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PDF SG3525A Data sheet ( Hoja de datos )
| Número de pieza | SG3525A | |
| Descripción | REGULATING PULSE WIDTH MODULATOR | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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SG1525A/SG2525A/SG3525A
SG1527A/SG2527A/SG3527A
Regulating Pulse Width Modulator
Description
The SG1525A/1527A series of pulse width modulator integrated
circuits are designed to offer improved performance and lower
external parts count when used to implement all types of switching
power supplies. The on-chip +5.1 V reference is trimmed to ±1%
initial accuracy and the input common-mode range of the error
amplifier includes the reference voltage, eliminating external
potentiometers and divider resistors. A Sync input to the oscillator
allows multiple units to be slaved together, or a single unit to be
synchronized to an external system clock. A single resistor between
the CT pin and the Discharge pin provides a wide range of deadtime
adjustment. These devices also feature built-in soft-start circuitry
with only a timing capacitor required externally. A Shutdown pin
controls both the soft-start circuitry and the output stages, providing
instantaneous turn-off with soft-start recycle for slow turn-on. These
functions are also controlled by an undervoltage lockout which
keeps the outputs off and the soft-start capacitor discharged for
input voltages less than that required for normal operation. Another
unique feature of these PWM circuits is a latch following the
comparator. Once a PWM pulse has been terminated for any
reason, the outputs remain off for the duration of the period. The
latch is reset with each clock pulse. The output stages are totem-
pole designs capable of sourcing or sinking in excess of 200mA.
The SG1525A output stage features NOR logic, giving a LOW
output for an OFF state. The SG1527A utilizes OR logic, which
results in a HIGH output level when OFF.
Block Diagram
Features
8V to 35V Operation
5.1V Reference Trimmed to 1%
100Hz to 500kHz Oscillator Range
Separate Oscillator Sync Terminal
Adjustable Deadtime Control
Internal Soft-start
Input Undervoltage Lockout
Latching P.W.M. to Prevent Multiple Pulses
Dual Source/Sink Output Drivers
High Reliability Features
Following are the high reliability features of SG1525A
and SG1527A:
Available to MIL-STD-883, ¶ 1.2.1
MIL-M38510/12602BEA - JAN1525AJ
MIL-M38510/12604BEA - JAN1527AJ
MSC-AMS level “S” Processing Available
+VIN
GROUND
SYNC
RT
CT
DISCHARGE
COMPENSATION
INV. INPUT
N.I. INPUT
SOFT-SART
SHUTDOWN
VREF
REFERENCE
REGULATOR
U.V.
LOCKOUT
TO
INTERNAL CIRCUITRY
OSC OUTPUT
OSCILLATOR
Q
Q
F/F
P.W.M.
R
+S
LATCH
VIN
+
ERROR
AMP
5k
50µA
VREF
5k
VC
OUTPUT A
OUTPUT B
SG1525A OUTPUT STAGE
VC
OUTPUT A
OUTPUT B
SG1527A OUTPUT STAGE
Figure 1 · Block Diagram
September 2014 Rev. 1.4a
www.microsemi.com
© 2014 Microsemi Corporation
1
1 page  
Electrical Characteristics (continued)
Electrical Characteristics (continued)
Parameter
Test Conditions
Oscillator Section2
Initial Accuracy
TJ = 25C
Voltage Stability
Temperature Stability1
Minimum Frequency1
Maximum Frequency1
VIN = 8V to 35V
MIN ≤ TJ ≤ MAX
RT = 150kΩ, CT = 0.1μF
RT = 2 kΩ, CT = 1nF
Current Mirror
IRT = 2mA
Clock Amplitude
Clock Width
TJ = 25C
Sync Threshold
Sync Input Current
Sync Voltage = 3.5V
Error Amplifier Section (VCM = 5.1V)
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
Output Low Level
RL ≥ 10MΩ, TJ = 25C
Output High Level
Common Mode Rejection VCM = 1.5V to 5.2 V
Supply Voltage Rejection VIN = 8V to 35V
PWM Comparator Section2
Minimum Duty Cycle
Maximum Duty Cycle
Input Threshold2
VCOMP = 0.6V
VCOMP = 3.6V
Zero Duty Cycle
Maximum Duty Cycle
Input Bias Current
Soft-Start Section
Soft Start Current
VSHUTDOWN = 0V
Soft Start Voltage
VSHUTDOWN = 2V
Shutdown Input Current
VSHUTDOWN = 2.5V
SG1525A/2525A
SG1527A/2527A
Min Typ Max
37.6 40 42.4
±0.3 ±1
±3 ±6
150
350
1.7 2.0 2.2
3.0 3.5
0.3 0.5 1.0
1.2 2.0 2.8
1.0 2.5
0.5 5
1 10
1
60 75
0.2 0.5
3.8 5.6
60 75
50 60
0
45 49
0.6 0.9
3.3 3.6
0.05 2.0
25 50 80
0.4 0.6
0.4 1.0
SG3525A/SG3527A
Min Typ Max
37.6 40 42.4
±1 ±2
±3 ±6
150
350
1.7 2.0 2.2
3.0 3.5
0.3 0.5 1.0
1.2 2.0 2.8
1.0 2.5
2 10
1 10
1
60 75
0.2 0.5
3.8 5.6
60 75
50 60
0
45 49
0.6 0.9
3.3 3.6
0.05 2.0
25 50 80
0.4 0.6
0.4 1.0
Units
kHz
%
%
Hz
kHz
mA
V
µs
V
mA
mV
µA
µA
dB
V
V
dB
dB
%
%
V
V
µA
µA
V
mA
5
5 Page 
Package Outline Dimensions
Package Outline Dimensions
Controlling dimensions are in metric, inches equivalents are shown for general information.
16
H
1
e
D
A
SEATING PLANE
9
E
8
BL
A2 c
A1
MILLIMETERS
Dim
MIN MAX
INCHES
MIN MAX
A
2.06 2.65 0.081
0.104
A1 0.10 0.30 0.004 0.012
A2 2.03 2.55 0.080 0.100
B
0.33 0.51 0.013
0.020
c
0.23 0.32 0.009
0.013
D 10.08 10.50 0.397 0.413
E
7.40 7.60 0.291
0.299
e 1.27 BSC
0.05 BSC
H 10.00 10.65 0.394 0.419
L
0.40 1.27 0.016
0.050
θ
0° 8°
0°
8°
*LC - 0.10 -
0.004
*Lead co planarity
Note:
Dimensions do not include protrusions; these shall
not exceed 0.155mm (.006”) on any side. Lead
dimension shall not include solder coverage.
Dimensions are in mm, inches are for reference only.
Figure 10 · DW 16-Pin SOWB Package Dimensions
D
1
A2
b1
e SEATING PLANE
b
E1
A
A1
L
E
θ
MILLIMETERS
Dim
MIN MAX
INCHES
MIN MAX
A
- 5.33
-
0.210
A1 0.38 - 0.015
-
A2 3.30 Typ.
0.130 Typ.
b
0.36 0.56 0.014
0.022
b1
1.14 1.78 0.045
0.070
c
0.20 0.36 0.008
0.014
D 18.67 19.69 0.735 0.775
e 2.54 BSC
0.100 BSC
c
E
7.62 8.26 0.300
0.325
E1 6.10 7.11 0.240 0.280
L
2.92 0.381 0.115
0.150
θ
- 15°
-
15°
Note:
DFimigeunrseio1n1s ·do not include protrusions; these shall
not exceed 0.155mm (.006”) on any side. Lead
dimension shall not include solder coverage.
Dimensions are in mm, inches are for reference only.
Figure 11 · N 16-Pin Plastic Dual Inline Package Dimensions
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SG3525A.PDF ] | |
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