10

LTC4403-1/LTC4403-2

4403f

APPLICATIO S I FOR ATIO

*LTC4403-X Low Frequency AC Spice Model*

*Main Network Description

GGIN1 ND3 0 ND2 IFB 86E-6

GGXFB IFB 0 0 ND12 33E-6

GGX5 ND11 0 0 ND10 1E-6

GGX6 ND12 0 0 ND11 1E-6

GGX1 ND4 0 0 ND3 1E-6

GGX2 ND6 0 0 ND4 1E-6

GGX3 ND7 0 0 ND6 1E-6

GGX4 ND8 0 0 ND7 1E-6

EEX1 ND9 0 0 ND8 2

CCC1 ND3 0 75E-12

CCPCTL2 ND2 0 7E-12

CCPCTL1 ND1 0 13E-12

CCLINT VPCA 0 5E-12

CCLOAD VPCA 0 33E-12

CCFB1 IFB 0 2.4E-12

CCX5 ND11 0 16E-15

CCX6 ND12 0 2E-15

CCP ND10 0 28E-12

CCX2 ND6 0 16E-15

CCX3 ND7 0 32E-15

LLX1 ND5 0 65E-3

RR01 ND3 0 20E6

RRFILT ND2 ND1 44E3

RRPCTL1 PCTL ND1 51E3

RRPCTL2 ND1 0 38E3

Figure 6. LTC4403-X Low Frequency AC SPICE Model

RR9 VPCA ND9 50

RRLOAD VPCA 0 400

RRFB1 IFB 0 22E3

RRT RF 0 250

RRX5 ND11 0 1E6

RRX6 ND12 0 1E6

RRSD RF ND10 500

RRX1 ND4 ND5 1E6

RRX2 ND6 0 1E6

RRX3 ND7 0 1E6

RRX4 ND8 0 1E6

**Closed loop feedback, comment-out VPCTL, VRF, Adjust EFB gain

to reflect external gain, currently set at 3X**

*EFB RF 0 VPCA VIN 3

*VIN VIN 0 DC 0 AC 1

*VPCTL PCTL 0 DC 0

**Open loop connections, comment-out EFB, VIN and VPCTL******

VPCTL PCTL 0 DC 0

VRF RF 0 DC 0 AC 1

******Add AC statement and print statement as required***

.AC DEC 50 10 1E7

*****for PSPICE only*****

.OP

.PROBE

*************************

.END

Figure 7. LTC4403 Low Frequency AC Model

RO1

20E6

ND3

ND2

ND1

GIN1

86E-6

IFB

GX1

1E-6

GX2

1E-6

GX3

1E-6

GX4

1E-6

CC1

75E-12

38E3

51E3

44E3

RX1

1E6

ND4

RX2

1E6

ND6

ND5

RX3

1E6

ND7

CX3

32E-15

RX4

1E6

400

Ω

ND8

–

+

CX2

16E-15

–

+

RX5

1E6

ND11

ND10

CX5

16E-15

–

+

RSD

500

Ω

RT

250

Ω

CP

28E-12

RX6

1E6

ND12

CX6

2E-15

–

+

–

+

–

+

4403 F07

–

+

–

+

–

+

RFB1

22E3

GM

GM

GM

GM

GM

GX5

1E-6

GM

GX6

1E-6

GM

GXFB

33E-6

GM

EX1

PCTL

RF

7E-12

13E-12

CFB1

2.4E-12

2

ND9

ND8

2X BUFFER

5E-12

33E-12

R9

50

Ω

LX1

65E-3