M62212P 参数 Datasheet PDF下载

M62212P/FP/GP

Constant Definition

Constant

T

ON

T

OFF

T

ON

+

T

OFF

Step-down Circuit

V

O

+

V

F

V

IN

−

V

CE (sat)

−

V

O

1

fosc

T

ON

+

T

OFF

Step-up Circuit

V

O

+

V

F

−

V

IN

V

IN

−

V

CE (sat)

1

fosc

T

ON

+

T

OFF

1

+

1

fosc

T

ON

T

OFF

−

T

OFF

Inverse Polarity Circuit

V

O

 +

V

F

V

IN

−

V

CE (sat)

1

fosc

T

ON

+

T

OFF

1

+

1

fosc

T

ON

T

OFF

−

T

OFF

T

OFF (MIN)

1

+

1

fosc

T

ON

T

OFF

−

T

OFF

T

ON (MAX)

D

(MAX)

C

OSC

T

ON (MAX)

T

ON

+

T

OFF

1

−12

75

×

10

3

×

fosc

−

16

×

10

(V

IN

−

V

CE (sat)

−

V

O

)

×

T

ON (MAX)

∆I

O

V

O

V

REF

Not use short

protection

Use short

protection

−

1

×

R

2

T

ON (MAX)

T

ON

+

T

OFF

1

−12

75

×

10

3

×

fosc

−

16

×

10

(V

IN

−

V

CE (sat)

)

2

×

T

ON (MAX)2

×

fosc

2

×

V

O

×

I

O

V

O

V

REF

−

1

×

R

2

T

ON (MAX)

T

ON

+

T

OFF

1

−12

75

×

10

3

×

fosc

−

16

×

10

(V

IN

−

V

CE (sat)

)

2

×

T

ON (MAX)2

×

fosc

2

×

V

O

×

I

O

V

O



V

REF

−

1

×

R

2

L

(MIN) *1

R

1 *2, *3

R

DTC *4

V

DTC (MAX)

I

CH1



V

DTC (MAX)

I

CH2



I

CH1

 ×

tstart

V

DTC (MAX)

I

DIS1

×

tshort

V

DTC (MAX)

−

V

OSCL

V

DTC (MAX)

I

CH1



V

DTC (MAX)

I

CH2



I

CH1

 ×

tstart

V

DTC (MAX)

I

DIS1

×

tshort

V

DTC (MAX)

−

V

OSCL

V

DTC (MAX)

I

CH1



V

DTC (MAX)

I

CH2



I

CH1

 ×

tstart

V

DTC (MAX)

I

DIS1

×

tshort

V

DTC (MAX)

−

V

OSCL

C

DTC *4

Calculate from

start-up time

Calculate from

shat down time

note:

V

F

: Forward voltage of outer diode.

V

CE (sat)

: Saturation voltage of M62212 or saturation voltage of current buffer transistor

Please setting the oscillation frequency first and calculate each constant value.

1. Please setting

∆I

O

about 1/3 to 1/5 of maximum output current

2.

|V

O

| = (1 +

R1 )

×

V

REF

R2

3. Please setting R2 about few kΩ to score fo kΩ because output voltage don’t undergo a influence of input

current (Terminal 7)

4. Please setting V

DTC (MAX)

to satisfy D

(MAX)

, fixed from characteristics of D

(MAX)

−

V

DTC (MAX)

. I

CH1

means DTC

charge current when start-up (−45

µA

typ), I

CH2

means DTC charge current when stable state (−10

µA

typ),

V

OSCL

means lower limit voltage of oscillation waveform (0.45 V typ), and I

DIS1

means DTC discharge current

1 (50

µA

typ).

t

start

means time interval when terminal voltage of DTC increase to V

OSCL

from lower voltage and to start

switching at first.

t

short

means time interval when output is shut down after output is shorted

Rev.2.00 Jun 14, 2006 page 7 of 8