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SG1844 Datasheet(PDF) 4 Page - Microsemi Corporation

Part No. SG1844
Description  CURRENT MODE PWM CONTROLLER
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Maker  MICROSEMI [Microsemi Corporation]
Homepage  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

SG1844 Datasheet(HTML) 4 Page - Microsemi Corporation

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C URRENT -M ODE PWM C ONTROLLER
SG1844/SG1845 Series
PRODUCT DA T ABOOK 1996/1997
Copyright © 2000
Rev. 1.4
4/00
4
P RODUCTION D ATA S HEET
ELECTRICAL CHARACTERISTICS
(Cont'd.)
Under-Voltage Lockout Section
Parameter
Symbol
Test Conditions
Start Threshold
1844
1845
Min. Operation Voltage After Turn-On
1844
1845
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
Power Consumption Section
Start-Up Current
Operating Supply Current
V
FB = VISENSE = 0V
V
CC Zener Voltage
I
CC = 25mA
Notes: 4. These parameters, although guaranteed, are not 100% tested in
production.
5. Parameter measured at trip point of latch with V
VFB = 0.
SG3844/45
Units
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
SG2844/45
15
16
17
15
16
17
14.5
16
17.5
V
7.8
8.4
9.0
7.8
8.4
9.0
7.8
8.4
9.0
V
9
10
11
9
10
11
8.5
10
11.5
V
7.0
7.6
8.3
7.0
7.6
8.2
7.0
7.6
8.2
V
SG1844/45
46
48
50
46
48
50
46
48
50
%
00
0
%
0.5
1
0.5
1
0.5
1
mA
11
17
11
17
11
17
mA
34
34
34
V
6. Gain defined as: A =
; 0
≤ V
ISENSE ≤ 0.8V.
7. Adjust V
CC above the start threshold before setting at 15V.
8. Output frequency equals one half of oscillator frequency.
Output Low Level
I
SINK = 20mA
I
SINK = 200mA
Output High Level
I
SOURCE = 20mA
I
SOURCE = 200mA
Rise Time (Note 4)
T
J = 25°C, CL = 1nF
Fall Time (Note 4)
T
J = 25°C, CL = 1nF
Current Sense Section
Gain (Notes 5 & 6)
Maximum Input Signal (Note 5)
V
COMP = 5V
Power Supply Rejection Ratio (Note 5)
PSRR
12
≤ V
CC ≤ 25V
Input Bias Current
Delay to Output (Note 4)
Output Section
2.85
3
3.15 2.85
3
3.15 2.85
3
3.15
V/V
0.9
1
1.1
0.9
1
1.1
0.9
1
1.1
V
70
70
70
dB
-2
-10
-2
-10
-2
-10
µA
150
300
150
300
150
300
ns
0.1
0.4
0.1
0.4
0.1
0.4
V
1.5
2.2
1.5
2.2
1.5
2.2
V
13
13.5
13
13.5
13
13.5
V
12
13.5
12
13.5
12
13.5
V
50
150
50
150
50
150
ns
50
150
50
150
50
150
ns
∆ V
COMP
∆ V
ISENSE


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