IP1525A SEME-LAB | Alldatasheet

Document overview

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Technical content

FEATURES

  • 8 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 PWM to prevent multiple pulses
  • Dual source/sink output drivers +V IN Input Voltage Collector Voltage Logic Inputs Analogue Inputs Output Current, Source or Sink Reference Output Load Current Oscillator Charging Current P D Power Dissipation T A = 25°C Derate @ TA > 50°C PD Power Dissipation T C = 25°C Derate @ TC > 25°C TJ Operating Junction Temperature TSTG Storage Temperature Range TL Lead Temperature (soldering, 10 seconds) +40V +40V –0.3 to +5.5V –0.3 to +VIN 500mA Internally Limited 5mA 10mW/°C 16mW/°C See Ordering Information –65 to +150°C +300°C ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated) TOP VIEW J Package – 16 Pin Ceramic DIP N Package – 16 Pin Plastic DIP D Package – 16 Pin Plastic (300) SOIC INV. INPUT N. I. INPUT OSC. OUTPUT SOFT START DISCHARGE SYNC VREF VIN OUTPUT B GROUND SHUTDOWN COMPENSATION CV OUTPUT A CT RT Part J–Pack N–Pack D–16 Temp. Number 16 Pin 16 Pin 16 Pin Range IP1525A ✔ -55 to +125°C IP1527A ✔ -55 to +125°C IP3525A ✔✔✔ 0 to +70°C IP3527A ✔✔✔ 0 to +70°C Order Information Note: To order, add the package identifier to the part number. eg. IP1525AJ IP3527AD–16

Q Q PWM INV. INPUT N.I. INPUT ERROR AMP T T OSCILLATOR R C OSC. OUTPUT TO INTERNAL CIRCUITRY VREF REFERENCE REGULATOR GND +VIN SYNC DISCHARGE +VIN COMPENSATION SOFT START

8 VREF

50µA SHUTDOWN 10 5kΩ U.V. LOCKOUT FLIP FLOP S R LATCH OUTPUT A VC OUTPUT B 5kΩ IP1525A OUTPUT STAGE OUTPUT A VC OUTPUT B IP1527A OUTPUT STAGE +8 to +35V +4.5 to +35V 0 to 100mA 0 to 400mA 0 to 20mA 100Hz to 400kHz 2kΩ to 200kΩ 470pF to 0.1µF 0 to 500Ω –55 to +125°C 0 to +70°C RECOMMENDED OPERATING CONDITIONS BLOCK DIAGRAM VIN Input Voltage Collector Voltage Sink/Source Load Current (Steady State) Sink/Source Load Current (Peak) Reference Load Current Oscillator Frequency Range R T Oscillator Timing Resistor C T Oscillator Timing Capacitor Deadtime Resistor Range Operating Ambient Temperature Range IP1525A / IP1527A IP3525A / IP3527A

DESCRIPTION

The IP1525A and IP1527A families of PWM switching regulator control circuits offer improved performance and lower parts count when used in designing switching power supplies. Included are 5.1 volt reference, error amplifier, adjustable dead-time oscillator with synchronisation capability, latched PWM comparator, totem-pole output drivers, shutdown, soft start, and undervoltage lockout. The IP1525A and IP1527A differ only in output phasing. The IP1525A output is low when “off”, while the IP1527A output is high when “off”.

T J = 25°C VIN = 8 to 35V IL = 0 to 20mA Over Line, Load and Temp. VREF = 0 f = 10 Hz to 10kHz VIN = 8 to 35V R T = 200kΩ C T = 0.1µF R T = 2kΩ C T = 470pF IRT = 2mA TJ = 25°C Sync Voltage = 3.5V R L ≥ 10M Ω TJ = 25°C LAB SEME IP1525A SERIES IP1527A SERIES IP1525A IP3525A IP1527A IP3527A ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated) 5.0 5.1 5.2 22 0 55 0 20 50 4.95 5.25 80 100 40 200 15 0 90 120 400 600 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 21 0 11 0 60 75 5.05 5.10 5.15 21 0 55 0 20 50 5.0 5.2 80 100 40 200 11 0 0.3 1 90 120 400 600 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 11 0 60 75 V mV mV V mA µVrms mV kHr Hz kHz mA V µs V mA mV µA dB MHz REFERENCE SECTION OSCILLATOR SECTION 2 ERROR AMPLIFIER SECTION 3 NOTES 1. Test Conditions unless otherwise stated: VIN = 20V TJ = –55 to +125°C for IP1525A / IP1527A TJ = 0 to +70°C for IP3525A / IP3527A 2. Oscillator Section Test Conditions: fOSC = 40kHz (R T = 3.6kΩ , CT = 0.01µF , RD = 0) 3. Error Amplifier Section Test Condition: VCM = 5.1V 4. Output Driver Section Test Condition: VC = 20V

VCM = 1.5 to 5.2V VIN = 8 to 35V VPIN1 – VPIN2 ≥ 150mV VPIN2 – VPIN1 ≥ 150mV Zero Duty Cycle Max. Duty Cycle V SHUTDOWN = 0V VSHUTDOWN = 2V To Outputs V SHUTDOWN = 2.5V VSHUTDOWN = 2.5V T J = 25°C ISINK = 20mA ISINK = 100mA ISOURCE = 20mA ISOURCE = 100mA VCOMP = High VC = 35V C L = 1nF T J = 25°C C L = 1nF T J = 25°C VIN = 35V Output Low Level Output High Level Common Mode Rejection Supply Voltage Rejection Minimum Duty Cycle Maximum Duty Cycle Input Threshold Input Threshold Input Bias Current Soft Start Current Soft Start Low Level Shutdown Threshold Shutdown Input Current Shutdown Delay Output Low Level Output High Level Undervoltage Lockout Output Leakage Rise Time Fall Time Supply Current IP1525A IP3525A IP1527A IP3527A 0.2 0.5 3.8 5.6 60 75 50 60 45 49 0.6 0.9 3.3 3.6 0.05 1.0 25 50 80 0.4 0.6 0.6 1.3 2.0 0.1 1.0 0.2 0.5 0.2 0.4 1.0 2.0 18 19 17 18 578 200 100 600 50 300 10 20 0.2 0.5 3.8 5.6 60 75 50 60 45 49 0.6 0.9 3.3 3.6 0.05 1.0 25 50 80 0.4 0.6 0.6 1.3 2.0 0.1 1.0 0.2 0.5 0.2 0.4 1.0 2.0 18 19 17 18 578 200 100 600 50 300 10 20 V dB V µA µA V mA µs V V V µA ns mA LAB SEME IP1525A SERIES IP1527A SERIES NOTES 1. Test Conditions unless otherwise stated: VIN = 20V TJ = –55 to +125°C for IP1525A / IP1527A TJ = 0 to +70°C for IP3525A / IP3527A 2. Oscillator Section Test Conditions: fOSC = 40kHz (R T = 3.6kΩ , CT = 0.01µF , RD = 0) 3. Error Amplifier Section Test Condition: VCM = 5.1V 4. Output Driver Section Test Condition: VC = 20V ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated) PWM COMPARATOR ERROR AMPLIFIER SECTION (cont.) 3 SHUTDOWN SECTION OUTPUT DRIVERS (each output) 4 TOTAL STANDBY CURRENT

A B IP1525A +V C GND +V SUPPLY RETURN T1Q1 LAB SEME IP1525A SERIES IP1527A SERIES APPLICATIONS INFORMATION TO OUTPUT FILTER A B IP1525A +V C GND +V SUPPLY RETURN A B IP1525A +V C GND +V SUPPLY RETURN A B IP1525A +V C GND +V SUPPLY RETURN For single–ended supplies, the driver outputs are grounded. The VC terminal is switched to ground by the totem–pole source transistors on alternate oscillator cycle. In conventional push–pull bipolar designs, forward base drive is controlled by R1–R3. Rapid turn–off times for the power devices are achieved with speed–up capacitors C1 and C2. Low power transformers can be driven directly by the IP1525A. Automatic reset occurs during deadtime when both ends of the primary winding are switched to ground. The low source impedance of the output drivers provides rapid charging of power FET input capacitance while minimis- ing external components.

CHARGE TIME (µs) 100 200 ms 10 ms 2 5 20 50 10 200 500 100 2 ms ms R TIMING RESISTOR (kΩ )T C = 1nF T C = 2nF T C = 5nF T C = 0.01µF T C = 0.02µF T C = 0.05µF T C = 0.1µF T RT R D C T DISCHARGE TIME (µs) 100 200 300 400 500 R DEADTIME RESISTOR (Ω )D C = 1nF T C = 2nF T C = 5nF T C = 0.01µF T C = 0.02µF T C = 0.05µF T C = 0.1µF T 0.2 1 10 100 2000.5 5 22 0 5 0 TYPICAL PERFORMANCE CHARACTERISTICS Oscillator Charge Time vs R T and CT Oscillator Discharge Time vs. R D and CT FREQUENCY (Hz) C = 1nF P C = 0 P -20 100 1 10 100 1k 10k 100k 1M 10M R = 20kΩZ R = 0 Z VOLTAGE GAIN (dB) C P RZ OUTPUT CURRENT, SOURCE or SINK (A) SATURATION VOLTAGE (V) V = 20VIN T = 25˚CA SOURCE SAT, V - VOHC SINK SAT, VOL Error Amplifier Open–Loop Frequency Response IP1525A Output Saturation Characteristics