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NCV887740D1R2G Datasheet(PDF) 14 Page - ON Semiconductor |
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NCV887740D1R2G Datasheet(HTML) 14 Page - ON Semiconductor |
14 / 15 page ![]() NCV8877 www.onsemi.com 14 Table 2. OTA COMPENSATION TRANSFER FUNCTION AND COMPENSATION VALUES Desired OTA Gain at Cross−over Frequency fc (G) 10 desired_G fc_gain_db 20 Desired Phase Boost at Cross− over Frequency fc (boost) q margin * arg Hctrl_output (fc) 180 ° p * 90 ° p 180 ° Select OTA Compensation Zero to Coincide with Modulator Pole at fp1 (fz) w p1e 2 p Resulting OTA High Frequency Pole Placement (fp) fzfc ) fc 2 tan(boost) fc * fz tan(boost) Compensation Resistor (R2) fpG fp * fz V OUT 1.2 gm 1 ) fc fp 2 1 ) fz fp Compensation Capacitor (C1) 1 2 pf 2R2 Compensation Capacitor (C2) 1 2 pfp 1.2 gm V OUT OTA DC Gain (G0_OTA) V ref V OUT gmR0 Low Frequency Zero ( wz1e) 1 2 R 2 ) Resd R 2ResdC2 1 * 1 * 4 R 2ResdC2 R 2 ) Resd 2 C 1 High Frequency Zero ( wz2e) 1 2 R 2 ) Resd R 2ResdC2 1 ) 1 * 4 R 2ResdC2 R 2 ) Resd 2 C 1 Low Frequency Pole ( wp1e) 1 2 R 0 ) R2 ) Resd R 2 R0 ) Resd C2 1 * 1 * 4 R 2 R0 ) Resd C2 R 0 ) R2 ) Resd 2 C 1 High Frequency Pole ( wp2e) 1 2 R 0 ) R2 ) Resd R 2 R0 ) Resd C2 1 ) 1 * 4 R 2 R0 ) Resd C2 R 0 ) R2 ) Resd 2 C 1 OTA Transfer Function (GOTA(f)) −G 0_OTA 1 ) j 2 pf w z1e 1 ) j 2pf w p1e 1 ) j 2 pf w z2e 1 ) j 2pf w p2e The open−loop−response in closed−loop form to verify the gain/phase margins may be obtained from the following expressions. T(f) + G OTA(f)Hctrl_output(f) |
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