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SG1844 Datasheet(PDF) 3 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) 3 Page - Microsemi Corporation

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C URRENT -M ODE PWM C ONTROLLER
SG1844/SG1845 Series
PRODUCT DA T ABOOK 1996/1997
3
Copyright © 2000
Rev. 1.4
4/00
P RODUCTION D ATA S HEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1844/SG1845 with -55°C
≤ T
A ≤ 125°C, SG2844/
SG2845 with -25°C
≤ T
A ≤ 85°C, SG3844/SG3845 with 0°C ≤ TA ≤ 70°C, VCC = 15V (Note 7), RT = 10kΩ, and CT = 3.3nF.
Low duty cycle pulse testing
techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Reference Section
Parameter
Symbol
Test Conditions
Output Voltage
T
J = 25°C, IO = 1mA
Line Regulation
12
≤ V
IN ≤ 25V
Load Regulation
1
≤ I
O ≤ 20mA
Temperature Stability (Note 4)
Total Output Variation (Note 4)
Line, Load, Temp.
Output Noise Voltage (Note 4)
V
N
10Hz
≤ f ≤ 10kHz, T
J = 25°C
Long Term Stability (Note 4)
T
A = 125°C, 1000hrs
Output Short Circuit
SG3844/45
Units
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
SG2844/45
4.95 5.00 5.05 4.95 5.00 5.05 4.90 5.00 5.10
V
620
6
20
620
mV
625
6
25
625
mV
0.2
0.4
0.2
0.4
0.2
0.4
mV/°C
4.90
5.10 4.90
5.10 4.82
5.18
V
50
50
50
µV
525
5
25
525
mV
-30
-100 -180
-30
-100 -180
-30
-100 -180
mA
Oscillator Section
Initial Accuracy (Note 8)
T
J = 25°C
Voltage Stability
12V
≤ V
CC
≤ 25V
Temperature Stability (Note 4)
T
MIN
≤ T
A
≤ T
MAX
Amplitude
V
RT/CT (Peak to Peak)
Discharge Current
T
J = 25°C
T
MIN ≤ TA ≤ TMAX
Error Amp Section
Input Voltage
V
COMP = 2.5V
Input Bias Current
Open Loop Gain
A
VOL
2
≤ V
O ≤ 4V
Unity Gain Bandwidth (Note 4)
T
J = 25°C
Power Supply Rejection Ratio
PSRR
12
≤ V
CC
≤ 25V
Output Sink Current
V
VFB = 2.7V, VCOMP = 1.1V
Output Source Current
V
VFB = 2.3V, VCOMP = 5V
V
OUT High
V
VFB = 2.3V, RL = 15K to gnd
V
OUT Low
V
VFB = 2.7V, RL = 15K to VREF
SG1844/45
47
52
57
47
52
57
47
52
57
kHz
.021
0.21
0.21
%
55
5
%
1.7
1.7
1.7
V
7.8
8.3
9.1
7.5
8.4
9.3
7.5
8.4
9.3
mA
6.8
9.3
7.2
9.5
7.2
9.5
mA
2.45 2.50 2.55 2.45 2.50 2.55 2.42 2.50 2.58
V
-0.3
-1
-0.3
1
-0.3
-2
µA
65
90
65
90
65
90
dB
0.7
1
0.7
1
0.7
1
MHz
60
70
60
70
60
70
dB
26
2
6
26
mA
-0.5
-0.8
-0.5
-0.8
-0.5
-0.8
mA
56
5
6
56
V
0.7
1.1
0.7
1.1
0.7
1.1
V
Supply Voltage Range
Output Current (Peak)
Output Current (Continuous)
Analog Inputs (Pin 2, Pin 3)
Error Amp Output Sink Current
Oscillator Frequency Range
Oscillator Timing Resistor
R
T
Oscillator Timing Capacitor
C
T
Operating Ambient Temperature Range:
SG1844/45
SG2844/45
SG3844/45
RECOMMENDED OPERA TING CONDITIONS
(Note 3)
Parameter
Symbol
Units
Recommended Operating Conditions
Min.
Typ.
Max.
30
V
±1
A
200
mA
02.6
V
5mA
0.1
500
kHz
0.52
150
k
0.1
1.0
µF
-55
125
°C
-25
85
°C
070
°C
Note 3. Range over which the device is functional.
(Electrical Characteristics continue next page.)


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