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UPC1934 Datasheet(PDF) 10 Page - NEC |
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UPC1934 Datasheet(HTML) 10 Page - NEC |
10 / 20 page Data Sheet G13567EJ3V0DS00 10 µµµµ PC1934 2. CONFIGURATION AND OPERATION OF EACH BLOCK Figure 2-1 Block Diagram 2.1 Reference Voltage Generator The reference voltage generator is comprised of a band-gap reference circuit, and outputs a temperature-compensated reference voltage (2.1 V). The reference voltage can be used as the power supply for internal circuits, or as a reference voltage, and can also be accessed externally via the VREF pin (pin 16). 2.2 Oscillator The oscillator self-oscillates if a timing resistor is attached to the RT pin (pin 2). Also, the oscillator outputs the symmetrical triangular waveform if a timing capacitor is attached to the CT pin (pin 1). This oscillator waveform is input to the non-inverted input pins of the two PWM comparators to determine the oscillation frequency. 8 10 Error amplifier Output section PWM comparator SCP comparator OUT2 DTC2 FB2 II2 7 Error amplifier Output section PWM comparator OUT1 DTC1 FB1 II1 1 CT 2 RT Oscillation section SQ Q GND DLY CDLY 15 0.63 V 9 VCC 11 12 13 6 5 4 16 VREF Q2 Q1 Reference voltage section Under voltage lock-out section IN1 3 IN2 14 Timer latch for short-circuit protection section |
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