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| IP1842 SERIES IP1843 SERIES TOP VIEW COMP 1 V FB 2 I SENSE 3 R T /C T 4 8 7 6 5 VREF VCC OUTPUT GROUND CURRENT MODE REGULATING PULSE WIDTH MODULATORS FEATURES * * * * * Guaranteed 1% reference voltage tolerance Guaranteed 10% frequency tolerance Low start-up current (<500 mA) Under voltage lockout with hysteresis Output state completely defined for all supply and input conditions * Interchangeable with UC1842 and UC1843 series for improved operation * 500kHz operation J Package - 8 Pin Ceramic DIP N Package - 8 Pin Plastic DIP D-8 Package - 8 Pin Plastic (150) SOIC TOP VIEW COMP 1 N/C 2 14 13 12 11 10 9 8 VREF N/C VCC VC OUTPUT GROUND POWER GROUND V FB 3 N/C 4 I SENSE 5 N/C 6 R T /C T 7 D-14 Package - 14 Pin Plastic (150) SOIC Order Information Part Number IP1842 IP2842 IP3842 IP1843 IP2843 IP3843 J-Pack 8 Pin N-Pack 8 Pin D-8 8 Pin D-14 14 Pin Temp. Range -55 to +125C -25 to +85C 0 to +70C -55 to +125C -25 to +85C 0 to +70C Note: To order, add the package identifier to the part number. eg. IP1842J IP3843D-14 ABSOLUTE MAXIMUM RATINGS (Tcase = 25C unless otherwise stated) VCC IO Supply Voltage Output Current Output Energy Analog Inputs Error Amp Output Sink Current Power Dissipation Derate @ Tamb > 50C Power Dissipation Derate @ Tcase > 25C Storage Temperature Range Lead Temperature (low impedance source) (ICC < 30mA) (capacitive load) (pins 2 and 3) Tamb = 25C Tcase = 25C +30V Self limiting 1A 5mJ -0.3V to +VCC 10mA 1W 10mW/C 2W 24mW/C -65 to 150C +300C Prelim.3/00 PD PD TSTG TL (soldering, 10 seconds) Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk IP1842 SERIES IP1843 SERIES DESCRIPTION The IP1842 and IP1843 series of switching regulator control circuits contain all the functions necessary to implement off-line, current mode switching regulators, using a minimum number of external parts. Functions included are voltage reference, error amplifier, current sense comparator, oscillator, totem pole output driver and under-voltage lockout circuitry. Although pin compatible with the UC1842 and 1843 series, SEMELAB has incorporated several improvements in the IP1842 and IP1843 series allowing tighter and more complete specification of electrical performance. BLOCK DIAGRAM VCC 7/12 34V GND 5/9 UNDER-VOLTAGE LOCKOUT ENABLE REFERENCE 5V REGULATOR INTERNAL BIAS 2.5V REG 8/14 VREF 16V (8.4V) 6V (0.5V) S R 3.6V R T /CT 4/7 VREF STATUS LATCH 7/11 VC 6/10 OSCILLATOR ERROR AMP OUTPUT 2R R 1V S R CURRENT SENSE COMPARATOR PWM LATCH 5/8 V FB COMP I SENSE 2/3 POW ER GROUND 1/1 3/5 Values in brackets are for IP1843 series. PIN NUMBERS 1st Number - N, J and 8 Pin D Packages 2nd Num ber - 14 Pin D Package. RECOMMENDED OPERATING CONDITIONS VCC IO Supply Voltage 1 Output Current Analog Inputs (pins 2 and 3) IP1842 , IP1843 IP2842 , IP2843 IP3842 , IP3843 Error Amp Output Sink Current Operating Ambient Temperature Range 30V 0 to 200mA -0.3V to 3V 0 to 2mA -55 to 125C -25 to 85C 0 to 70C Notes: 1. Lower limit set by under voltage lockout specification. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Prelim.3/00 IP1842 SERIES IP1843 SERIES ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated) IP1842/IP1843 IP2842/IP2843 Min. Typ. Max. TJ = 25C Parameter Output Voltage Input Regulation Output Regulation Temperature Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short Circuit Current Frequency Voltage stability Temperature Stability Amplitude Discharge Current Test Conditions REFERENCE SECTION IO = 1mA VCC = 12V to 25V IO = 1mA to 20mA Min. 4.90 IP3842 IP3843 Typ. 5.00 6 6 0.2 Max. Units 5.10 20 25 0.4 5.18 V mV mV C V mV 4.95 5.00 6 6 0.2 5.05 20 25 0.4 5.10 Line, Load, Temp f = 10Hz to 10kHz TJ = 25C TJ = 125C @ 1000Hrs VREF = 0 4.90 50 5 30 80 4.82 50 5 30 80 25 160 25 160 mV mA OSCILLATOR SECTION TJ = 25C VCC = 12V to 25V DT 47 52 0.2 5 1.7 8.3 8 57 1 47 52 0.2 5 1.7 8.3 8 57 1 kHz % % V mA % A = Min to Max VPIN4 Peak to Peak TJ = 25C DT A = Min to Max ERROR AMP SECTION Input Voltage Input Bias Current Open Loop Voltage Gain Unity Gain Bandwidth Supply Voltage Rejection Output Sink Current Output Source Current VOUT High VOUT Low VCC = 12V to 25V VPIN2 = 2.7V VPIN2 = 2.3V VPIN2 = 2.3V VPIN2 = 2.7V VPIN1 = 1.1V VPIN1 = 4.6V RL = 15kW RL = 15kW VO = 2V to 4V VPIN1 = 2.5V 2.45 2.50 -0.3 2.55 -1 2.42 2.50 -0.3 2.58 -2 V mA 65 0.7 60 2 -0.5 4.6 90 1 70 6 -0.8 4.8 0.7 1.1 65 0.7 60 2 -0.5 4.6 90 1 70 6 -0.8 4.8 0.7 1.1 dB MHz dB mA V NOTES 1. Test Conditions unless otherwise stated: VCC = 15V* , RT = 10kW , CT = 3.3nF , f = 52kHz. *Adjust VCC above start threshold before setting at required level. All specifications apply over the full operating temperature range unless otherwise stated. (See Ordering Information for further details). Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Prelim.3/00 IP1842 SERIES IP1843 SERIES ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated) IP1842/IP1843 IP2842/IP2843 Min. Typ. Max. 2.85 (Note 2) Parameter Gain Maximum Input Signal Supply Voltage Rejection Input Bias Current Delay to Output Test Conditions CURRENT SENSE SECTION See Notes 2,3 VPIN1 = 4.6V VC = 12V to 25V Min. 2.85 0.9 60 IP3842 IP3843 Typ. 3 1 70 -2 200 0.1 1.5 Max. Units 3.15 1.1 V/V V dB -10 400 0.4 2.2 mA 3 1 70 -2 200 3.15 1.1 0.9 60 -10 400 0.4 2.2 13 12 150 150 1.1 17 9 11 8.2 0.5 15 17 40 30 14.5 7.8 8.5 7 ns OUTPUT SECTION Output Low Level Output High Level Rise Time Fall Time UVLO Saturation Upper Threshold (VCC) Lower Threshold (VCC) Start-up Current Operating Supply Current VCC Zener Voltage VPIN2 = 0V VPIN3 = 0V ICC = 25mA 1842 Series 1843 Series ISINK = 20mA ISINK = 200mA ISOURCE = 20mA ISOURCE = 200mA CL = 1nF CL = 1nF VCC = 6V 1842 Series 1843 Series 1842 Series 1843 Series TJ = 25C TJ = 25C IL = 1mA 0.1 1.5 13 12 13.5 13.5 50 50 0.7 15 7.8 9 7 16 8.4 10 7.6 0.3 11 14 30 34 V V 13.5 13.5 50 50 0.7 16 8.4 10 7.6 0.3 11 14 34 150 150 1.1 17.5 9 11.5 8.2 0.5 15 17 40 ns V UNDER-VOLTAGE LOCKOUT SECTION V V TOTAL STANDBY CURRENT mA mA V NOTES 1. Test Conditions unless otherwise stated: VCC = 15V* , RT = 10kW , CT = 3.3nF , f = 52kHz. *Adjust VCC above start threshold before setting at required level. All specifications apply over the full operating temperature range unless otherwise stated. (See Ordering Information for further details). 2. Parameter measured at trip point of latch with VPIN2 = 0V 3. Gain defined as: A= DV DV PIN1 PIN3 0 VPIN3 0.8 Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Prelim.3/00 IP1842 SERIES IP1843 SERIES APPLICATIONS INFORMATION Oscillator Waveforms and Maximum Duty Cycle COMP 1 V FB 2 I SENSE 3 R T /C T 4 8 7 6 5 VREF VCC OUTPUT GROUND Oscillator timing capacitor C T is charged by V REF tc 0.55 RTCT through RT and discharged by an internal current source. .0063 RT - 2.3 During the discharge time, the internal clock signal td RTCT Rn .0063 - 4 blanks the output to the low state. Selection of RT and 1 CT therefore determines both oscillator frequency and Resultant frequency f = (tc + td) maximum duty cycle. Charge and discharge times are determined by the formulae: For RT > 5kW, Resultant frequency f 1.8 (RTCT) ( ) Open-Loop Laboratory Test Fixture COMP 1 N/C 2 14 13 12 11 10 9 8 VREF N/C VCC VC OUTPUT GROUND POWER GROUND V FB 3 N/C 4 I SENSE 5 N/C 6 R T /C T 7 High peak current associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The transistor and 5K potentiometer are used to sample the oscillator wave form and apply an adjustable ramp to pin 3. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Prelim.3/00 IP1842 SERIES IP1843 SERIES TYPICAL PERFORMANCE CHARACTERISTICS COMP 1 V FB 2 I SENSE 3 R T /C T 4 8 7 6 5 VREF VCC OUTPUT GROUND COMP 1 N/C 2 14 13 12 11 10 9 8 VREF N/C VCC VC OUTPUT GROUND POWER GROUND V FB 3 N/C 4 I SENSE 5 N/C 6 R T /C T 7 Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Prelim.3/00 |
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