HS01G datasheet(7/18 Pages) INFINEON

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Version 2.0

24 August 2009

Half-Bridge Resonant Controller

ICE1HS01G

Functional description

The controller ICE1HS01G with two gate outputs is

specially designed for LLC resonant half-bridge

converters. An oscillator with accurately-programmed

frequency range is built inside the IC. The two gate

signals are obtained by passing the signal out from the

oscillator through a divide-by-two flip-flop. Therefore,

two signals are of exactly 50% duty cycle and 180o out

of phase. To guarantee the zero-voltage-switching and

safe operation in half-bridge topologies, a fixed dead

time of 380ns is inserted in each internal when one

switch is turned off and the other is turned on.

For LLC resonant half-bridge converter, the output

voltage is regulated by changing the switching

frequency. ICE1HS01G offers the designer to choose

suitable operation frequency range by programming

the oscillator with one single resistor.

In addition, ICE1HS01G offers a programmed soft-start

function to limit both the inrush current and the

overshoot in output voltage.

To protect the system during operation, mains input

under-voltage protection and over-current protection

are integrated in ICE1HS01G as well.

3.1

Oscillator and Pulse Frequency

Modulation

The oscillator is programmed with only one external

resistor RFMIN connected to FMIN pin. The trimmed

capacitor CFS is built inside the IC with high accuracy.

The simplified oscillator circuit is shown in Figure 3.

Figure 3

Simiplified oscillator circuit

The charge current Ichg is sum of four currents which

are Ichg_min, IFB, ICS and ISS.

[1]

Everytime the capacitor CFS is charged by Ichg to VCH,

the upper switch is turned off and CFS will be

discharged through Idisc. The charge time determines

the on time for gate signal. The discharge time

determines the dead time during transition from one

gate off to another gate on. The switching waveforms

of the oscillator and gate signals are shown in Figure 4.

Figure 4

Oscillator waveforms

According to Figures 3 and 4, the on time of each gate

can be obtained as

[2]

The switching frequency can be obtained as

[3]

where the dead time Td is fixed as 380ns.

3.1.1

Minimum charge current

The voltage on pin FMIN is a constant of 1.5V during

normal operation. The resistor RFMIN determines the

current(IFMIN) flowing out from FMIN pin. Around one-

tenth of IFMIN is defined as the minimum charging

current(Ichg_min), which in turn defines the minimum

switching frequency as follows.

CO2

CO1

VCH

VCL

FMIN

CF1

Vdd

QF1

Ichg_min

CFS

Idisc

1.5V

RFMIN

QF2

QF3

Ichg

IFB

ICS

ISS

ICE1HS01G

Ichg

Ichgmin IFB Ics Iss

VCF

Vdelay

VLG

VHG

10V

Ton

3CFS

Ichg

------------

3CFS

Ichg

------------Td





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