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Part: SG3524B
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: Regulating Pulse Width Modulator
Company: Microsemi Corporation
Datasheet: Download SG3524B datasheet File size : 1010 kB
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Datasheet text preview:
SG1524B/SG2524B/SG3524B
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
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.
FEATURES
· · · · · · · · · · · 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
+V I N GROUND
Reference Regulator
Undervoltage Lockout OSC
To Internal Circuitry RT CT Oscillator
COLLECTOR A
S T R INVERTING Error NON-INVERTING +V I N +C.L. SENSE C.L. -C.L. SENSE P.W.M. D Q PWM LATCH S Q Q
Q Q TOGGLE F/F
EMITTER A
COLLECTOR B
MEMORY F/F
EMITTER B
COMPENSATION
SHUTDOWN
2/00 Rev 1.3 2/00
Copyright 2000
1
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524B/SG2524B/SG3524B
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage (+VIN) .......... 42V Collector Voltage .... 60V Logic Inputs .......... .3V to 5.5V -0 Current Limit Sense Inputs ....0.3V to VIN Output Current (each transistor) ......... 200mA Reference Load Current ..... 50mA
Note 1. Values beyond which damage may occur.
Oscillator Charging Current ....5mA Operating Junction Temperature 1 Hermetic (J, L Packages) ........... 50°C 1 Plastic (N, DW Packages) .......... 50°C Storage Temperature Range ....65°C to 150°C Lead Temperature (Soldering, 10 seconds) ..........300°C
THERMAL DATA
J Package: Thermal Resistance-Junction to Case, JC ......... 30°C/W Thermal Resistance-Junction to Ambient, JA ...... 80°C/W N Package: Thermal Resistance-Junction to Case, JC ......... 40°C/W Thermal Resistance-Junction to Ambient, JA ..... 65°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
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) ...... 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.
Oscillator Frequency Range ...... 100Hz to 400KHz Oscillator Timing Resistor (RT) ....... 2K to 150K 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
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 Undervoltage Lockout Section Threshold Voltage
Note 3. IL = 0mA
Test Conditions TJ = 25°C VIN = 7V to 40V IL = 0 to 20mA Over Operating Temperature Range Over Line, Load and Temperature VREF = 0V
SG1524B/2524B SG3524B Units M i n . Typ. M a x . M i n . Typ. M a x . 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 5 0 120 2 5 5 0 120 4.3 4.5 4.7 4.2 4.5 4.9 V mV mV mV V mA V
2/00 Rev 1.3 2/00
Copyright 2000
2
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524B/SG2524B/SG3524B
ELECTRICAL CHARACTERISTICS (continued)
Parameter Test Conditions SG1524B/2524B SG3524B Units M i n . Typ. M a x . M i n . Typ. M a x . 42 45 0.1 1 50 600 3.5 1 4.0 0.5 0.5 1 60 3.8 70 76 1 78 0.2 4.2 90 100 2 48 1 2 140 3.9 0.6 3.0 0.2 40 45 0.1 1 50 600 3.5 1 4.0 0.5 2 1 60 0.5 3.8 70 76 1 0 45 180 49 200 -3 220 -10 45 170 49 200 -3 230 -10 78 0.2 4.2 90 100 2 50 1 2 120 3.9 KHz % % Hz KHz V V V µs mV µA µA dB V V dB dB MHz % % mV µA V mA V µA V V V V µs µs mA
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 = 150K, CT = 0.1µF Maximum Frequency RT = 2K, 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 2K Input Bias Current Input Offset Current DC Open Loop Gain RL 10M 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 = 2K, TA = 25°C Collector Voltage Fall Time RC = 2K, TA = 25°C Power Consumption Standby Current
Note 4. Note 5. Note 6. Note 7.
400 0.6 3.0 0.2
400
1.2 5 5 1
1.2 10 10 1 0.5
0
2.0 0.1 1 0.6 50 0.4 2.0
2.0 0.1 1 0.6 50 0.4 2.0
17.5 17
0.2 1.0 19 18 0.2 0.1 5
17.5 17 0.5 0.2 12
0.2 1.0 19 18 0.2 0.1 5
0.5 0.2 12
VIN = 40V, VSHUTDOWN = 2.0V
FOSC = 45KHz (RT = 2700, 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.
2/00 Rev 1.3 2/00
Copyright 2000
3
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
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