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TPS40131RHBRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS40131RHBRG4 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 46 page  www.ti.com 13 20 6 7 U4 PWM LOGIC 16 BP8 AGND CS1 CSRT1 FB PWM1 5 mA TPS40131RHB 3 4 5 9 VOUT GSNS DIFFO VREF 10 11 23 8 +EA FB SS COMP 19 18 15 22 CS2 CSRT2 ILIM UVLO 14 17 2 EN/SYNC RT OVSET + + + U9 ICTLR U1 U7 U12 + U18 0.7 V Ramp1 U2 PWM2 U19 OC/UV Detect + U3 + U15 PGOOD VIN5 BP5 U23 Clock U22 Power-On Reset U25 OV Detect U24 Ramp Gen Ramp1 Ramp2 U20 SS UV OV OC 27 LDRV2 U21 U17 25 HDRV2 24 BOOT2 26 SW2 VIN5 29 LDRV1 30 VIN5 28 PGND U10 U5 Anti Cross Conduction 32 HDRV1 1 BOOT1 31 SW1 U6 U16 Anti Cross Conduction Ramp2 U14 20 kW 100 ns Delay BP8 20 kW 20 kW 20 kW 21 BP5 12 VDD LDO UDG-07021 FUNCTIONAL DESCRIPTION TPS40131 SLVS635 – FEBRUARY 2007 FUNCTIONAL BLOCK DIAGRAM The TPS40131 uses programmable fixed-frequency, peak current mode control with forced phase current balancing. Phase current is sensed by using either the DCR (direct current resistance) of the filter inductors or current sense resistors installed in series with output. The first method involves generation of a current signal with an R-C circuit (shown in the applications diagram). The R-C values are selected by matching time constants of the RC circuit and the inductor time constant, R ×C = L/DCR. With either current sense method, the current signal is amplified and superimposed on the amplified voltage error signal to provide current mode PWM control. Other features include: a true differential output sense amplifier, programmable current limit, programmable output over-voltage set-point, capacitor set soft-start, power good indicator, programmable input undervoltage lockout (UVLO), user programmable operation frequency for design flexibility, external synchronization capability, programmable pulse-by-pulse overcurrent protection, output undervoltage shutdown and restart. 9 Submit Documentation Feedback |
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