Overview
The NCP1396BDR2G, produced by onsemi, is a high-performance resonant mode controller designed for building reliable and rugged resonant mode power supplies. This controller features a unique architecture that includes a 500 kHz Voltage Controlled Oscillator (VCO) and high-voltage drivers, making it suitable for a variety of high-power applications. The NCP1396BDR2G offers advanced protection features, adjustable deadtime, and soft-start capabilities, ensuring safe and efficient operation.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Turn-on threshold level, VCC going up – B version | VCCON | 9.5 | 10.5 | 11.5 | V |
| Minimum operating voltage after turn-on | VCC(min) | 8.5 | 9.5 | 10.5 | V |
| Startup voltage on the floating section | VbootON | 8 | 9 | 10 | V |
| Startup current, VCC < VCCON | Istartup | - | - | 300 | μA |
| Internal IC consumption, no output load | ICC1 | - | - | 4 | mA |
| Minimum switching frequency | Fsw min | 58.2 | 60 | 61.8 | kHz |
| Maximum switching frequency | Fsw max | 425 | 500 | 575 | kHz |
| Adjustable deadtime | T_dead | 100 ns | 300 ns | 2 μs | - |
| High Voltage bridge pin | VBRIDGE | -1 | - | 600 | V |
Key Features
- High-frequency Operation: The controller operates at frequencies from 50 kHz up to 500 kHz.
- High-Voltage Floating Driver: Supports bulk voltages up to 600 V.
- Selectable Minimum Switching Frequency: With ±3% accuracy.
- Adjustable Deadtime: From 100 ns to 2 μs to prevent cross-conduction between transistors.
- Startup Sequence via Adjustable Soft-start: Ensures a smooth startup by gradually increasing the switching frequency.
- Brown-out Protection: Simplifies PFC association and ensures a clean startup sequence.
- Latched Input for Severe Fault Conditions: Includes over temperature and OVP protection.
- Timer-based Input with Auto-recovery Operation: For delayed event reaction.
- Enable Input for Immediate Event Reaction or Simple ON/OFF Control: Flexible control options.
- Internal Temperature Shutdown: Ensures the controller shuts down in case of overheating.
- Common Collector Optocoupler Connection: Facilitates easier ORing implementations.
Applications
- Flat Panel Display Power Converters: Suitable for high-power display applications.
- High Power AC/DC Adapters for Notebooks: Ideal for high-power portable devices.
- Industrial and Medical Power Sources: Recommended for industrial and medical applications due to its robust features.
- Offline Battery Chargers: Can be used in battery charging systems.
Q & A
- What is the operating frequency range of the NCP1396BDR2G?
The operating frequency range is from 50 kHz up to 500 kHz.
- What is the maximum voltage supported by the high-voltage floating driver?
The high-voltage floating driver supports bulk voltages up to 600 V.
- How is the deadtime adjusted in the NCP1396BDR2G?
The deadtime is adjusted using a single resistor wired to ground, allowing for a range from 100 ns to 2 μs.
- What is the purpose of the soft-start sequence in the NCP1396BDR2G?
The soft-start sequence ensures a smooth startup by gradually increasing the switching frequency to the programmed maximum value and then reducing it to the minimum frequency until the feedback loop closes.
- What protection features are included in the NCP1396BDR2G?
The controller includes brown-out protection, latched input for severe fault conditions, timer-based input with auto-recovery operation, and internal temperature shutdown.
- How does the fast fault input work in the NCP1396BDR2G?
The fast fault input immediately stops all pulses and remains in that state as long as the driving signal is high. Upon release, the controller can either restart without soft-start (A version) or through a regular soft-start sequence (B version).
- What is the difference between the A and B versions of the NCP1396?
The main differences are in the startup thresholds and the behavior upon release of the fast fault input. The B version has a lower startup threshold and activates soft-start upon release of the fast fault for any feedback conditions.
- How is the broken feedback loop detection handled in the NCP1396BDR2G?
Upon startup or during operation, if the FB signal is missing, the timer starts to charge a capacitor. If the loop is broken, the FB level does not increase before the timer ends, causing the controller to stop all pulses and wait for the timer pin voltage to collapse before attempting a new startup.
- What is the purpose of the timer-based input in the NCP1396BDR2G?
The timer-based input allows for delayed event reaction, enabling the controller to wait for a specified duration before taking corrective action in case of a fault.
- What are the typical applications of the NCP1396BDR2G?
Typical applications include flat panel display power converters, high power AC/DC adapters for notebooks, industrial and medical power sources, and offline battery chargers.
