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TC96C555EOA 데이터시트(PDF) 8 Page - TelCom Semiconductor, Inc |
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TC96C555EOA 데이터시트(HTML) 8 Page - TelCom Semiconductor, Inc |
8 / 9 page 4-166 TELCOM SEMICONDUCTOR, INC. TC96C555 3A OUTPUT PROGRAMMABLE POWER OSCILLATOR APPLICATIONS (Cont.) Figure 5. +5V Buck Regulator Power Supply with 82% Efficiency at 200mA Output 900 700 500 400 300 200 100 20 60 80 10 C in pF Maximum Frequency RCHG = 13K, Rdis = 6.8K 40 100 100K 10K 1K 100 10 1 0.1 100pF .01 µF.1µF 10pF C in pF .001 µF 1 µF Minimum Frequency RCHG = 200K, Rdis = 100K 30 50 This circuit will convert a 6 to 15V input to a 5V output of 200 milliamps. Normal operating frequency is 50kHz. Peak to peak ripple is 50 millivolts. A change from 100mA to 200mA produces a 50mV peak change in VOUT, with recov- ery in 200 µs. The TC96C555 is used here as a duty cycle modulator in a buck output circuit. The source current is modulated to control the duty cycle. Sink current is fixed at 100 µA with a resistor (R4) of 10K. Transistor Q1, (2N2907A), is used for current modulation into TC96C555 Pin 4, the charge current program input. Shunt regulator TL431 is used for voltage sense and regulation feedback. The TL431 has an internal reference of 2.495V. Terminal R is compared with this reference to control conduction of cathode C to anode A. R2 and R3 are selected to give proper bias current to the TL431. C2 and R7 are for loop compensation and are optimized for a recovery time of 200 µs. The TC96C555 outputs, Pin 7 and 6, are tied together so that when output is HIGH, current conducts from VDD Pin 8 to output Pin 7 to charge the inductor, L1. When output is OFF or LOW, energy stored in L1 will continue to conduct through TC96C555 Pin 6 to the lower internal MOSFET and out to Pin 5, the ground return. This circuit does not have current limiting. A fuse is recom- mended for protection. Figure 6 shows the duty cycle as a function of the source current. Figure 8 shows the frequency vs control voltage. Figure 4. Typical Maximum and Minimum Operating Frequency vs. Capacitor VR1 VREF VR2 VIN 1 3 5 TC96C555 OUT OUT VDD GND C1 470pF 2 4 C R A TL431 100K R7 C2 .1 µF 10K R6 6 C3 100 µF 7 10K R5 VOUT L1, 3mH R3, 390 Ω +12V C5 100 µF C4 .1 µF R2 560 Ω R1 10K Q1 2N2907A 8 R4 10K C6 4.7 µF |
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