Rev. B 062011

22

LCS700-708

www.powerint.com

Parameter

Symbol

Conditions

SOURCE = 0 V; T

V

(Unless Otherwise Specified)

Min

Typ

Max

Units

LLC Oscillator (cont.)

I

Hysteresis

I

BURST(HYST)

I

5

6.25

8

% of I

DT/BF

DT/BF Voltage to

Program Burst Setting

V

BT1

Required V

setting BT1

93.5

95

96.3

% of V

REF

V

BT2

Required V

setting BT2

88.5

90

91.3

V

BT3

Required V

setting BT3

83.5

85

86.3

Time Constant for the

Combination of R

R

ling Cap on DT/BF

RC

DT/BF

This time constant must be less than the

specified maximum to ensure correct

setting of burst mode.

100

ms

FB Current Maximum

I

FB

Determines the maximum control

frequency that can be set by I

100

%I

DT/BF

FB Control

Current Range

I

FB

I

15

430

mA

FB Virtual Voltage

V

FB

FB input appears as R

V

0.65

V

FB Input Resistance

R

IN(FB)

FB input appears as R

V

2.5

kW

FB Input Resistance

During Soft-Start

R

FB(SS)

FB input appears as R

V

when OV/UV < V

750

W

Over-Current Protection

Fast Over-Current

Fault Voltage

V

IS(F)

0.855

0.905

0.955

V

Slow Over-Current

Fault Voltage

Threshold

V

IS(S)

7 LLC clock cycle debounce

0.455

0.505

0.555

V

Over-Current Fault

Pulse Width

t

IS

Minimum time V

cycle to trigger fault protection

30

ns

Over-Temperature Protection

Over-Temperature

T

OT

140

°C

NOTES:

A. Guaranteed by design.

B. Typical apparent dead-time at the HB pin under resonant ZVS conditions.

C. VCC/VCCH operating range to achieve power capabilities specified in data sheet power table.