LTC2970 datasheet(32/36 Pages) LINER

部件名	LTC2970

功能描述	Dual I2C Power Supply Monitor and

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制造商	LINER [Linear Technology]

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32 / 36 page

LTC2970/LTC2970-1

32

29701fc

APPLICATIO S I FOR ATIO

VV

R

VmV

DC MAX

DC NOM

FB

00

0

20

30

10

,,

>+

•

−

()

→>

+

•

−

()=

VV

k

VmV

DC MAX

0

2 631

10

768

08

10

36

,

.

..

Ω

6

60V

From Equation 7, the margining resolution will be less

than:

V

R

RA

k

RES <

••

=

••

20

30

40 276

256

10

768

665

μ

Ω

.

2

276

256

933

μA

= . mV/LSB

Margining DC/DC Converter with TRIM Pin Design

Example

The output voltage of the DC/DC converter in Figure 2 needs

to be margined ±10% about its nominal value. Assume

that RTRIM = 10.22kΩ and VREF = 1.225V.

1. Solve for R30 using Equation 10:

RR

k

TRIM

DOWN

30

50

10 22

50

≤

−

⎛

⎝⎜

⎞

⎠⎟

=

−

•

%

.•

Δ

Ω

1

10

40 880

⎛

⎝⎜

⎞

⎠⎟

= ,

Ω

Let R30 = 39.2kΩ.

2. Solve for R40 using Equations 11:

R

V

A

UP

DOWN

REF

40

1

236

1

10

≥+

Δ

⎛

⎝⎜

⎞

⎠⎟

=+

⎛

⎝⎜

⎞

%

•

μ

⎠⎠⎟

=

•

.

,

1 225

236

10 381

V

A

μ

Ω

Let R40 = 10.5kΩ.

Tracking Application Circuit Design Example

Consider the LTC2970-1 application circuit shown in Figure

3. Channel 0 is a 1.8V DC/DC converter while channel 1

is a 2.5V switching power supply. Both converters have

a feedback node voltage of 0.8V and need to track on and

off coincidentally. In addition, a margin range of +5% and

–10% is required for each supply.

1. Assume a value for R20 and solve for R21.

Let R20 = 5,970Ω. From Equation 12:

RR

V

DC NOM

21

20

5 970

25

18

8

1

0

=•

=

•

=

,

.

,

Ω

2

292

Ω

Let R21 = 8,250Ω (the nearest E192 Series resistor

value).

2. Solve for R10 and R11.

From Equation 13:

R

V

DC NOM

FB

10

20

1

5 970

18

08

0

=

−

⎛

⎝⎜

⎞

⎠⎟

=

−

,

.

Ω

1

4 776

⎛

⎝⎜

⎞

⎠⎟

= ,

Ω

R

V

DC NOM

FB

11

21

1

8 250

25

08

1

=

−

⎛

⎝⎜

⎞

⎠⎟

=

−

,

.

Ω

1

3 882

⎛

⎝⎜

⎞

⎠⎟

= ,

Ω

Let R10 = 4,750Ω and R11 = 3,880Ω.

3. Solve for R40 and R41.

Assume that R40 = R41.

RR

V

VV

FB

DC NOM

DC MIN

DC MAX

D

40

41

=≥

•

−

()

−

n

nn

n

,,

,

C

C NOM

mV

A

V

n,

.

(. )

(

()

+

⎛

⎝

⎜

⎞

⎠

⎟

+

=

•

−

110

236

08

10 9

μ

1

105 1

110

236

10 212

.)

,

−

+

⎛

⎝⎜

⎞

⎠⎟

+

=

mV

A

μ

Ω

Let R40 = R41 = 10.5kΩ

类似零件编号 - LTC2970

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