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GM431BT92B Datasheet(PDF) 10 Page - Gamma Microelectronics Inc. |
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GM431BT92B Datasheet(HTML) 10 Page - Gamma Microelectronics Inc. |
10 / 14 page 10 This refers to the determination of the gain frequency characteristic of the shunt regulator as an error amplifier. Taking the configuration in figure 16, the error amplifier characteristic is as shown in figure 17. AC Characteristic Determination: Figure 17. GM431 Error Amplification Characteristic G1 G2 When R = 0 5 F1 FAC F2 When R = 0 5 In Figure 17, the following formulas are obtained: Gain G = G 50 dB to 60 dB (determined by shunt regulator) 10 G = 2 Corner frequencies f = 1/(2p C G R) 11 0 3 f = 1/(2p C R) 2 1 5 G is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation 0 DVref/DV , and is approximately 50 dB. KA R5 R3 Practical Example Consider the example of a photocoupler, with an internal light emitting diode V = 1.05 V and I = 2.5 mA, F F power supply output voltage V = 5 V, and bias resistance R current of approximately 1/5 I at 0.5 mA. If 22 F the shunt regulator V = 3 V, the following values are found. K Next, assume that R = R = 10 kW. This gives a 5 V output. If R = 3.3 kW and C = 0.022 µF, the 34 5 1 following values are found. G = 3.3 kW / 10 kW = 0.33 times (–10 dB) 2 f = 1 / (2 x p x 0.022 µF x 316 x 10 kW) = 2.3 (Hz) 1 f = 1 / (2 x p x 0.022 µF x 3.3 kW) = 2.2 (kHz) 2 R = =316W 1 5V - 1.05V - 3V 2.5mA + 0.5mA R = =2.1 kW 2 1.05V 0.5mA F Frequency f (Hz) osc * : PWM switching frequency fosc A A MICROELECTRONICS GM431 2.5V ADJUSTABLE SHUNT REGULATOR Power Management |
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