Overview
The NCP1397ADR2G, 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, which simplifies the layout and reduces the external component count. It features a 500 kHz Voltage Controlled Oscillator (VCO) and includes a suite of protection features to ensure reliable and rugged operation in various power supply applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Turn-on Threshold | 9.7 | 10.5 | 11.3 | V |
| VCC Minimum Operating Voltage | 8.7 | 9.5 | 10.3 | V |
| VBOOT Startup Voltage | 8 | 9 | 10 | V |
| Minimum Switching Frequency | 58.2 | 60 | 61.8 | kHz |
| Maximum Switching Frequency | 440 | 500 | 560 | kHz |
| Adjustable Deadtime | 100 ns | - | 2 μs | - |
| Startup Current | - | - | 300 μA | - |
| Peak Current Sink/Source Drive Capability | - | - | 1 A / 0.5 A | - |
| Internal Temperature Shutdown | - | - | 150°C | - |
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
- 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 NCP1397ADR2G used for?
The NCP1397ADR2G is used in half-bridge resonant topologies such as series resonant, parallel resonant, and LLC resonant converters.
- What is the voltage range of the VCC supply?
The VCC supply can operate up to 20 V.
- What are the minimum and maximum switching frequencies of the NCP1397ADR2G?
The minimum switching frequency is 58.2 kHz, and the maximum is 560 kHz.
- What protection features does the NCP1397ADR2G include?
The controller includes features such as brown-out protection, open optocoupler protection, soft-start protection, short-circuit protection, and internal temperature shutdown.
- How is the deadtime adjusted in the NCP1397ADR2G?
The deadtime is adjustable from 100 ns to 2 μs via an external resistor connected to ground.
- What is the purpose of the fault input in the NCP1397ADR2G?
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.
- Is the NCP1397ADR2G 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.
- What is the startup current of the NCP1397ADR2G?
The startup current is 300 μA.
- How does the NCP1397ADR2G handle cumulative fault events?
The timer capacitor integrates fault information and cumulates occurrences. A resistor in parallel with the capacitor adjusts the discharge rate and thus the auto-recovery retry rate.
- What are the typical applications of the NCP1397ADR2G?
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.
- Is the NCP1397ADR2G RoHS compliant?
Yes, the NCP1397ADR2G is Pb-free, halogen-free/BFR-free, and RoHS compliant.
