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Part: SG3525AN
Category:
Power Management
-> Voltage Mode PWMs
Description: Voltage Mode Pwms, Package : Dip
Company: Microsemi Corporation
Datasheet: Download SG3525AN datasheet File size : 611 kB
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Datasheet text preview:
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 volt 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 will 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.
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 - SG1525A, SG1527A Available to MIL-STD-883B MIL-M38510/12602BEA - JAN1525AJ MIL-M38510/12604BEA - JAN1527AJ Radiation data available LMI level "S" processing available
BLOCK DIAGRAM
11/91 Rev 1.4 10/02
Copyright © 1996
1
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1525A/SG1527A SERIES
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (+VIN) ....... 40V Collector Supply Voltage (VC) .......... 40V Logic Inputs ....... -0.3V to 5.5V Analog Inputs ....... -0.3V to V IN Output Current, Source or Sink .. 500mA Reference Load Current ..... 50mA
Note 1. Values beyond which damage may occur.
Oscillator Charging Current ........... Operating Junction Temperature Range Hermetic (J, L Packages) .... Plastic (N, DW Packages ) ...... Storage Temperature Range .. -65°C to Lead Temperature (Soldering, 10 seconds) ........
5mA 150°C 150°C 150°C 300°C
THERMAL DATA
J Package: Thermal Resistance-Junction to Case, JC ......... 30°C/W Thermal Resistance-Junction to Ambient, JA ..... 80°C/W DW Package: Thermal Resistance-Junction to Case, JC ......... 40°C/W Thermal Resistance-Junction to Ambient, JA .... 95°C/W L Package: Thermal Resistance-Junction to Case, JC ......... 35°C/W Thermal Resistance-Junction to Ambient, JA .. 120°C/W N Package: Thermal Resistance-Junction to Case, JC .......... 40°C/W Thermal Resistance-Junction to Ambient, JA .... 65°C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x JA). Note B. The above numbers for JC are maximums for the limiting
thermal resistance of the package in a standard mounting configuration. The JA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS (Note 2)
Input Voltage (+VIN) ...... 8V to 35V Collector Voltage (VC) ......... 4.5V to 35V Sink/Source Load Current (steady state) .... 0 to 100mA Sink/Source Load Current (peak) ....... 0 to 400mA Reference Load Current ....... 0 to 20mA Oscillator Frequency Range ..... 100Hz to 350KHz Oscillator Timing Resistor (RT) ...... 2K to 150K
Note 2: Range over which the device is functional.
Deadtime Resistor Range (RD) ..... 0 to 500 Maximum Shutdown Source Impedance ....... 5K Oscillator Timing Capacitor (CT) .......... 0.001µF to 0.1µF Operating Ambient Temperature Range SG1525A/SG1527A ... -55°C to 125°C SG2525A/SG2527A ..... -25°C to 85°C SG3525A/SG3527A ........ 0°C to 70°C
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1525A/SG1527A with -55°C TA 125°C, SG2525A/SG2527A with -25°C TA 85°C, SG3525A/SG3527A 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.)
ELECTRICAL CHARACTERISTICS
Parameter Reference Section Output Voltage Line Regulation Load Regulation Temperature Stability (Note 3) Total Output Voltage Range (Note 3) Short Circuit Current Output Noise Voltage (Note 3) Long Term Stability (Note 3)
Test Conditions
SG1525A/2525A SG3525A Units SG1527A/2527A SG3527A Min. Typ. Max. Min. Typ. Max. 5.05 5.10 10 20 20 5.00 80 40 20 5.15 5.00 5.10 30 10 50 20 50 20 5.20 4.95 100 80 200 40 50 20 5.20 V 30 mV 50 mV 50 mV 5.25 V 100 mA 200 µ Vrms 50 mV/khr
TJ = 25°C VIN = 8V to 35V IL = 0 to 20mA Over Operating Temperature Range Over Line, Load and Temperature VREF = 0V, TJ = 25°C 10Hz f 10KHz, TJ = 25°C TJ = 125°C
Note 3. These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production. Note 4. FOSC = 40KHz (RT = 3.6K, CT = 0.01µF, RD = 0) Note 5. Applies to SG1525A/2525A/3525A only, due to polarity of output pulses.
11/91 Rev 1.4 10/02
Copyright © 1996
2
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1525A/SG1527A SERIES
ELECTRICAL CHARACTERISTICS (continued)
Parameter Test Conditions SG1525A/2525A SG3525A SG1527A/2527A SG3527A Units Min. Typ. Max. Min. Typ. Max. 37.6 40 42.4 37.6 ±0.3 ± 1 ±3 ±6 150 350 350 1.7 2.0 2.2 1.7 3.0 3.5 3.0 0.3 0.5 1.0 0.3 1.2 2.0 2.8 1.2 1.0 2.5 0.5 1 60 1 3.8 60 50 75 2 0.2 5.6 75 60 5 10 1 60 1 0.5 3.8 60 50 0 45 0.6 49 0.9 3.3 .05 50 0.4 0.4 19 18 0.2 1.0 7 100 50 0.2 14 45 0.6 3.6 2.0 80 0.6 1.0 25 49 0.9 3.3 .05 50 0.4 0.4 19 18 0.2 1.0 7 100 50 0.2 14 40 ±1 ±3 42.4 ±2 ±6 150 2.2 1.0 2.8 2.5 10 10 1 KHz % % Hz KHz mA V µs V mA mV µA µA dB MHz V V dB dB % % V V µA µA V mA V V V V V µA ns ns µs mA
Oscillator Section (Note 4) Initial Accuracy TJ = 25°C Voltage Stability VIN = 8V to 35V Temperature Stability (Note 3) MIN TJ MAX RT = 150K, CT = 0.1µF Minimum Frequency (Note 3) Maximum Frequency (Note 3) RT = 2K, CT = 1nF IRT = 2mA Current Mirror Clock Amplitude Clock Width TJ = 25°C Sync Threshold Sync Voltage = 3.5V Sync Input Current Error Amplifier Section (VCM = 5.1V) Input Offset Voltage Input Bias Current Input Offset Current DC Open Loop Gain RL 10M, TJ = 25°C Gain-Bandwidth Product (Note 3) AV = 0dB, TJ = 25°C Output Low Level Output High Level VCM = 1.5V to 5.2V Common Mode Rejection VIN = 8V to 35V Supply Voltage Rejection P.W.M. Comparator Section (Note 4) VCOMP = 0.6V Minimum Duty Cycle Maximum Duty Cycle VCOMP = 3.6V Input Threshold (Note 4) Zero Duty Cycle Maximum Duty Cycle Input Bias Current Soft-Start Section Soft Start Current VSHUTDOWN = 0V Soft Start Voltage VSHUTDOWN = 2V VSHUTDOWN = 2.5V Shutdown Input Current Output Drivers Section (each transistor, V C = 20V) Output High Level ISOURCE = 20mA ISOURCE = 100mA Output Low Level ISINK = 20mA ISINK = 100mA Undervoltage Lockout VCOMP and V SS = High Collector Leakage (Note 5) VC = 35V Rise Time CL = 1nF, TJ = 25°C Fall Time CL = 1nF, TJ = 25°C Shutdown Delay (Note 3) VSD = 3V, CS = 0, TJ = 25°C Total Standby Current Standby Current VIN = 35V
2.0 3.5 0.5 2.0 1.0 2 1 75 2 0.2 5.6 75 60
0.5
0
3.6 2.0 80 0.6 1.0
25
18 17
18 17 0.4 2.2 8 200 600 300 0.5 20
6
6
0.4 2.2 8 200 600 300 0.5 20
11/91 Rev 1.4 10/02
Copyright © 1996
3
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
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