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SG3844DM Datasheet(PDF) 11 Page - Microsemi Corporation

Part # SG3844DM
Description  CURRENT MODE PWM CONTROLLER
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

SG3844DM Datasheet(HTML) 11 Page - Microsemi Corporation

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C URRENT -M ODE PWM C ONTROLLER
SG1844/SG1845 Series
PRODUCT DA T ABOOK 1996/1997
11
Copyright © 2000
Rev. 1.4
4/00
P RODUCTION D ATA S HEET
TYPICAL APPLICA TION CIRCUITS
FIGURE 17. — ISOLATED MOSFET DRIVE
FIGURE 16. — BIPOLAR TRANSISTOR DRIVE
Current transformers can be used where isolation is required
between PWM and Primary ground. A drive transformer is then
necessary to interface the PWM output with the MOSFET.
The 1844/45 output stage can provide negative base current to
remove base charge of power transistor (Q
1) for faster turn off.
This
is accomplished by adding a capacitor (C
1) in parallel with a resistor
(R
1).
The resistor (R
1) is to limit the base current during turn on.
Pin numbers referenced are for 8-pin package and pin numbers in parenthesis are for 14-pin package.
FIGURE 14. — CURRENT SENSE SPIKE SUPPRESSION
FIGURE 15. — MOSFET PARASITIC OSCILLATIONS
A resistor (R
1) in series with the MOSFET gate reduce overshoot and
ringing caused by the MOSFET input capacitance and any inductance
in series with the gate drive. (Note: It is very important to have a
low inductance ground path to insure correct operation of the I.C.
This can be done by making the ground paths as short and as wide
as possible.)
The RC low-pass filter will eliminate the leading edge current spike
caused by parasitics of Power MOSFET.
V
CC
V
IN
7 (12)
7 (11)
6 (10)
5 (8)
3 (5)
R
C
R
S
Q1
I
PK
I
PK(MAX) =
1.0V
R
S
SG1844/45
V
CC
V
IN
7 (12)
7 (11)
6 (10)
5 (8)
R
S
Q1
SG1844/45
3 (5)
R
1
SG1844/45
3 (5)
5 (8)
6 (10)
7 (11)
R
S
Q1
V
C1
C
1
R
1
R
2
V
IN
V
C
I
B
+
V
C
R
2
»
V
C1
R
1||R2
»
_
V
CC
V
IN
7 (12)
7 (11)
6 (10)
5 (8)
3 (5)
SG1844/45
Isolation
Boundary
C
R
R
S
N
S
N
P
Q1
V
GS Waveforms
+
_0
+
_0
50% DC
25% DC
I
PK =
V (PIN 1) - 1.4
3R
S
N
P
N
S


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