IMP38HC45 IMP, IMP38HC45 Datasheet - Page 2

• Manufacturer Part Number: IMP38HC45
• Description: (IMP38HC42 - IMP38HC45) BiCMOS Current-Mode PWM Controllers
• Manufacturer: IMP

www.DataSheet.co.kr
powered through the out pin. Leakage current from the external
power MOSFETs will not force the PWM output to rise and turn
the external MOSFETs on.
Current-sense propagation delay time is 35ns typical, 65ns maxi-
mum, representing an up to 75 percent reduction over other 38xx
implementations.
Output stage drive is 0.5A for IMP38C4x devices. The high-drive
IMP38HC4x family is rated at 1.0A peak current drive.
Like conventional 384x controllers, the IMP38C4x and
IMP38HC4x controllers use the current-mode architecture for
superior load regulation, pulse-by-pulse current limiting and out-
put MOSFET protection. All versions operate up to 20 volts.
2
Pin Configuration
Pin Descriptions
I M P 3 8 C / H C / 4 2 / 3 / 4 / 5
I M P 3 8 C / H C / 4 2 / 3 / 4 / 5
1
2
3
4
5
6
7
8
COMP
RT/CT
ISNS
FB
, 2
1
2
3
4
, 4
IMP38HC4x
IMP38C4x
1
1
1
1
1
3
5
7
8
9
0
2
4
1
, 6
1
3
8
7
6
5
G
V
V
OUT
GND
38C/HC_02.eps
REF
DD
N
C
R
A
D
S I
O
V
O
V
G
T
N
F
V
P /
R
N
U
D
C /
M
B
N
C
E
D
D
G
T
S
F
D
P
T
N
D
408-432-9100/www.impweb.com
O
n I
C
O
V
C
C
g
H
V
S
5
A
O
N
o r
- V
r u
R
T
o
g i
C
u
n
o
u
c s
u
v
E
C
m
p
a
p t
e
p t
u
h
e r
e r
F
d
n i
l l i
p
o l
t r
s i
n
p -
b
t u
t e
t u
y l
a
e t
t a
e f
n i
t n
d
g
n i
n
o
r e
b
n r
f o
g
r o
e r
r d
v
e
f
g
d
w
e
s
r o
l o
m
d
o r
a
n i
e
o l
e
n
v i
c
h t
R
a t
c l
n
c
n i
, r
a
p
u
p
1
w
r e
C
e
s
e
p
o
n
t u
4
g
For maximum application flexibility, start-up voltage ranges from
14.5V to 8.4V. Start-up current has been reduced to 120µA maxi-
mum and operating current has been reduced to 1.5mA maximum.
The IMP38C4x/IMP38HC4x are available in 8-pin and 14-pin DIP
and SO packages as well as the 8-pin MicroSO package. The 14-
pin devices provide separate pins for the controller power supply
and the output driver supply. This configuration maximizes
application flexibility and performance. The 14-pin package can
also dissipate more power. Devices in the compact 8-pin packages
do not have separate output drive supply connections.
The IMP38C4x and IMP38HC4x families operate over the –40°C
to +85°C temperature range.
e
o t
o
e
h t
a
w
d
p -
e
E
v
s
i t
n
h t
t i c
e t
f o
c
l o
u
m
r e
e
r r
c
n
n i
n i
o
p
e
m
a t
o
e
r o
r o
n i
U
m
p
h t
p
a
n
t c
p
m
p -
u
g
y l
g
V
n
n
p
e
a
a
C
o i
. t
e
a
d
L
e
r a
k c
o
m
c
v
T
E
i x
. n
O
t c
o
o
e l
l o
a
t a
p
r r
a
m
u
m
s i
o i
n
i f i l
a t
g
h t
r d
p t
r o
r o
a
u
p
n
. e
c
e r
g
o l
r e
m
u
o
v i
o
A
n i
f
e
. t
n
g
r o
r e
s
n
m
d
a
p
e
h
f
n
r o
g
n
u
u
t n
l o
p
1
e
o
o r
COMP
d
y t
RT/CT
. t
f i l
4
c
u
. d
ISNS
1
c
p -
e t
u
p t
n i
e i
t I
y c
4
o
NC
NC
NC
FB
n
d
n i
p -
p
. r
n
u
s i
d
l c
. t
t u
n
o t
n i
p
f
1
2
3
4
5
6
7
n i
e
. e
r o
O
a
o t
t c
e t
g
p
k c
U
o i
o r
a
8
IMP38HC4x
n r
h t
IMP38C4x
T
k c
p -
a
. n
u
a
e
g
p
n
n i
a
y l l
. e
R
n i
P
. d
g
e
p
. e
W
i l
s i
s
D
a
m
M
t s i
k c
f i
a
i
e f
e t
c
r o
a
c
14
13
12
10
11
v i t
9
8
e r
o
d
g
m
e
R
e
o t
t n
38C/HC_03.eps
V
NC
V
V
OUT
AGND
PGND
d
T
y l
p
REF
DD
D
a
v
d
1
s i
h
a
a r
. V
e
e
u l
v
c
o t
d l
c i
o
e
. r
n
s
e
L
n
s
f o
O
e
© 2000 IMP, Inc.
a
W
c
n
R
e t
d
T
w
d
p
h
3
a
o t
8
o
e
C
n
-
w
H
n
d
C
r e
_
0 t
1
e .
p
s
Datasheet pdf - http://www.DataSheet4U.net/
!