Fall Time | 20 ns | |
| Source Resistance | 13 Ω | |
| Sink Resistance | 5.5 Ω |
Key Features
- High-frequency operation from 50 kHz up to 500 kHz
- 600 V high-voltage floating driver
- Adjustable minimum switching frequency with ±3% accuracy
- Adjustable deadtime from 100 ns to 2 μs
- Startup sequence via an externally adjustable soft-start
- Brown-out protection for simpler PFC association
- Latched input for severe fault conditions (e.g., over temperature or OVP)
- Timer-based input with auto-recovery operation for delayed event reaction
- Latched overcurrent protection
- Disable input for immediate event reaction or simple ON/OFF control
- VCC operation up to 20 V
- Low startup current of 300 μA
- 1 A/0.5 A peak current sink/source drive capability
- Common collector optocoupler connection for easier ORing
- Optional common emitter optocoupler connection
- Internal temperature shutdown
- AEC-Q100 qualified and PPAP capable for automotive and other applications requiring unique site and control change requirements
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
- Flat panel display power converters
- High power AC-DC adapters for notebooks
- Computing power supplies
- Industrial and medical power sources
- Offline battery chargers
Q & A
- What is the NCP1397BDR2G used for?
The NCP1397BDR2G is used in half-bridge resonant topologies such as series resonant, parallel resonant, and LLC resonant converters.
- What is the voltage range of the high-voltage bridge pin?
The high-voltage bridge pin operates within a range of -1 to 600 V.
- What is the maximum switching frequency of the NCP1397BDR2G?
The maximum switching frequency is up to 500 kHz.
- How is the deadtime adjusted in the NCP1397BDR2G?
The deadtime is adjustable from 100 ns to 2 μs via an external resistor connected to ground.
- What protection features does the NCP1397BDR2G include?
The controller includes features such as brown-out protection, open optocoupler protection, soft-start, short-circuit protection, and internal temperature shutdown.
- What is the purpose of the fault input in the NCP1397BDR2G?
The fault input is designed to protect LLC applications in case of short circuits or overloads by activating the fault timer and increasing the operating frequency of the converter.
- How does the NCP1397BDR2G handle cumulative fault events?
The timer capacitor integrates fault events and cumulates their occurrences. A resistor in parallel with the capacitor adjusts the discharge rate and thus the auto-recovery retry rate.
- What is the startup current of the NCP1397BDR2G?
The startup current is 300 μA.
- Is the NCP1397BDR2G suitable for automotive applications?
Yes, it is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other applications requiring unique site and control change requirements.
- Is the NCP1397BDR2G RoHS compliant?
Yes, the device is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What are some typical applications of the NCP1397BDR2G?
Typical applications include flat panel display power converters, high power AC-DC adapters for notebooks, computing power supplies, industrial and medical power sources, and offline battery chargers.
