전자부품 데이터시트 검색엔진 |
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CA1524F 데이터시트(PDF) 8 Page - Intersil Corporation |
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CA1524F 데이터시트(HTML) 8 Page - Intersil Corporation |
8 / 16 page 8 CA1524, CA2524, CA3524 of the output duty cycle as a function of the voltage at terminal 9 are shown in Figure 7. To synchronize two or more CAl524’s, one must be designated as master, with RT CT set for the correct period. Each of the remaining units (slaves) must have a CT of 1/2 the value used in the master and approximately a 1010 longer RTCT period than the mas- ter. Connecting terminal 3 together on all units assures that the master output pulse, which occurs first and has a wider pulse width, will reset the slave units. FIGURE 5. TYPICAL OSCILLATOR PERIOD AS A FUNCTION OF RT AND CT Error AmplIfIer Section The error amplifier consists of a differential pair (Q56,Q57) with an active load (Q61 and Q62) forming a differential transconductance amplifier. Since Q61 is driven by a constant current source, Q62, the output impedance ROUT, terminal 9, is very high ( ≅ 5MΩ). The gain is: AV = gmR = 8 lC R/2KT = 10 4, Since ROUT is extremely high, the gain can be easily reduced from a nominal 104 (80dB) by the addition of an external shunt resistor from terminal 9 to ground as shown in Figure 6. FIGURE 6. OPEN-LOOP ERROR AMPLIFIER RESPONSE CHARACTERISTICS. where R = ROUT RL , RL = ∞, AV ∝ 10 4 ROUT + RL 105 104 103 1 10 102 103 104 OSCILLATOR PERIOD, t ( µs) TA = +25 oC V+ = 8V - 40V CT = 0.01µF CT = 0.002µF CT = 0.005µF CT = 0.001µF CT = 0.02µF CT = 0.05µF CT = 0.1µF 80 70 60 50 40 0o 90o RL = ∞ RL = 3MΩ RL = 1MΩ RL = 300kΩ RL =100kΩ OPEN LOOP PHASE OPEN LOOP GAIN 10 102 103 104 105 50 FREQUENCY (Hz) The output amplifier terminal is also used to compensate the system for ac stability. The frequency response and phase shift curves are shown in Figure 7. The uncompensated amplifier has a single pole at approximately 250Hz and a unity gain cross-over at 3MHz. Since most output filter designs introduce one or more additional poles at a lower frequency, the best network to stabilize the system is a series RC combination at terminal9 to ground. This network should be designed to introduce a zero to cancel out one of the output filter poles. A good start- ing point to determine the external poles is a 1000-pF capacitor and a variable series 50-K Ω potentiometer from terminal 9 to ground. The compensation point is also a convenient place to insert any programming signal to override the error amplifier. internal shutdown and current limiting are also connected at terminal 9. Any external circuit that can sink 200 µA can pull this point to ground and shut off both output drivers. While feedback is normally applied around the entire regula- tor, the error amplifier can be used with conventional operational amplifier feedback and will be stable in either the inverting or non-inverting mode. Input common-mode limits must be observed; if not, output signal inversion may result. The internal 5V reference can be used for conventional regu- lator applications if divided as shown in Figure 8. If the error amplifier is connected as a unity gain amplifier, a fixed duty cycle application results. FIGURE 7. TYPICAL DUTY CYCLE AS A FUNCTION OF COMPARATOR VOLTAGE (AT TERMINAL 9). FIGURE 8. TYPICAL OUTPUT SATURATION VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE. 48 40 32 24 16 8 0 COMPARATOR VOLTAGE (V) 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4 TA = +25 oC V+ = 20V CT = 2700pF RT = 6.19k fOSC = 60kHz CT =1000pF RT = 5k fOSC = 20kHz 1.1 1.0 0.9 0.8 0.7 -75 -50 -25 0 25 50 75 100 125 150 175 AMBIENT TEMPERATURE (oC) |
유사한 부품 번호 - CA1524F |
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유사한 설명 - CA1524F |
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