HS01G datasheet(10/18 Pages) INFINEON

10 / 18 page

Version 2.0

24 August 2009

Half-Bridge Resonant Controller

ICE1HS01G

Functional description

current source Ihys connected between VINS and

Ground, an adjustable hysteresis between the on and

off input voltage can be created as

[4]

The mains input voltage is divided by RINS1 and RINS2 as

shown in the typical application circuit. A current source

Ihys is connected from VINS pin to ground in the IC. If

the on and off threshold for mains voltage is Vmainon and

Vmainoff, the resistors can be decided as

[5]

[6]

3.7

Over load protection

In case of open control loop or output over load fault,

the FB voltage will increase to its maximum level. If FB

voltage is higher than VFBH and this condition last

longer than a fixed blanking time of TOLP (20ms), the IC

will start the extended blanking timer. The extended

blanking timer is realized by charging and discharging

the filter capacitor CFB via the pull up resistor RFB and

QFB. The circuit for extended blanking timer is shown in

Figure 11.

Figure 11

Circuit connected to FB pin

The FB voltage waveform during a OLP period is

shown in Figure 12. After FB voltage has been higher

than VFBH for the fixed blanking time t1 shown in Figure

11, IC will use internal switch QFB to discharge VFB to

VFBL. After the switch QFB is released, CFB will be

charged up by Vdd through RFB. The time needed for

CFB being charged to VFBH can be calculated as

[7]

If CFB is 10nF, the time is about 439us. After VFB

reaches VFBH, an internal counter will increase by 1 and

the capacitor is discharged to 0.5V by QFB again. The

charging and discharging process of CFB will be

repeated for NOLP_E times if the fault condition still exist.

After the last time of NOLP_E the FB voltage is pulled

down to zero, IC will stop the switch when FB voltage

rises to VFBH again. This is called over load/open loop

proteciton. During the charging and discharging period,

the IC will operate with frequency determined by Ichg_min

and ICS.

Figure 12

FB voltage waveform during over load

protection

If the converter returns to normal operation during the

extended blanking time period, FB voltage can not

reach VFBH again. Therefore, after FB voltage is

discharged to zero voltage, if it can not reach VFBH

within TOLP_R, IC will reset all the fault timer to zero and

return to normal operation.

After IC enters into OLP, both switches will be stopped.

However, the IC remains active and will try to start with

soft start after an adjustable period. This period is

realized by charging and discharging the capacitor CINS

connected to VINS pin for NOLP_R times. The time is

therefore determined by the capacitor CINS and resistor

RINS1 and RINS2. The circuit implementation of the

adjustable off time is shown in Figure 13 and Figure 14

shows the voltage waveform of VINS in this case.

As shown in Figure 14, the CINS is discharged to VINS_L

when IC enters into OLP at time t1. After that, an

internal constant current source IINST is turned on to

charge CINS. Once the voltage on VINS is charged to

VINS_H, the current source will be turned off and CINS is

discharged by another switch Q3 to VINS_L again. The

charging and discharging of CINS is thought as one

cycle. The cylce time is also influenced by the bus

VHYS

RINS1 Ihys

⋅

RINS1

Vmainon Vmainoff

–

Ihys

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

RINS2

RINS1

VINSON

Vmainoff VINSON

–

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

⋅

1.0V

IFB

Vdd

RFB

CFB1

4.5V

TOLP

24ms

CFB3

CFB2

EnA

0.5V

QFB

CLK

OLP

Reset

TOLP_R

1.2ms

CFB4

EnA

CFB5

EnA

0.8V

0.5V

R Q

Gate_off

Iref

AR_R

ICE1HS01G

tchg

Vdd V

–

FBH

Vdd VFBL

–

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





–RFB CFB

⋅⋅

Time

4.5V

0.5V

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