LZC3103

LZC3103 is a high performance, resonant mode double-ended controller specific for DCDC application using LLC half-bridge resonant converter.

18681585060

產(chǎn)品詳情

Typical Application

General Description

LZC3103 is a high performance, resonant mode double-ended controller specific for DCDC application using LLC half-bridge resonant converter. It provides 50% complementary duty cycle: the high-side switch and the low-side switch are driven on/off 180° out-of-phase for exactly the same time. The controller modulates the operation frequency to perform output voltage regulation. A novel method of MOSFETS zero voltage detection and adaptive deadtime inserted between the turn-off of either MOSFET and the turn-on of the other one, which can guarantee the soft-switching, low EMI emissions and high efficiency. LZC3103 provides process of soft-start, which make the switching frequency starts from a preset maximum value and then decays to the steady-state value determined by the control loop, to prevent hard-switchingduring start up. Programable burst-mode control with no or very light load，which can minimizing magnetizing current losses and frequency-related losses, to realized energy saving specifications. The special function of current foldback with temperature is to keep the system working in high temperature environment. This highly integrated controller implements frequency modulation control with SOP16 package, it simplifies the system design. The internal oscillator supports the switching frequencies from 40kHz to 400kHz. The LZC3103 provides complete system protection functions including capacitive-mode detection, half-bridge line under voltage protection, load over current protection (OCP), VCC under voltage lock-out(UVLO), VCC over voltage protection, and over temperature protection.

Main Features

Symmetrical duty cycle, variable frequency control of LLC converter

High accuracy oscillator

Adaptive dead-time for best efficiency

Programable soft-start

Programable minimum and maximum work frequency

Primary-side constant current mode

Capacitive-mode detection

Burst-mode for light load

Programmable current foldback function

Provides complete protection functions:

? Input under voltage protection