Rev. G 05/17

22

LCS700-708

www.power.com

Parameter

Symbol

Conditions

SOURCE = 0 V;

T

J = -40 °C to 125 °C

(D)

V

CC = 12 V, VCCH = 12 V

(Unless Otherwise Specified)

Min

Typ

Max

Units

LLC Oscillator (cont.)

I

FB Threshold to Stop

LLC Switching

I

STOP1

Threshold applies after exiting soft-start mode

for burst setting BT1

52.0

% of I

DT/BF

I

STOP2

Threshold applies after exiting soft-start mode

for burst setting BT2

46.0

I

STOP3

Threshold applies after exiting soft-start mode

for burst setting BT3

39.0

I

FB Threshold

Hysteresis

I

BURST(HYST)

I

START is IBURST(HYST) below ISTOP

5

6.8

8

% of I

DT/BF

DT/BF Voltage to

Program Burst Setting

V

BT1

Required V

DT/BF at start-up to enable burst

setting BT1

93.5

95

96.3

% of V

REF

V

BT2

Required V

DT/BF at start-up to enable burst

setting BT2

88.5

90

91.3

V

BT3

Required V

DT/BF at start-up to enable burst

setting BT3

83.5

85

86.3

Time Constant for the

Combination of R

FMAX,

R

BURST and the Decoup-

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

Feedback Current

Maximum

I

FB

Determines the maximum control

frequency that can be set by I

FB

100

%I

DT/BF

Feedback Control

Current Range

I

FB

I

FB is limited by the current into DT/BF

15

430

mA

Feedback Virtual

Voltage

V

FB

FB input appears as R

IN(FB) in series with VFB,

30 mA < I

FB < IDT/BF

0.65

V

Feedback Input

Resistance

R

IN(FB)

FB input appears as R

IN(FB) in series with VFB,

30 mA < I

FB < IDT/BF

2.5

kW

Feedback Input

Resistance During

Soft-Start

R

FB(SS)

FB input appears as R

FB(SS) in series with VREF

during the soft-start delay interval or when

OV/UV < V

SD or OV/UV > VOV

750

W

Over-Current Protection

Fast Over-Current Fault

Voltage

Threshold4

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

IS exceeds VIS(F)/VIS(S) per cycle

to trigger fault protection

30

ns

Over-Temperature Protection

Over-Temperature

Shutdown ThresholdA

T

OT

125

°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.

D. Operation possibly limited by over-temperature shutdown.