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| KA7500 Description The KA7500 incorporate on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit. Designed primarily for power supply control ,these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to hos application. The K A7500 contains an error amplifier , anon-chip adjustable oscillator ,a dead- time control comparator ,pulse-steering control flip-flop ,a 5-volt, 1% precision regulator , and output-control circuits. The error amplifier exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts .The dead time control comparator has a fixed offset that provides approximately 5% deed time when externally altered. The on-chip oscillator may be bypassed by terminating RT (pin 6 ) to the reference output and providing a sawtooth input to Ct (pin 5) ,or it may be used to drive the common circuits in synchronous multiple-rail power supplies . The uncommitted output transistors provide either common circuits in synchronous Power supplier.The uncommitted output transistors provide either common-emitter or emitter-follower output capability .Each device provides for push-pull or single-ended output operation, which may be selected throug h the outpu t - control function . Th e architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. Features * Complete PWM Power Control Circuitry Uncommitted Outputs for 200 mA sink or Source Current Output control Selects Singel-Ended or Push-Pull operation * Internal Circuitry Prohibits Double Pulse at Either output * Variable Dead-Time Provides Control over Total Range Internal Regulator Provides a Stable 5-V Reference supply ,1% Circuit Architecture Allows Easy Synchronization DIP - 16 Block Digram Package BEIJING ESTEK ELECTRONICS CO.,LTD 1 KA7500 Absolute Maximum Ratings Over Operating Free-air Temerature Range (Unless Otherwise Noted) Rating Supply voltage ,Vcc Amplifier input voltage Collector output voltage Collector output current Operating free-air temperature range Storage temperature range Lead temperature 1,6 mm from case for 10 seconds Value 41 Vcc+0.3 41 250 0 to 70 -65 to 150 260 Unit V mA C Recommended Operating Conditions Parameter Supply voltage ,Vcc Amplifier input voltage ,Vi Collector output voltage ,Vo Collector output current (each transistor) Current into feedback terminal Timing capacitor ,CT Timing resistor ,RT Oscillator frequency Operating free-air temperature ,TA MIN 7 -0.3 Value MAX 40 Vcc-2 40 200 0.3 10 500 200 70 Unit V mA F k kHz C 0.0047 1.8 1 0 Electrical Characteristics Over Operating Free-air Temerature Range,Vcc=15V,f=10kHz Noted) (Unless Otherwise Reference Section Parameter Output voltage(Vref) Line regulation Load regulation Short-circuit output current*** Test conditions Io=1mA Io=1mA,TA=25C**** Vcc=7V to 40V Io=1Ma to 10mA Vref=0 MIN 4.9 4.95 Value TYP** 5 5 2 1 35 Unit MAX 5.1 5.05 25 15 50 V mV mA 10 BEIJING ESTEK ELECTRONICS CO.,LTD 2 KA7500 Oscillator section (See Figure 1) Parameter Frequency Frequency Frequency change with temperature ***** Test conditions* CT=0.01 F,RT=12K,TA=25C CT=0.01 F,RT=12K CT=0.01 F,RT=12K TA=MIN TO MAX MIN 9.2 9.0 Value TYP** 10 Unit MAX 10.8 12 2 kHz Amplifier section (See Figure 2) Parameter Input offset voltage Input offset current Input blas current Common-mode input voltage range Open-loop voltage amplification Unity-gain bandwidth Test conditions MIN Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vcc=7V to 40V Vo=3V,RL=2K, Value TYP* 2 25 0.2 95 650 Unit MAX 10 250 1 mV nA A V dB kHz -0.3 to Vcc-2 70 Output Section Parameter Collector off-state current Emitter off-state current Collector-emitter saturation voltage Output control input current Test conditions MIN VCE=40V,Ccc=40V Vcc=Vc=40V,VE=0 VE=0,Ic=200mA VC=15V,IE=-200mA VI=Vref Value TYP** 2 1.1 1.5 Unit MAX 100 -100 1.3 2.5 3.5 A V mA Common-emitter Emitter-follower Dead -Time Control - Section(See Figure 1) Parameter Input bias current (pin 4) Maximum duty cycle, each output Input threshold voltage (pin 4) Test conditions MIN VI=0 to 5.25V VI(pin 4)=0,O.C.=Vref Zero duty cycle Maximum duty cycle 45 3 0 3.3 Value TYP** -2 Unit MAX -10 A % V P M Comparator Section(See Figure 1) Parameter Test conditions MIN Zero duty cycle V(pin 3)=0.7V Value TYP** 4 0.7 Unit MAX 4.5 V mA Input threshold voltage(pin 3) Input sink current (pin 3) 0.3 BEIJING ESTEK ELECTRONICS CO.,LTD 3 KA7500 Total Device Parameter Standby supply current Pin 6 at Vref Test conditions MIN Vcc=15V Value TYP** 6 Unit MAX 10 mA Switching Characteristics, T Parameter Output voltage rise time Output voltage fall time Output voltage rise time Output voltage fall time 25 o C Test conditions MIN Value TYP** 100 25 100 25 Unit MAX 200 100 200 100 Common-emitter configuration, See figure 3 Emitter-follower configuration. See Figure 4 ns *For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. **All typical values except for parameter changes with temperature are at TA=25C ***Duration of the short-circuit should not exceed one second ****This is guaranteed where the marking code on the package surface is "A" *****Temperature coefficient of timing capacitor and timing resistor not taken into account. Parameter Measurement Information BEIJING ESTEK ELECTRONICS CO.,LTD 4 KA7500 Figure 1. Operational test circuit and waveforms Figure 2.Amplifier characteristics BEIJING ESTEK ELECTRONICS CO.,LTD 5 KA7500 Figure 3. Common - emitter configuration Figure 4. Emitter - follower configuration Ordering Information O RDERI NG NUM BER R KA7500 P ACK AGE DIP-16 M AR K ING KA7500 Address : Postalcode:100039 Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Http://www.estek.com.cn Email:sales@estek.com.cn 6A06--6A07 Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing Fax : 010-58895793 REV No:01-060816 BEIJING ESTEK ELECTRONICS CO.,LTD 6 |
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