ACT6390MH-T datasheet(6/11 Pages) ACTIVE-SEMI

Part #	ACT6390MH-T

Description	1.7A/2.5A PWM Step-Up DC/DC Converters In MSOP

Download	11 Pages

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Manufacturer	ACTIVE-SEMI [Active-Semi, Inc]

Direct Link	http://www.active-semi.com

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6 / 11 page

ACT6390/ACT6391

Rev PrA, 01-Sep-07

Innovative Products. Active Solutions.

- 6 -

www.active-semi.com

(9)

(11)

Inductor Selection

As a step-up converter, the switch duty cycle (D) is

determined by the input voltage (VIN) and output

voltage (VOUT), as given by the following formula:

Define

Where: ∆IL is the inductor ripple current in steady

state, typically chosen to be about 0.3, and

IL(DC) is the inductor DC current, given by:

Where

η is typical efficiency.

Solving equations (3),(4),(5) and (6) for the inductor

value,

This equation can be used to determine the correct

trade-off between efficiency, current ripple, size and

cost.

When selecting an inductor make sure that the in-

ductors maximum DC current and saturation current

exceed the maximum operation point, calculated

by:

and

If the output voltage is greater than two times of

input voltage, that means the duty cycle is greater

than 50%, the slope compensation is required for

stability. When operating in this condition ensure

that the inductor value is greater than LMIN:

Where RCS is the current sense trans-resistance,

RCS is 0.45Ω for ACT6390, and RCS = 0.3Ω for

ACT6391.

For example: VIN = 3.3V, VOUT = 12V, fSW = 700kHz

IOUT = 250mA, η = 85%, FREQ = G, K = 0.4

Select L = 10µH

Assuming the minimum input voltage is 3V and low

cost external components are used, yielding a low

efficiency of just 80%.

For stability,

Which meets the slope compensation requirement.

Loop Compensation

The ACT6390 and ACT6391 feature a simple loop

compensation scheme. Simple follow the procedure

detailed below to determine suitable compensation

components. For best results be sure to prototype

to confirm the values, and adjust the compensation

network (by inspecting the transient response, for

example) as needed to optimize results for your

particular application.

When the converter operates with continuous in-

ductor current, a right-half-plane zero exits in the

loop’s gain-frequency response. To ensure stability,

OUT

IN

OUT

V

D





(3)

(4)

SW

IN

L

f

L

D

V

DT

L

V

I

Δ





(5)

(6)

 

η

V

I

V

I

IN

OUT

DC

L















 η

V

I

MIN

IN

OUT

MAX

OUT

MAX

,

DC

L





(8)

(12)

(15)

(10)





SW

CS

IN

OUT

MIN

f

75

.

1

R

V

L













DC

L

I

Δ

K



(7)





K

η

f

I

V

L

SW

OUT

IN

OUT

2

OUT

IN



















(14)





A

41

.

1

A

32

.

0

2

1

A

25

.

1

I

MAX

PEAK







































SW

OUT

MIN

IN

OUT

MIN

IN

MIN

IN

OUT

MAX

OUT

MAX

L

MAX

,

DC

L

MAX

,

PEAK

L

f

L

V

2

1

η

V

I

Δ

2

1

I

















H

μ

99

.

7

4

.

0

85

.

0

kHz

700

mA

250

V

3

.

3

V

12

V

12

V

3

.

3

K

η

f

I

V

L

2

SW

OUT

IN

OUT

2

OUT

IN





































































A

25

.

1

8

.

0

V

3

V

12

mA

250

I

MAX

,

DC

L







(13)









A

32

.

0

kHz

700

H

μ

10

V

12

V

3

V

12

V

3

I

Δ

MAX

L















H

μ

2

.

3

kHz

700

75

.

1

Ω

45

.

0

V

3

.

3

V

12

L

MIN









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