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APW7158 Datasheet(PDF) 15 Page - Anpec Electronics Coropration |
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APW7158 Datasheet(HTML) 15 Page - Anpec Electronics Coropration |
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15 / 24 page  Copyright © ANPEC Electronics Corp. Rev. A.2 - Aug., 2009 APW7158 www.anpec.com.tw 15 Function Description (Cont.) Oscillator The APW7158 provides the oscillator switching frequency adjustment. Connect a resistor from FS pin to the ground; the nominal 300kHz oscillator switching frequency is increased according to the value of the resistor. Thus, the adjustment range of the switching frequency is nomi- nal 300kHz to 800kHz. Conversely, connecting a resistor from FS pin to the VCC12 pin reduces the switching fre- quency according to the value of the resistor. Thus, the adjustment range of the switching frequency is 70kHz to nominal 300kHz. (See Figure 4.). Short-Circuit Protection The APW7158 has a simple short-circuit protection to monitor COMP1 pin and COMP2 pin for OUT1 and OUT2. When output voltage has a short, the FB pin should start to follow output since it is a resistor divider from the output. The FB pin is the inverting input of Error-Amp. When FB pin is lower than the Error-Amp reference, the V COMP will rise to increase the duty-cycle of the upper MOSFET gate driver, and this allows output to get higher voltage. If the short-circuit condition is long enough, the V COMP will ex- ceed the trip point 3.3V and the duty circle will hit the maximum. This means that either Over-Current or Un- der-Voltage condition is detected. If any of the V COMP1 and V COMP2 exceed their trip points and hold over a filter time (1-2 clock cycles of switching frequency), all regulators will shut down and require a POR on either of VCC or VCC12 pin to restart. Figure 3. Optional R for Shunt Regulator 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 Switching Frequency (kHz) FS to VCC12 FS to GND Figure 4. FS Resistance vs. Frequency VCC(5.8V) VCC12 R VCC12 VCC APW7158 Shunt Regulator (Cont.) |
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