ZXRE060

0.6V ADJUSTABLE PRECISION SHUNT REGULATOR

ZXRE060

Document number: DS33611 Rev. 6 - 2

8 of 12

www.diodes.com

March 2011

© Diodes Incorporated

A Product Line of

Diodes Incorporated

Figure 7. 1V Current-boosted shunt regulator

⎟

⎠

⎞

⎜

⎝

⎛ +

=

2

R

1

R

1

REF

V

OUT

V

(

BE

V

V

2

.

0

OUT

V

+

≥

)

3

R

I

OUT

V

IN

V

3

R

−

=

Design guides

1.

2.

)

1

(min)

FE

h

(

(max)

OUT

I

B

I

+

=

3.

(max)

OUT

I

3

R

I

=

4.

Determine R3 from

3

R

I

OUT

V

IN

V

3

R

−

=

5.

It is best to let the ZXRE060 supply as much current as it can before bringing Q1 into conduction. Not

only does this minimise the strain on Q1, it also guarantees the most stable operation. Choose a nominal

6.

Calculate R4 from

4

R

I

BE

V

4

R

=

Figure 8. 1.15V over-voltage indicator

⎟

⎠

⎞

⎜

⎝

⎛ +

>

2

R

1

R

1

REF

V

M

V

3

R

I

)

2

.

0

F

V

(

IN

V

3

R

+

−

=

)

MAX

(

F

I

3

R

I

mA

15

≤

≥