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TPS40140RHHR Datasheet(PDF) 35 Page - Texas Instruments |
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TPS40140RHHR Datasheet(HTML) 35 Page - Texas Instruments |
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35 / 68 page  OUT SHR PEAK SNS IN ph V RAMP COMP RAMP V (I R ) 12.5 V 2N = ´ + + + ´ ´ OUT e SHR IN ph V RAMP V RAMP V V 2N = ´ + + 5 . 12 ) R I ( V COMP SNS PEAK e ´ ´ + = Error Amplifier PWM CSn Ramp U1 VSHARE CS gain = 12. 5 COMP CSRTn RSNS VOUT IOUT U2 U3 U4 U5 U6 20 µA U7 Overcurrent + + – + + + + R2 R1 ILIM VOUT 0.5 V 0 V + 1.8 V UDG-12122 Ve + VC – TPS40140 www.ti.com SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015 9.1.17 Current Sense Figure 35 shows the current sensing and overcurrent detection architecture. Figure 35. Output Current Sensing and Overcurrent Detection The output current, IOUT, flows through RSNS and develops a voltage, VC across it, representative of the output current. The voltage, VC, could also be derived from an R-C network in parallel with the output inductor. This voltage is amplified with a gain of 12.5 and then subtracted from the Error Amp output, COMP, to generate the Ve voltage. The Ve signal is compared to the slope-compensation RAMP signal to generate the PWM for the modulator. As the output current is increased, the amplified VC causes the Ve signal to decrease. In order to maintain the proper duty cycle (PWM), the COMP signal must increase. Therefore the magnitude of the COMP signal contains the output current information: (8) This is integral in the overcurrent detection as can be seen at comparator U7, comparing the ILIM voltage with COMP. In order to have the proper duty cycle at PWM, Ve is shown in Equation 9. where • Nph is 6 if PHSEL voltage = 1.6 ± 0.2 V, otherwise Nph is 8 (9) Combining equations: (10) Equation 10 shows the reason for resistors R1 and R2 being tied to VSHR and VOUT, respectively. Copyright © 2005–2015, Texas Instruments Incorporated Submit Documentation Feedback 35 Product Folder Links: TPS40140 |
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