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Datasheet: GM38C4A-S8 (Gamma Microelectronics)

 

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GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Revision 1, May 2002 www.gammamicro.com
1
DIP-8, SOP-8 (TOP VIEW)
PIN CONNECTIONS
1
2
3
4
8
7
6
5
V
REF
V
DD
F B
I
SNS
R
T
/
C
T
COMP
GND
OUT
1
2
3
4
5
6
7
14
13
12
11
10
9
NC
I
SNS
OUT
PGND
COMP
FB
R
T
/C
T
GND
V
DD
8
V
REF
V
D
NC
NC
NC
DIP-14, SOP-14 (TOP VIEW)
The GM38C4x are fixed frequency, high performance, current-
mode PWM controllers. Gamma's BiCMOS devices are pin
compatible with standard 384x bipolar devices but with several
improvements.
Undervoltage lockout circuitry allows the '42 and '44 versions to
start up at 14.5V and operate down to 9V, and the '43 and '45
versions start at 8.4V with operation down to 7.6V. All versions
operate up to 20V. When compared to bipolar 384x devices
operating from a 15V supply, start-up current has been reduced
to 50
A typical and operating current has been reduced to 4.0
mA typical. Decreased output rise and fall times drive larger
MOSFETs, and rail-to-rail output capability increases efficiency,
especially at lower supply voltages. The GM38C4x also features
a trimmed oscillator discharge current and bandgap reference.
GM38C4x denotes 8-pin plastic DIP and SOP packages.
GM38C4x-1 denotes 14-pin plastic DIP and SOP packages. 8-
pin devices feature small size, while 14-pin devices separate
the analog and power connections for improved performance
and power dissipation.
40ns output rise and 30ns output fall times
40


C to +85


C temp. range same as standard UC284x
Low-power BiCMOS Process
Very low start-up current (50


A typical)
Low operating current (4mA typical)
CMOS outputs with rail-to-rail swing


500kHz current-mode operation
Pin-for-pin compatible with UC3842/3843/3844/3845(A)
Trimmed oscillator discharge current
UVLO with hysteresis
Low cross-conduction currents
Applications:
Current-mode, off-line, switched-mode power supplies
Current-mode, dc-to-dc converters.
Step-down "buck" regulators
Step-up "boost" regulators
Flyback, isolated regulators
Forward converters
Synchronous FET converters
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Revision 1, May 2002 www.gammamicro.com
2
PIN FUNCTIONS DESCRIPTION
N
I
P
d
a
e
l
-
8
N
I
P
d
a
e
l
-
4
1
N
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N
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:
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p
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2
3
B
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3
5
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5
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Revision 1, May 2002 www.gammamicro.com
3
R
E
T
E
M
A
R
A
P
L
O
B
M
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1
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1
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5
4
1
OPERATING RATINGS
.
o
N
T
R
A
P
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A
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C
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P
8
-
P
O
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4
1
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8
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8
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M
G
ORDERING INFORMATION
R
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T
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M
A
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C
ABSOLUTE MAXIMUM RATINGS
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Revision 1, May 2002 www.gammamicro.com
4
S
C
I
T
S
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V
7
.
2
=
L
k
5
1
=
V
o
t
F
E
R
1
.
0
1
.
1
V
h
t
d
i
w
d
n
a
B
n
i
a
G
y
ti
n
U
1
e
t
o
N
7
.
0
0
.
1
z
H
M
n
o
i
t
c
e
S
e
s
n
e
S
t
n
e
r
r
u
C
n
i
a
G
3
d
n
a
2
s
e
t
o
N
5
8
.
2
0
.
3
5
1
.
3
V
/
V
d
l
o
h
s
e
r
h
T
m
u
m
i
x
a
M
V
P
M
O
C
2
e
t
o
N
,
V
5
=
9
.
0
0
.
1
1
.
1
V
R
R
S
P
V
2
1




V
D
D




V
8
1
2
e
t
o
N
,
0
7
B
d
t
n
e
r
r
u
C
s
a
i
B
t
u
p
n
I
1
.
0
-
2
-
A
m
t
u
p
t
u
O
o
t
y
a
l
e
D
0
2
1
0
5
2
s
n
ELECTRICAL CHARACTERISTICS
(T
A
= -40C to 85C, Note 4, V
DD
=15V, C
T
=3.3nF, R
T
=11k
,
unless otherwise noted )
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Revision 1, May 2002 www.gammamicro.com
5
S
C
I
T
S
I
R
E
T
C
A
R
A
H
C
S
N
O
I
T
I
D
N
O
C
T
S
E
T
N
I
M
P
Y
T
X
A
M
T
I
N
U
n
o
i
t
c
e
S
t
u
p
t
u
O
R
)
N
O
(
S
D
h
g
i
H
R
)
N
O
(
S
D
w
o
L
I
E
C
R
U
O
S
A
m
0
0
2
=
0
2
I
K
N
I
S
A
m
0
0
2
=
1
1
e
m
i
T
e
s
i
R
T
A
C
,
C
5
2
=
L
F
n
1
=
0
4
0
8
s
n
e
m
i
T
ll
a
F
T
A
C
,
C
5
2
=
L
F
n
1
=
0
3
0
6
s
n
n
o
i
t
c
e
S
t
u
o
k
c
o
L
e
g
a
t
l
o
v
r
e
d
n
U
d
l
o
h
s
e
r
h
T
t
r
a
t
S
4
4
C
8
3
M
G
,
2
4
C
8
3
M
G
5
.
3
1
5
.
4
1
5
.
5
1
V
5
4
C
8
3
M
G
,
3
4
C
8
3
M
G
8
.
7
4
.
8
0
.
9
e
g
a
tl
o
V
g
n
it
a
r
e
p
O
m
u
m
i
n
i
M
4
4
C
8
3
M
G
,
2
4
C
8
3
M
G
8
9
0
1
V
5
4
C
8
3
M
G
,
3
4
C
8
3
M
G
0
.
7
6
.
7
2
.
8
n
o
i
t
c
e
S
M
W
P
e
l
c
y
C
y
t
u
D
m
u
m
i
x
a
M
3
4
C
8
3
M
G
,
2
4
C
8
3
M
G
4
9
6
9
%
5
4
C
8
3
M
G
,
4
4
C
8
3
M
G
6
4
0
5
e
l
c
y
C
y
t
u
D
m
u
m
i
n
i
M
0
%
t
n
e
r
r
u
C
y
b
d
n
a
t
S
l
a
t
o
T
t
n
e
r
r
u
C
p
U
-
t
r
a
t
S
V
D
D
4
4
C
8
3
M
G
,
2
4
C
8
3
M
G
r
o
f
V
3
1
=
V
D
D
5
4
C
8
3
M
G
,
3
4
C
8
3
M
G
r
o
f
V
5
.
7
=
0
5
0
0
2
A
t
n
e
r
r
u
C
y
l
p
p
u
S
g
n
it
a
r
e
p
O
V
B
F
V
=
S
N
S
I
V
0
=
4
6
A
m
e
g
a
tl
o
V
r
e
n
e
Z
I
D
D
6
e
t
o
N
,
A
m
5
2
=
0
3
7
3
V
ELECTRICAL CHARACTERISTICS
(T
A
= -40C to 85C, Note 4, V
DD
=15V, C
T
=3.3nF, R
T
=11k
,
unless otherwise noted )
Note 1: These parameters, although guaranteed, are not 100% tested in production.
Note 2: Parameter measured at trip point of latch with V
EA
= 0.
Note 3: Gain defined as:
V
PIN1
A = ; 0


V
TH
(I
SNS
)


0.8V
V
TH
(I
SNS
)
Note 4: Adjust V
DD
above the start threshold before setting at 15V.
Note 5: Output frequency equals oscillator frequency for the GM38C42 and GM38C43. Output frequency for the
GM38C44, and GM38C45 equals one half the oscillator frequency.
Note 6: On 8-pin version, 20V is maximum input on pin 7, as this is also the supply pin for the output stage.
On 14-pin version, 40V is maximum for pin 12 and 20V maximum for pin 11.
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