Overview
The NCP1396ADR2G, produced by onsemi, is a high-performance resonant mode controller designed to build 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 device is available in two versions, A and B, each with slightly different startup thresholds and operational characteristics.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| High Voltage Bridge Pin | VBRIDGE | -1 | 600 | V | |
| Minimum Switching Frequency | Fsw min | 58.2 | 60 | 61.8 | kHz |
| Maximum Switching Frequency | Fsw max | 425 | 500 | 575 | kHz |
| Turn-on Threshold Level (A Version) | VCCON | 12.3 | 13.4 | 14.3 | V |
| Turn-on Threshold Level (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 Current | Istartup | 300 | 350 | μA | |
| Internal IC Consumption (No Load) | ICC1 | 4 | mA | ||
| Internal IC Consumption (1 nF Load) | ICC2 | 11 | mA | ||
| Consumption in Fault Mode | ICC3 | 1.2 | mA | ||
| Output Voltage Rise-Time | Tr | 40 | ns | ||
| Output Voltage Fall-Time | Tf | 20 | ns | ||
| Source Resistance | ROH | 13 | Ω | ||
| Sink Resistance | ROL | 5.5 | Ω | ||
| Dead Time | T_dead | 250 | 300 | 340 | ns |
Key Features
- High-Frequency Operation: The controller operates at frequencies from 50 kHz to 500 kHz, providing flexibility in design.
- High-Voltage Floating Driver: Supports bulk voltages up to 600 V, making it suitable for high-voltage applications.
- Adjustable Deadtime: Adjustable deadtime from 100 ns to 2 μs helps in reducing cross-conduction between the upper and lower transistors.
- Startup Sequence via Adjustable Soft-start: Ensures a smooth startup by gradually increasing the switching frequency to the programmed maximum value.
- Brown-out Protection: Simplifies PFC association by ensuring a clean startup sequence with soft-start.
- Fast and Slow Fault Detection: Includes both fast and slow fault inputs to handle different types of fault conditions.
- Broken Feedback Loop Detection: Detects and handles broken feedback loops, ensuring the controller stops all pulses and waits for the loop to be restored.
- Cumulative Fault Events: The timer capacitor integrates fault occurrences, allowing for adjustable auto-recovery retry rates.
- Internal Temperature Shutdown: Protects the device from overheating by shutting down the internal logic.
- Low Startup Current: Startup current of 300 μA minimizes power consumption during startup.
- Peak Current Drive Capability: 1 A / 0.5 A peak current sink/source drive capability.
Applications
- Flat Panel Display Power Converters: Suitable for powering flat panel displays due to its high reliability and safety features.
- High Power AC/DC Adapters for Notebooks: Ideal for high-power adapters requiring robust and efficient power conversion.
- Industrial and Medical Power Sources: Used in industrial and medical power supplies where high reliability and safety are critical.
- Offline Battery Chargers: Applicable in offline battery charging systems that require efficient and safe power conversion.
Q & A
- What is the operating frequency range of the NCP1396ADR2G?
The NCP1396ADR2G operates at frequencies from 50 kHz to 500 kHz.
- What is the maximum bulk 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 NCP1396ADR2G?
The deadtime is adjustable from 100 ns to 2 μs using a single resistor wired to ground.
- What is the purpose of the soft-start sequence in the NCP1396ADR2G?
The soft-start sequence ensures a smooth startup by gradually increasing the switching frequency to the programmed maximum value.
- How does the brown-out protection work in the NCP1396ADR2G?
The brown-out protection ensures a clean startup sequence with soft-start, stabilizing the PFC before energizing the resonant tank.
- What are the differences between the A and B versions of the NCP1396ADR2G?
The A and B versions differ in their startup thresholds; the A version starts at 13.3 V, while the B version starts at 10.5 V. The B version also activates soft-start upon release of the fast-fault input for any feedback conditions.
- How does the fast fault detection work in the NCP1396ADR2G?
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 either resumes operation without soft-start (A version) or through a regular soft-start sequence (B version).
- What is the purpose of the broken feedback loop detection in the NCP1396ADR2G?
The broken feedback loop detection stops all pulses if the feedback loop is broken and waits for the loop to be restored before attempting to restart.
- How does the cumulative fault events feature work in the NCP1396ADR2G?
The timer capacitor integrates fault occurrences, allowing for adjustable auto-recovery retry rates by adjusting the discharge rate of the capacitor.
- What is the maximum internal IC consumption of the NCP1396ADR2G?
The maximum internal IC consumption is 11 mA with a 1 nF output load at 300 kHz switching frequency.
