SG1844 查看數據表（PDF） - Microsemi Corporation
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SG1844 Datasheet PDF : 12 Pages
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PRODUCT DATABOOK 1996/1997
SG1844/SG1845 Series
CURRENT-MODE PWM CONTROLLER
PRODUCTION DATA SHEET
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 (Cont'd.)
Parameter
Symbol Test Conditions
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
VCC Zener Voltage
VCOMP = 5V
12 ≤ VCC ≤ 25V
ISINK = 20mA
ISINK = 200mA
ISOURCE = 20mA
ISOURCE = 200mA
T J = 25°C, CL = 1nF
TJ = 25°C, CL = 1nF
1844
1845
1844
1845
VFB = VISENSE = 0V
ICC = 25mA
Notes: 4. These parameters, although guaranteed, are not 100% tested in
production.
5. Parameter measured at trip point of latch with VVFB = 0.
SG1844/45
SG2844/45
SG3844/45 Units
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
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
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
46 48 50 46 48 50 46 48 50 %
0
0
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 =
∆ VCOMP
∆ VISENSE
;
0 ≤ VISENSE ≤ 0.8V.
7. Adjust VCC above the start threshold before setting at 15V.
8. Output frequency equals one half of oscillator frequency.
4
Copyright © 2000
Rev. 1.4 4/00
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