IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

© 2000 IMP, Inc.

PWM Controllers

5

Electrical Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Current Sense

Gain

Notes 1, 2 and 3

2.90

3.00

3.10

V/V

Over Current Protection Threshold

Vcomp = max, Note 2

0.9

0.98

1.1

V

Power Supply Rejection Ratio

PSRR

70

dB

Input Bias Current

– 0.1

– 2.0

µA

Delay to Output

50

65

ns

Output

IMP38C4x

ON Resistance, High

20

Ω

ON Resistance, Low

11

IMP38HC4x

ON Resistance, High

10

Ω

ON Resistance, Low

5.5

Peak Drive Current

HC devices

1.0

A

H devices

0.5

IMP38C4x Rise Time

40

70

ns

IMP38C4x Fall Time

30

50

ns

IMP38HC4x Rise Time

20

50

ns

IMP38HC4x Fall Time

15

40

ns

Shoot-through Current

0mA

Undervoltage Lockout

Start Threshold

IMP38C42/4, IMP38HC42/4

13.5

14.5

15.5

V

IMP38C43/5, IMP38HC43/5

7.8

8.4

9.0

Minimum Operating Voltage

IMP38C42/4, IMP38HC42/4

8

9

10

V

IMP38C43/5, IMP38HC43/5

7.0

7.6

8.2

Pulse Width Modulator

Maximum Duty Cycle

IMP38C42/3, IMP38HC42/3,

94

96

%

Maximum Duty Cycle

IMP38C44/5, IMP38HC44/5

48

50

%

Minimum Duty Cycle

0%

Supply Current

Start-Up Current

95

120

µA

Operating Current

0.5

1.5

mA

specifications indicate enhanced performance features.

Note 1. Guaranteed by design. Not 100% tested in production.

Note 3. Gain is defined as:

s

d

l

o

h

s

e

r

h

T

O

L

V

U

e

l

c

y

C

y

t

u

D

V

4

.

8

t

a

p

u

-t

r

a

t

S

V

6

.

7

=

m

u

m

i

n

i

M

g

n

i

t

a

r

e

p

O

V

5

.

4

1

t

a

p

u

-t

r

a

t

S

V

0

.

9

=

m

u

m

i

n

i

M

g

n

i

t

a

r

e

p

O

%

6

9

o

t

%

03

4

C

H

/

3

4

C

8

3

P

M

I2

4

C

H

/

2

4

C

8

3

P

M

I

%

0

5

o

t

%

05

4

C

H

/

5

4

C

8

3

P

M

I4

4

C

H

/

4

4

C

8

3

P

M

I

s

p

e

.

3

0

t

_

C

H

/

C

8

3

Table 1. Startup and Operating Voltage Selection Guide

A

V

V

, 0

V

0.8V

COMP

CS

CS

=≤

≤

∆

∆

Note 5. Output frequency equals the oscillator frequency for

IMP38C42/3 and IMP38HC42/3 devices. Output frequency

equals one-half the oscillator frequency for IMP38C44/5 and

IMP38HC44/5 devices.