MICROSEMI SG3524BN

SG1524B/SG2524B/SG3524B
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
FEATURES
The SG1524B is a pulse width modulator for switching power supplies
which features improved performance over industry standards like the
SG1524. A direct pin-for-pin replacement for the earlier device, it
combines advanced processing techniques and circuit design to provide
improved reference accuracy, and extended common mode range at the
error amplifier and current limit inputs. A DC-coupled flip-flop eliminates
triggering and glitch problems, and a PWM data latch prevents edge
oscillations. The circuit incorporates true digital shutdown for high speed
response, while an undervoltage lockout circuit prevents spurious outputs
when the supply voltage is too low for stable operation. Full double-pulse
suppression logic insures alternating output pulses when the Shutdown
pin is used for pulse-by-pulse current limiting. The SG1524B is specified
for operation over the full military ambient temperature range of -55°C to
125°C. The SG2524B is characterized for the industrial range of -25°C to
85°C, and the SG3524B is designed for the commercial range of 0°C
to 70°C.
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7V to 40V operation
5V reference trimmed to ±1%
100Hz to 400KHz oscillator range
Excellent external sync capability
Dual 100mA output transistors
Wide current limit common mode range
DC-coupled toggle flip-flop
PWM data latch
Undervoltage lockout
Full double-pulse suppression logic
60V output collectors
HIGH RELIABILITY FEATURES
- SG1524B
♦ Available to MIL-STD-883 and DESC SMD
♦ Scheduled for MIL-M-38510 QPL listing
♦ Radiation data available
♦ LMI level "S" processing available
DESCRIPTION
VREF
+VIN
Reference
Regulator
Undervoltage
Lockout
GROUND
To Internal
Circuitry
RT
OSC
Oscillator
COLLECTOR A
CT
S
Q
EMITTER A
T
R
S
P.W.M.
INVERTING
Q
D
Error
Q
MEMORY
F/F
Q
COLLECTOR B
TOGGLE
F/F
Q
NON-INVERTING
+VIN
PWM
LATCH
EMITTER B
+C.L. SENSE
C.L.
-C.L. SENSE
COMPENSATION
SHUTDOWN
Rev 1.3a 3.21.2005
Copyright  2000
Microsemi Inc.
1
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1524B/SG2524B/SG3524B
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Oscillator Charging Current ..............................................5mA
Operating Junction Temperature
Hermetic (J, L Packages) ............................................150°C
Plastic (N, DW Packages) ...........................................150°C
Storage Temperature Range ............................-65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ...................300°C
Input Voltage (+VIN) .......................................................... 42V
Collector Voltage ............................................................. 60V
Logic Inputs ..........................................................
-0.3V to 5.5V
Current Limit Sense Inputs .....................................-0.3V to VIN
Output Current (each transistor) ................................. 200mA
Reference Load Current ............................................... 50mA
RoHS Peak Package Solder Reflow Temp. (40 sec. max. exp.)...... 260°C(+0, -5)
Note 1. Values beyond which damage may occur.
THERMAL DATA
J Package:
Thermal Resistance-Junction to Case, θJC .................. 30°C/W
Thermal Resistance-Junction to Ambient, θJA ............... 80°C/W
N Package:
Thermal Resistance-Junction to Case, θJC .................. 40°C/W
Thermal Resistance-Junction to Ambient, θJA .............. 65°C/W
DW Package:
Thermal Resistance-Junction to Case, θJC ................... 40°C/W
Thermal Resistance-Junction to Ambient, θJA .............. 95°C/W
L Package:
Thermal Resistance-Junction to Case, θJC ................... 35°C/W
Thermal Resistance-Junction to Ambient, θJA ............ 120°C/W
RECOMMENDED OPERATING CONDITIONS
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θJC are maximums for the limiting
thermal resistance of the package in a standard mounting configuration. The θJA numbers are meant to be
guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient
airflow.
(Note 2)
Oscillator Frequency Range ........................ 100Hz to 400KHz
Oscillator Timing Resistor (RT) ......................... 2KΩ to 150KΩ
Oscillator Timing Capacitor (CT) .......................... 1nF to 0.1µF
Operating Ambient Temperature Range
SG1524B .................................................... -55°C to 125°C
SG2524B ...................................................... -25°C to 85°C
SG3524B ......................................................... 0°C to 70°C
Input Voltage (+VIN) ................................................ 7V to 40V
Collector Voltage .................................................... 0V to 60V
Error Amp Common Mode Range ....................... 2.3V to VREF
Current Limit Sense Common Mode Range ...... 0V to VIN-2.5V
Output Current (each transistor) .......................... 0 to 100mA
Reference Load Current ........................................ 0 to 20mA
Oscillator Charging Current ............................ 25µA to 1.8mA
Note 2: Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1524B with -55°C ≤ TA ≤ 125°C, SG2524B with 25°C ≤ TA ≤ 85°C, SG3524B with 0°C ≤ TA ≤ 70°C, and +VIN = 20V. Low duty cycle pulse testing techniques are used which maintains junction and case
temperatures equal to the ambient temperature.)
Parameter
Reference Section (Note 3)
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 7)
Total Output Voltage Range
Short Circuit Current
Test Conditions
TJ = 25°C
VIN = 7V to 40V
IL = 0 to 20mA
Over Operating Temperature Range
Over Line, Load and Temperature
VREF = 0V
Undervoltage Lockout Section
Threshold Voltage
SG1524B/2524B
SG3524B
Units
Min. Typ. Max. Min. Typ. Max.
4.95 5.00 5.05 4.90 5.00 5.10
3
20
3
30
5
30
5
50
15
50
15
50
4.90
5.10 4.80
5.20
25
50 120 25
50 120
4.3
4.5
4.7
4.2
4.5
4.9
V
mV
mV
mV
V
mA
V
Note 3. IL = 0mA
Rev 1.3a
Copyright  2000
2
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1524B/SG2524B/SG3524B
ELECTRICAL CHARACTERISTICS
Parameter
(continued)
Test Conditions
Oscillator Section (Note 4)
Initial Accuracy
TJ = 25°C
Voltage Stability
VIN = 7V to 40V
Temperature Stability (Note 7)
Over Operating Range
Minimum Frequency (Note 7)
RT = 150KΩ, CT = 0.1µF
Maximum Frequency
RT = 2KΩ, CT = 470pF
Sawtooth Peak Voltage
VIN = 40V
Sawtooth Valley Voltage
VIN = 7V
Clock Amplitude
Clock Pulse Width
Error Amplifier Section (Note 5)
Input Offset Voltage
RS ≤ 2KΩ
Input Bias Current
Input Offset Current
DC Open Loop Gain
RL ≥10MΩ
ISINK = 100µA; VPIN 1 - VPIN 2 ≥ 150mV
Output Low Level
Output High Level
ISOURCE = 100µA; VPIN 2 - VPIN 1 ≥ 150mV
VCM = 2.3V to VREF
Common Mode Rejection
VIN = 7V to 40V
Supply Voltage Rejection
Gain-Bandwidth Product (Note 7 )
TJ = 25°C
P.W.M. Comparator (Note 4)
Minimum Duty Cycle
VCOMP = 0.5V
Maximum Duty Cycle
VCOMP = 3.9V
Current Limit Amplifier Section (Note 6)
Sense Voltage
Input Bias Current
Shutdown Input Section
HIGH Input Voltage
HIGH Input Current
VSHUTDOWN = 5.0V
LOW Input Voltage
Output Section (each transistor)
Collector Leakage Current
VCE = 60V
Collector Saturation Voltage
IC = 10mA
IC = 100mA
Emitter Output Voltage
IE = 10mA
IE = 100mA
Emitter Voltage Rise Time (Note 7) RE = 2KΩ, TA = 25°C
Collector Voltage Fall Time
RC = 2KΩ, TA = 25°C
Power Consumption
Standby Current
Note 4.
Note 5.
Note 6.
Note 7.
VIN = 40V, VSHUTDOWN = 2.0V
SG1524B/2524B
SG3524B
Units
Min. Typ. Max. Min. Typ. Max.
42
400
0.6
3.0
0.2
60
45
0.1
1
50
600
3.5
1
4.0
0.5
48
1
2
140
0.5
1
5
5
1
40
400
3.9
1.2
0.6
3.0
0.2
60
3.8
70
76
1
78
0.2
4.2
90
100
2
45
49
180
200
-3
220
-10
0.1
1
0.6
45
0.1
1
50
600
3.5
1
4.0
0.5
50
1
2
120
2
1
10
10
1
3.8
70
76
1
78
0.2
4.2
90
100
2
45
49
170
0.5
0
2.0
17.5
17
3.9
1.2
0.5
5
50
0.4
2.0
%
%
200
-3
230
-10
mV
µA
0.1
1
0.6
V
mA
V
0.5
0.2
0.2
1.0
19
18
0.2
0.1
12
5
17.5
17
mV
µA
µA
dB
V
V
dB
dB
MHz
0
2.0
0.2
1.0
19
18
0.2
0.1
KHz
%
%
Hz
KHz
V
V
V
µs
0.5
0.2
µA
V
V
V
V
µs
µs
12
mA
50
0.4
2.0
FOSC = 45KHz (RT = 2700Ω, CT = .01µF)
VCM = 2.3V to VREF
VCM = 0V to 17.5V
These parameters, although guaranteed over the recommended operating conditions, are not tested in production.
Rev 1.3a
Copyright  2000
3
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1524B/SG2524B/SG3524B
TYPICAL CHARACTERISTIC CURVES
1000000
100000
Oscillator Freq (Hz)
1nF
3nF
10000
10nF
0.1uF
1000
1uF
100
1000
10000
RT (Ohm)
100000
1000000
Figure 1
Oscillator Frequency vs. Timing Resistor and Capacitor
VIN=20V, TA=25°C
5
Dead Time (uS)
4
3
2
1
0
0
10
20
30
40
50
60
70
80
90
100
C T (nF)
Figure 2
SG1524B Dead Time vs. Timing capacitance (RT=2.7k)
VIN=20V, TA=25°C
Open Loop Voltage Gain (dB)
60
RF=1M
50
RF=300K
40
RF=100K
30
20
10
0
100
1000
10000
100000
1000000
FREQUENCY (Hz)
Figure 3
SG1524B Error Amp Voltage Gain vs. Freq over RF
VIN=20V, TA=25°C
Rev 1.3a
Copyright  2000
4
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1524B/SG2524B/SG3524B
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
16-PIN CERAMIC DIP
J - PACKAGE
Part No.
(See Notes Below)
Ambient
Temperature Range
SG1524BJ/883B
SG1524BJ/DESC
SG1524BJ
SG2524BJ
SG3524BJ
-55°C
-55°C
-55°C
-25°C
0°C
to
to
to
to
to
125°C
125°C
125°C
85°C
70°C
16-PIN PLASTIC DIP
N - PACKAGE
SG2524BN
SG3524BN
-25°C to 85°C
0°C to 70°C
16-PIN WIDE BODY
PLASTIC S.O.I.C.
DW - PACKAGE
SG2524BDW
SG3524BDW
-25°C to 85°C
0°C to 70°C
Connection Diagram
INV. INPUT
N.I. INPUT
OSC. OUTPUT
+C.L. SENSE
-C.L. SENSE
RT
CT
1
16
2
15
3
14
4
13
5
12
6
11
VREF
+VIN
EB
CB
CA
EA
10
SHUTDOWN
COMPENSATION
GROUND
9
8
N Package: RoHS Compliant / Pb-free Transition DC: 0503
N Package: RoHS / Pb-free 100% Matte Tin Lead Finish
7
INV. INPUT
N.I. INPUT
OSC. OUTPUT
+C.L. SENSE
-C.L. SENSE
RT
CT
GROUND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
V REF
+V IN
EB
CB
CA
EA
SHUTDOWN
COMPENSATION
DW Package: RoHS Compliant / Pb-free Transition DC: 0516
DW Package: RoHS / Pb-free 100% Matte Tin Lead Finish
20-PIN CERAMIC
LEADLESS CHIP CARRIER
L- PACKAGE
SG1524BL/883B
SG1524BL
-55°C to 125°C
-55°C to 125°C
1. N.C.
2. INV. INPUT
3. N.I. INPUT
4. OSC. OUTPUT
5. +C.L. SENSE
6. N.C.
7. -C.L. SENSE
8. RT
9. CT
10. GROUND
3
2
1
20 19
4
18
5
17
6
16
7
15
8
14
9
10 11 12 13
11. N.C.
12. COMP
13. SHUTDOWN
14. EA
15. CA
16. N.C.
17. CB
18. EB
19. +VIN
20. VREF
Note 1. Contact factory for JAN and DESC product availablity.
2. All packages are viewed from the top.
Rev 1.3a
Copyright  2000
5
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570