12

HIP6521 DC-DC Converter Application Circuit

Figure 9 shows an application circuit of a power supply for a

microprocessor computer system. The power supply provides

circuit, including a Bill-of-Materials and circuit board description,

see Application Note AN9908. Also see Intersil’s web page

(www.intersil.com) or Intersil AnswerFAX (321-724-7800)

Document No. 99908 for the latest information.

GND

VCC

PGND

LGATE

UGATE

OCSET

PHASE

FB

COMP

FB2

DRIVE2

Q3

DRIVE3

FB3

DRIVE4

C16

C13

C9-12

HIP6521

Q4

L2

+

+

+

+

C4

L1

C1-3

C6

C5

R1

R6

C14

C15

1000

µF

1000

µF

C8

330

µF

1.2

µH

3x1200

µF

1

µF

1

µF

1000pF

4x1000

µF

2

.5µH

10pF

22nF

1.50K

GND

(2.5V)

(1.8V)

(1.5V)

FB4

R8

698

R7

45.3K

12K

Q5

U1

1

2

13

14

5

15

16

4

3

12

9

10

6

8

11

(2.5V)

FIGURE 9. POWER SUPPLY APPLICATION CIRCUIT FOR A MICROPROCESSOR COMPUTER SYSTEM

Q1,2

HUF76129D3S

FZT649

2SD1802

2SD1802

+

R3

R2

5.90K

12.7K

R5

R4

9.09K

7.15K

R10

R9

7.50K

8.45K

BOOT

7

C7

0.47

µF

D1

MA732

S3

S5

To FB2

To FB4

To OCSET

HIP6521