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NCP1396AG / NCP1396BG SOP-15 LLC Resonant Half-Bridge Controller IC
NCP1396AG / NCP1396BG SOP-15 LLC Resonant Half-Bridge Controller IC
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NCP1396AG / NCP1396BG — SOP-15 LLC Resonant Half-Bridge Controller IC
The NCP1396 is ON Semiconductor's dedicated LLC resonant half-bridge controller IC in SOP-15 package. It provides variable-frequency control for LLC resonant converters with integrated 600V high-side and low-side gate drivers, making it the preferred controller for high-efficiency SMPS designs in LCD TVs, server power supplies, and industrial converters. This listing covers both NCP1396AG and NCP1396BG variants.
Key Specifications
| Parameter | Value |
|---|---|
| Part Numbers | NCP1396AG / NCP1396BG |
| Package | SOP-15 |
| Topology | LLC Resonant Half-Bridge |
| Control Method | Variable Frequency (VFO) |
| Gate Driver Output | 600V, 250mA source / 500mA sink |
| Frequency Range | 50kHz – 500kHz |
| Min. Frequency Clamp | Programmable (fmin pin) |
| Max. Frequency Clamp | Programmable (fmax pin) |
| Soft Start | Built-in (programmable) |
| Protections | OVP, OCP, OTP, latch-off |
| Vcc Range | 12V – 20V |
| Operating Temperature | -40°C to +125°C |
NCP1396AG vs NCP1396BG
| Feature | NCP1396AG | NCP1396BG |
|---|---|---|
| OCP Response | Frequency fold-back | Latch-off |
| Fault Recovery | Auto-restart | Manual reset required |
| Best For | Consumer SMPS (auto-recovery) | Industrial (latched protection) |
Why Choose NCP1396?
- ✅ Integrated 600V gate drivers — no external gate driver ICs needed
- ✅ Variable frequency control — optimal efficiency across full load range
- ✅ Programmable fmin/fmax — prevents operation outside safe frequency range
- ✅ Comprehensive protection — OVP, OCP, OTP with latch-off or auto-restart
- ✅ Industry-standard LLC controller — widely used in LCD TV and server PSU designs
Compatible With / Works With
- LLC resonant half-bridge SMPS (100–500W output)
- LCD TV main power supply board (32–65" panels)
- Server power supply unit (ATX12V, EPS12V)
- Half-bridge MOSFETs: STF13NM60N, SPA11N65C3, IPP60R099CP
- Resonant tank: Lr + Cr + Lm (series-parallel LLC network)
Typical Applications
- LCD TV Power Supply — primary LLC resonant stage in 32–65" TV SMPS
- Server PSU — high-efficiency LLC stage in 80 PLUS Gold/Platinum server supply
- Industrial SMPS — isolated 48V/24V/12V converter with LLC topology
- EV Onboard Charger — LLC resonant stage in 3.3kW–6.6kW OBC
- Telecom Rectifier — 48V DC bus LLC converter for telecom power systems
FAQ
Q: What is the difference between LLC and flyback topology?
A: LLC resonant converters achieve ZVS (Zero Voltage Switching) for the primary MOSFETs and ZCS (Zero Current Switching) for the secondary diodes, dramatically reducing switching losses. LLC is preferred for >100W designs where efficiency is critical. Flyback is simpler and preferred for <100W.
Q: How do I diagnose a failed NCP1396 in an LCD TV PSU?
A: Check Vcc pin (should be 15–18V). Verify gate drive outputs (HO, LO) for switching waveforms. If Vcc is present but no gate drive, the IC or its protection latch may be triggered. Check OVP/OCP sense pins for fault conditions.
Q: Can NCP1396AG replace NCP1396BG?
A: Yes in most consumer applications. NCP1396AG auto-restarts after fault; NCP1396BG latches off. In LCD TV repair, NCP1396AG is generally preferred for auto-recovery behavior.
Package Contents
- NCP1396AG or NCP1396BG SOP-15 LLC Resonant Half-Bridge Controller IC (variant per selection)
