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EUP3410 Datasheet(PDF) 10 Page - Eutech Microelectronics Inc |
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EUP3410 Datasheet(HTML) 10 Page - Eutech Microelectronics Inc |
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10 / 12 page  EUP3410/3411 DS3410/3411 Ver1.2 Nov. 2008 10 VOUT C7 R1 C5 C4 2.5V 22µF Ceramic 10KΩ 3.9nF None 3.3V 22µF Ceramic 10KΩ 3.9nF None 5V 22µF Ceramic 10KΩ 3.9nF None 12V 22µF Ceramic 10KΩ 3.9nF None 2.5V 560µF/6.3V (30mΩ ESR) 10KΩ 30nF None 3.3V 560µF/6.3V (30mΩ ESR) 10KΩ 39nF None 5V 470µF/10V (30mΩ ESR) 10KΩ 47nF None 12V 220µF/25V (30mΩ ESR) 10KΩ 56nF None Output Rectifier Diode The output rectifier diode supplies the current to the inductor when the high-side switch is off. A schottky diode is recommended to reduce losses due to the diode forward voltage and recovery times. Loop Compensation The system stability is controlled through the COMP pin. COMP is the output of the internal transconductance error amplifier. A series capacitor-resistor combination sets a pole-zero combination to control the feedback loop. The DC loop gain is: Where: VFB is the feedback threshold voltage, 1.2V VOUT is the desired output regulation voltage AVEA is the transconductance error amplifier voltage gain, 400 V/V GCS is the current sense gain, (roughly the output current divided by the voltage at COMP), 2A/V RLOAD is the load resistance (VOUT / IOUT where IOUT is the output load current) The system has 2 poles. One is due to the compensation capacitor (C5), and the other is due to the output capacitor (C7). These are: Where P1 is the first pole, and GEA is the error amplifier transconductance (660µA/V). and The system has one zero of importance, due to the compensation capacitor (C5) and the compensation resistor (R1). The zero is: If a large value capacitor (C7) with relatively high equivalent-series-resistance (ESR) is used, the zero due to the capacitance and ESR of the output capacitor can be compensated by a third pole set by R1 and C4. The pole is: The system crossover frequency (the frequency where the loop gain drops to 1, or 0dB) is important. A good rule of thumb is to set the crossover frequency to approximately 1/10 of the switching frequency. In this case, the switching frequency is 380KHz, therefore use a crossover frequency, fC, of 40KHz. Lower crossover frequency results in slower loop response and poor load transient performance. Higher crossover frequency can result in loop instability. Table 1. Compensation Values for Typical Output Voltage /Capacitor Combinations The values of the compensation components listed in Table 1 yield a stable control loop for the given output voltage. () 5 C A 2 / G f VEA EA 1 P ∗ ∗ π = () 7 C R 2 / 1 f LOAD 2 P ∗ ∗ π = () 5 C 1 R 2 / 1 f 1 Z ∗ ∗ π = () C4 R1 2π 1/ f P3 ∗ ∗ = () LOAD CS VEA OUT FB VDC R G A V / V A ∗ ∗ ∗ = |
Similar Part No. - EUP3410 |
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Similar Description - EUP3410 |
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