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MIC24420 Datasheet(PDF) 22 Page - Micrel Semiconductor |
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MIC24420 Datasheet(HTML) 22 Page - Micrel Semiconductor |
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Micrel, Inc. MIC24420/MIC24421 June 2012 22 M9999-062012-C The general form of the feedforward circuit is shown below. ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × + = ωp3 s 1 ωz3 s 1 R2 R1 R2 H(s) Where: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × × × × R2 R1 R2 R1 C1 π 2 = × × × = 1 fp3 C1 R1 π 2 1 fz3 H(s) Gfilter(s) Gmod Gea(s) T(s) × × × = The total open loop transfer function is: The following tables list the recommended values of compensation and filter components for different output voltages. The output capacitors are ceramic. MIC24420 VOUT R1 R2 C7/8 C16/17 R22/23 C29/30 LMIN CoMIN 1.0V 1k 2.32k 220pF 3.3nF NF NF 10µH 47µF 1.2V 1k 1.4k 220pF 3.3nF NF NF 10µH 47µF 1.4V 1k 1k 220pF 3.3nF NF NF 10µH 47µF 1.8V 1k 634 150pF 4.7nF NF NF 10µH 47µF 2.5V 1k 383 150pF 10nF NF NF 10µH 47µF 3.3V 1k 274 150pF 10nF NF NF 10µH 47µF 5.0V 1k 162 150pF 10nF NF NF 10µH 47µF MIC24421 VOUT R1 R2 C7/8 C16/17 R22/23 C29/30 LMIN CoMIN 1.0V 1k 2.32k 1000pF 22nF 22k 100nF 22µH 100µF 1.2V 1k 1.4k 1000pF 22nF 22k 100nF 22µH 100µF 1.4V 1k 1k 1000pF 22nF 22k 100nF 22µH 100µF 1.8V 1k 634 1000pF 22nF 22k 100nF 22µH 100µF 2.5V 1k 383 1000pF 22nF 22k 100nF 22µH 100µF 3.3V 1k 274 1000pF 22nF 22k 100nF 22µH 100µF 5.0V 1k 162 1000pF 22nF 22k 100nF 22µH 100µF |
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