Microsemi Corporation SG1524BF, SG1524BF-883B, SG1524BJ, SG1524BJ-883B, SG1524BJ-DESC Datasheet
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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.
•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
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VREF |
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+VIN |
Reference |
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Undervoltage |
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Regulator |
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Lockout |
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GROUND |
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OSC |
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To Internal |
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Circuitry |
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RT |
Oscillator |
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CT |
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COLLECTOR A |
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S |
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EMITTER A |
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T |
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R Q |
Q |
COLLECTOR B |
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S |
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INVERTING |
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P.W.M. |
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MEMORY |
TOGGLE |
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Error |
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D |
F/F |
F/F |
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NON-INVERTING |
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Q |
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+VIN |
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PWM |
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EMITTER B |
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+C.L. SENSE |
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LATCH |
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C.L. |
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-C.L. SENSE |
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COMPENSATION SHUTDOWN
2/00 Rev 1.3 2/00 |
LINFINITY Microelectronics Inc. |
Copyright 2000 |
11861 Western Avenue ∞ Garden Grove, CA 92841 |
1 |
(714) 898-8121 ∞ FAX: (714) 893-2570 |
SG1524B/SG2524B/SG3524B
ABSOLUTE MAXIMUM RATINGS (Note 1) |
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Input Voltage (+VIN) .......................................................... |
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42V |
Oscillator |
Charging Current .............................................. |
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5mA |
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Collector Voltage ............................................................. |
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60V |
Operating Junction Temperature |
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150°C |
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Logic Inputs .......................................................... |
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-0.3V to 5.5V |
Hermetic (J, L Packages) ............................................ |
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Current Limit Sense Inputs ..................................... |
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-0.3V to VIN |
Plastic (N, DW Packages) ........................................... |
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150°C |
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Output Current (each transistor) ................................. |
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200mA |
Storage Temperature Range ............................ |
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-65°C to 150°C |
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Reference Load Current ............................................... |
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50mA |
Lead Temperature (Soldering, 10 seconds) ................... |
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300°C |
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Note 1. Values beyond which damage may occur. |
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THERMAL DATA |
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J Package: |
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Thermal Resistance-Junction to Case, θJC .................. |
30°C/W |
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA). |
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Thermal Resistance-Junction to Ambient, θJA ............... |
80°C/W |
Note B. The above numbers for θJC are maximums for the limiting |
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N Package: |
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thermal resistance of the package in a standard mount- |
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Thermal Resistance-Junction to Case, θJC .................. |
40°C/W |
ing configuration. The |
θJA numbers are meant to be |
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Thermal Resistance-Junction to Ambient, θJA .............. |
65°C/W |
guidelines for the thermal performance of the device/pc- |
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DW Package: |
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board system. All of the above assume no ambient |
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Thermal Resistance-Junction to Case, θJC ................... |
40°C/W |
airflow. |
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Thermal Resistance-Junction to Ambient, θJA .............. |
95°C/W |
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L Package: |
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Thermal Resistance-Junction to Case, θJC ................... |
35°C/W |
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Thermal Resistance-Junction to Ambient, θJA ............ |
120°C/W |
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RECOMMENDED OPERATING CONDITIONS (Note 2) |
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Input Voltage (+VIN) ................................................ |
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7V to 40V |
Oscillator Frequency Range ........................ |
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100Hz to 400KHz |
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Collector Voltage .................................................... |
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0V to 60V |
Oscillator Timing Resistor (RT) |
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2KΩ to 150KΩ |
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Error Amp Common Mode Range ....................... |
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2.3V to VREF |
Oscillator Timing Capacitor (CT) .......................... |
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1nF to 0.1µF |
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Current Limit Sense Common Mode Range ...... |
0V to VIN-2.5V |
Operating Ambient Temperature Range |
-55°C to 125°C |
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Output Current (each transistor) .......................... |
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0 to 100mA |
SG1524B .................................................... |
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Reference Load Current ........................................ |
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0 to 20mA |
SG2524B ...................................................... |
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-25°C to 85°C |
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Oscillator Charging Current ............................ |
25µA to 1.8mA |
SG3524B ......................................................... |
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0°C to 70°C |
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Note 2: Range over which the device is functional. |
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ELECTRICAL CHARACTERISTICS |
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(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1524B with -55°C ≤ TA ≤ 125°C, SG2524B with - |
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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 |
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temperatures equal to the ambient temperature.) |
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Parameter |
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Test Conditions |
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SG1524B/2524B |
SG3524B |
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Units |
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Min. |
Typ. |
Max. |
Min. |
Typ. |
Max. |
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Reference Section (Note 3) |
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Output Voltage |
TJ = 25°C |
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4.95 |
5.00 |
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5.05 |
4.90 |
5.00 |
5.10 |
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V |
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Line Regulation |
VIN = 7V to 40V |
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3 |
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20 |
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3 |
30 |
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mV |
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Load Regulation |
IL = 0 to 20mA |
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5 |
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30 |
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5 |
50 |
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mV |
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Temperature Stability (Note 7) |
Over Operating Temperature Range |
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15 |
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50 |
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15 |
50 |
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mV |
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Total Output Voltage Range |
Over Line, Load and Temperature |
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4.90 |
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5.10 |
4.80 |
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5.20 |
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V |
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Short Circuit Current |
VREF = 0V |
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25 |
50 |
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120 |
25 |
50 |
120 |
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mA |
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Undervoltage Lockout Section |
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Threshold Voltage |
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4.3 |
4.5 |
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4.7 |
4.2 |
4.5 |
4.9 |
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V |
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Note 3. IL = 0mA |
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2/00 Rev 1.3 2/00 |
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LINFINITY Microelectronics Inc. |
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Copyright 2000 |
11861 Western Avenue ∞ Garden Grove, CA 92841 |
2 |
(714) 898-8121 ∞ FAX: (714) 893-2570 |
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