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