SG3844DM Microsemi Analog Mixed Signal Group, SG3844DM Datasheet - Page 4
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SG3844DM
Manufacturer Part Number
SG3844DM
Description
IC PWM CURRENT MODE 8SOIC
Manufacturer
Microsemi Analog Mixed Signal Group
Datasheet
1.SG3845M.pdf
(12 pages)
Specifications of SG3844DM
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
50%
Voltage - Supply
8.2 V ~ 30 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC
Frequency-max
500kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SG3844DM
Manufacturer:
Microsemi Analog Mixed Signal
Quantity:
1 791
4
SG1844/SG1845 Series
Notes: 4. These parameters, although guaranteed, are not 100% tested in
Current Sense Section
Gain (Notes 5 & 6)
Maximum Input Signal (Note 5)
Power Supply Rejection Ratio (Note 5) PSRR
Input Bias Current
Delay to Output (Note 4)
Output Section
Output Low Level
Output High Level
Rise Time (Note 4)
Fall Time (Note 4)
Under-Voltage Lockout Section
Start Threshold
Min. Operation Voltage After Turn-On
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
Power Consumption Section
Start-Up Current
Operating Supply Current
V
CC
Zener Voltage
5. Parameter measured at trip point of latch with V
production.
Parameter
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
E L E C T R I C A L C H A R A C T E R I S T I C S
Symbol
C
U R R E N T
P
R O D U C T I O N
V
12 ≤ V
I
I
I
I
T
T
1844
1845
1844
1845
V
I
SINK
SINK
SOURCE
SOURCE
CC
J
COMP
FB
J
= 25°C, C
= 25mA
= 25°C, C
= V
= 20mA
= 200mA
Test Conditions
= 5V
= 20mA
= 200mA
CC
ISENSE
- M
VFB
≤ 25V
= 0.
= 0V
L
L
O D E
= 1nF
= 1nF
P W M C
D
A T A
2.85
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
0.9
7.8
7.0
13
12
15
46
9
6. Gain defined as: A =
7. Adjust V
8. Output frequency equals one half of oscillator frequency.
O N T R O L L E R
SG1844/45
S
13.5
13.5
150
0.1
1.5
8.4
7.6
0.5
70
50
50
16
10
48
11
34
-2
3
1
H E E T
CC
3.15 2.85
300
150
150
-10
1.1
0.4
2.2
9.0
8.3
17
11
50
17
0
1
above the start threshold before setting at 15V.
(Cont'd.)
0.9
7.8
7.0
13
12
15
46
9
SG2844/45
13.5
13.5
150
0.1
1.5
8.4
7.6
0.5
70
50
50
16
10
48
11
34
∆ V
∆ V
-2
3
1
ISENSE
COMP
3.15 2.85
300
150
150
1.1
-10
0.4
2.2
9.0
8.2
17
11
50
17
0
1
; 0 ≤ V
14.5
0.9
7.8
8.5
7.0
13
12
46
SG3844/45
ISENSE
13.5
13.5
150
0.1
1.5
8.4
7.6
0.5
70
50
50
16
10
48
11
34
-2
3
1
≤ 0.8V.
3.15
17.5
11.5
300
150
150
1.1
-10
0.4
2.2
9.0
8.2
50
17
0
1
Copyright © 2000
Rev. 1.6c
Units
mA
mA
V/V
µA
dB
ns
ns
ns
%
%
V
V
V
V
V
V
V
V
V
V