IP1525A SERIES IP1527A SERIES SEME LAB TOP VIEW REGULATING PULSE WIDTH MODULATORS INV. INPUT 1 16 VREF N. I. INPUT 2 15 VIN SYNC 3 14 OUTPUT B OSC. OUTPUT 4 13 VC CT 5 12 GROUND RT 6 11 OUTPUT A DISCHARGE 7 10 SHUTDOWN SOFT START 8 9 COMPENSATION FEATURES J Package – 16 Pin Ceramic DIP N Package – 16 Pin Plastic DIP D Package – 16 Pin Plastic (300) SOIC • • • • • • • • • 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 Order Information Part Number IP1525A IP1527A IP3525A IP3527A J–Pack 16 Pin ✔ ✔ ✔ ✔ N–Pack 16 Pin D–16 16 Pin ✔ ✔ ✔ ✔ Temp. Range -55 to +125°C -55 to +125°C 0 to +70°C 0 to +70°C Note: To order, add the package identifier to the part number. eg. IP1525AJ IP3527AD–16 ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated) +VIN Input Voltage +40V Collector Voltage +40V Logic Inputs –0.3 to +5.5V Analogue Inputs –0.3 to +VIN Output Current, Source or Sink 500mA Reference Output Load Current Internally Limited Oscillator Charging Current 5mA PD Power Dissipation TA = 25°C Derate @ TA > 50°C 1W 10mW/°C PD Power Dissipation TC = 25°C Derate @ TC > 25°C 2W 16mW/°C TJ Operating Junction Temperature TSTG Storage Temperature Range TL Lead Temperature Semelab plc. See Ordering Information –65 to +150°C (soldering, 10 seconds) Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. +300°C Prelim. 3/95 IP1525A SERIES IP1527A SERIES SEME LAB 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”. BLOCK DIAGRAM VREF VC 16 +VIN GND 15 13 REFERENCE REGULATOR U.V. LOCKOUT 12 11 TO INTERNAL CIRCUITRY 3 FLIP FLOP OSC. OUTPUT SYNC OUTPUT A 4 RT CT DISCHARGE 6 Q 14 OSCILLATOR 5 OUTPUT B Q 7 IP1525A OUTPUT STAGE COMPENSATION N.I. INPUT SOFT START SHUTDOWN 13 S +VIN INV. INPUT VC R 9 PWM 1 LATCH 11 2 ERROR AMP 50µA VREF 8 10 OUTPUT A 5kΩ 14 OUTPUT B 5kΩ IP1527A OUTPUT STAGE RECOMMENDED OPERATING CONDITIONS VIN Input Voltage +8 to +35V Collector Voltage +4.5 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 RT Oscillator Timing Resistor CT Oscillator Timing Capacitor 100Hz to 400kHz 2kΩ to 200kΩ 470pF to 0.1µF 0 to 500Ω Deadtime Resistor Range Operating Ambient Temperature Range Semelab plc. IP1525A / IP1527A IP3525A / IP3527A Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. –55 to +125°C 0 to +70°C Prelim. 3/95 IP1525A SERIES IP1527A SERIES SEME LAB ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated) Parameter IP1525A IP1527A Min. Typ. Max. Test Conditions IP3525A IP3527A Min. Typ. Max. Units REFERENCE SECTION Output Voltage TJ = 25°C Line Regulation Load Regulation 5.05 5.1 5.2 10 2 20 5 50 5 50 20 50 20 50 mV 5.25 V 5.10 5.15 VIN = 8 to 35V 2 IL = 0 to 20mA Temperature Stability 5.0 V mV Total Output Variation Over Line, Load and Temp. Short Circuit Current VREF = 0 80 100 80 100 mA Output Noise Voltage f = 10 Hz to 10kHz 40 200 40 200 µVrms 1 10 1 50 2 6 2 6 0.3 1 1 2 3 6 3 6 90 120 90 120 5.0 Long Term Stability OSCILLATOR SECTION VIN = 8 to 35V Temperature Stability Minimum Frequency RT = 200kΩ CT = 0.1µF Maximum Frequency RT = 2kΩ CT = 470pF Current Mirror IRT = 2mA Clock Amplitude TJ = 25°C Clock Width Sync Threshold mV kHr ERROR AMPLIFIER SECTION % Hz 400 600 1.7 2.0 3.0 3.5 1.0 0.3 0.5 1.0 µs 2.0 2.8 1.2 2.0 2.8 V 1.0 2.5 1.0 2.5 mA 0.5 5 2 10 mV 1 10 1 10 400 600 1.7 2.0 3.0 3.5 0.3 0.5 1.2 Sync Voltage = 3.5V Sync Input Current 4.95 2 Initial Accuracy Voltage Stability 5.2 2.2 kHz 2.2 mA V 3 Input Offset Voltage Input Bias Current Input Offset Current 1 1 µA DC Open Loop Gain RL ≥ 10MΩ 60 75 60 75 dB Gain Bandwidth Product TJ = 25°C 1 2 1 2 MHz NOTES 1. Test Conditions unless otherwise stated: VIN = 20V TJ = –55 to +125°C for IP1525A / IP1527A for IP3525A / IP3527A TJ = 0 to +70°C 3. Error Amplifier Section Test Condition: VCM = 5.1V 4. Output Driver Section Test Condition: VC = 20V 2. Oscillator Section Test Conditions: (RT = 3.6kΩ , CT = 0.01µF , RD = 0) fOSC = 40kHz Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 3/95 IP1525A SERIES IP1527A SERIES SEME LAB ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated) Parameter Test Conditions IP1525A IP1527A Min. Typ. Max. IP3525A IP3527A Min. Typ. Max. 0.2 0.2 Units ERROR AMPLIFIER SECTION (cont.) 3 Output Low Level Output High Level 0.5 3.8 5.6 3.8 5.6 Common Mode Rejection VCM = 1.5 to 5.2V 60 75 60 75 Supply Voltage Rejection VIN = 8 to 35V 50 60 50 60 0.5 V dB PWM COMPARATOR Minimum Duty Cycle VPIN1 – VPIN2 ≥ 150mV Maximum Duty Cycle VPIN2 – VPIN1 ≥ 150mV 45 49 45 49 Input Threshold Zero Duty Cycle 0.6 0.9 0.6 0.9 Input Threshold Max. Duty Cycle 0 0 % V 3.3 3.6 3.3 3.6 0.05 1.0 0.05 1.0 µA 50 80 50 80 µA 0.4 0.6 0.4 0.6 1.3 2.0 1.3 2.0 0.1 1.0 0.1 1.0 mA 0.2 0.5 0.2 0.5 µs ISINK = 20mA 0.2 0.4 0.2 0.4 ISINK = 100mA 1.0 2.0 1.0 2.0 Input Bias Current SHUTDOWN SECTION Soft Start Current VSHUTDOWN = 0V Soft Start Low Level VSHUTDOWN = 2V Shutdown Threshold To Outputs Shutdown Input Current VSHUTDOWN = 2.5V Shutdown Delay VSHUTDOWN = 2.5V 25 0.6 TJ = 25°C OUTPUT DRIVERS (each output) Output Low Level 25 0.6 V 4 V ISOURCE = 20mA 18 19 18 19 ISOURCE = 100mA 17 18 17 18 Undervoltage Lockout VCOMP = High 5 7 5 7 Output Leakage VC = 35V Rise Time CL = 1nF TJ = 25°C 100 600 100 600 Fall Time CL = 1nF TJ = 25°C 50 300 50 300 10 20 10 20 Output High Level 8 200 V 8 V 200 µA ns TOTAL STANDBY CURRENT Supply Current VIN = 35V mA NOTES 1. Test Conditions unless otherwise stated: VIN = 20V TJ = –55 to +125°C for IP1525A / IP1527A for IP3525A / IP3527A TJ = 0 to +70°C 3. Error Amplifier Section Test Condition: VCM = 5.1V 4. Output Driver Section Test Condition: VC = 20V 2. Oscillator Section Test Conditions: (RT = 3.6kΩ , CT = 0.01µF , RD = 0) fOSC = 40kHz Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 3/95 IP1525A SERIES IP1527A SERIES SEME LAB APPLICATIONS INFORMATION Q1 + VS U P PL Y TO OU TPU T FIL TER + VS U P P L Y R1 R2 R1 13 13 + VC C1 T1 + VC A A 11 IP1525A Q1 11 R2 C2 14 R3 IP1525A B B GND GND 14 12 Q2 12 R E TU R N R E TU R N 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. + VS U P PL Y + VS U P P L Y Q1 R1 C1 T1 13 13 Q1 + VC R1 + VC T1 T2 A A 11 11 IP1525A IP1 5 2 5 A Q2 Q2 B B GND GND 14 C2 14 R2 12 12 RE TU RN RE TU RN The low source impedance of the output drivers provides rapid charging of power FET input capacitance while minimising external components. Semelab plc. 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. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 3/95 IP1525A SERIES IP1527A SERIES SEME LAB TYPICAL PERFORMANCE CHARACTERISTICS Oscillator Charge Time vs RT and CT Oscillator Discharge Time vs. RD and CT 10 5 F CT = 0.1µ CT = 0.05µ F CT = 0.02µ F CT = 5nF R D DEADTIME RESISTOR (Ω) .1µ F T C C T =0 =0 .05 µF F .02 µF .01 µ C C T T =0 =0 nF =5 T C T C 20 T =1 =2 nF nF 50 C R T TIMING RESISTOR (kΩ) 400 CT = 2n F CT = 1nF 100 CT = 0.01µ F 500 200 300 200 100 6 2 RT 5 RD 7 CT 0 0.2 1 1 2 5 10 20 50 100 200 500 1 ms 2 ms 5 10 ms ms 0.5 1 2 5 10 20 50 100 200 DISCHARGE TIME (µs) CHARGE TIME (µs) Error Amplifier Open–Loop Frequency Response IP1525A Output Saturation Characteristics 4 100 VIN = 20V T A = 25˚C SATURATION VOLTAGE (V) 60 = CP F 1n C 40 =0 P VOLTAGE GAIN (dB) 80 R Z = 20k Ω 20 1 3 2 SOURCE SAT, V C - VOH 1 9 R 2 Z CP =0 0 RZ SINK SAT, VOL 0 -20 1 10 100 1k 10k 100k 1M 10M 0.01 0.02 FREQUENCY (Hz) Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. 0.03 0.05 0.07 0.1 0.2 0.3 0.5 0.7 1 OUTPUT CURRENT, SOURCE or SINK (A) Prelim. 3/95