0

100

200

300

400

500

600

LOAD CURRENT (mA)

50

60

70

80

90

100

12V

30V

5

8 10

15

20

25

30

350

300

250

200

150

Load Curent = 400 mA

FB

SW

L1

R1

2.5k

LM2694

BST

VCC

C3

C4

D1

ISEN

SGND

SS

RTN

0.1 PF

5V

GND

0.022 PF

R2

2.5k

R3

1.5

C2

22 PF

C6

0.022 PF

C1

3.3 PF

C5

0.1 PF

140k

150 PH

8V - 30V

Input

VIN

RON/SD

LM2694

SNVS444A – MAY 2006 – REVISED APRIL 2013

www.ti.com

FINAL CIRCUIT

The final circuit is shown in Figure 14, and its performance is shown in Figure 15 and Figure 16. Current limit

measured approximately 0.64A.

Figure 14. Example Circuit

Item

Description

Value

C1

Ceramic Capacitor

3.3 µF, 50V

C2

Ceramic Capacitor

22 µF, 16V

C4, C6

Ceramic Capacitor

0.022 µF, 16V

C3, C5

Ceramic Capacitor

0.1 µF, 50V

D1

Schottky Diode

60V, 1A

L1

Inductor

150 µH

R1

Resistor

2.5 k

Ω

R2

Resistor

2.5 k

Ω

R3

Resistor

1.5

Ω

Resistor

140 k

Ω

U1

TI Semi LM2694

Circuit of Figure 14

Circuit of Figure 14

14

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