11

SCD5031 Rev B

Pre

lim

in

ar

y

FIGURE 6 – Current Sense Circuit

Error

1.4V

1V

Current

Comparators

2R

R

Amp

2

10

8

12

11

2.5V

COMP

CURRENT

SENSE

GND

R

C

Sense

S

R

Q

Q

Peak Current (Is) is determined by the formula:

A small RC filter may be required to suppress switch transients

I

S

MAX

1.0V

R

S

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

=

or

I

S

MAX

V

SOFT

1.4

–

3R

S

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

=

FIGURE 7 – Error Frequency Amplifier Open-Loop Response

at +125°C & -55°C

Gain

Frequency Hz

dB

120

80

40

0

-40

10

100

1K

10K

100K

1M

10M

1

+125°C

-55°C