10

LNK562-564

F

10/05

Parameter

Symbol

Conditions

SOURCE = 0 V; T

See Figure 7

(Unless Otherwise Specified)

Min

Typ

Max

Units

OUTPUT (cont.)

FEEDBACK Pin

Auto-Restart

Threshold Voltage

V

FB(AR)

T

0.8

V

Auto-Restart

ON-Time

V

T

100

ms

Auto-Restart

Duty Cycle

DC

AR

12

%

NOTES:

A. In a scheme using a resistor divider network at the FB pin, where R

bias voltage and R

by V

can be used:

To determine the contribution from I

Since I

.

B. Total current consumption is the sum of I

switching) and the sum of I

C Since the output MOSFET is switching, it is difficult to isolate the switching current from the supply current at the

DRAIN. An alternative is to measure the BYPASS pin current at 6 V.

D. See Typical Performance Characteristics section Figure 15 for BYPASS pin start-up charging waveform.

E. This current is only intended to supply an optional optocoupler connected between the BYPASS and FEEDBACK

pins and not any other external circuitry.

F. This parameter is guaranteed by design.

G. This parameter is derived from characterization.

H. Breakdown voltage may be checked against minimum BV

exceeding minimum BV

V

R

RR

IR

V

R

RR

IR

x

100

1

()

()

()

(

)

FB TYP

L

UL

FB TYP

U

FB MAX

L

UL

FB TYP

U

#

=

+

+

+

+

-

J

L

K

K

KK

b

b

N

P

O

O

OO

l

l

V

R

RR

IR

V

R

RR

IR

y

100

1

()

()

()

(

)

FB TYP

L

UL

FB TYP

U

FB TYP

L

UL

FB MAX

U

#

=

+

+

+

+

-

J

L

K

K

KK

b

b

N

P

O

O

OO

l

l

xy

22

!

+