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TPS40090RHDT Datasheet(PDF) 2 Page - Texas Instruments |
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TPS40090RHDT Datasheet(HTML) 2 Page - Texas Instruments |
2 / 31 page COUT VIN (4.5Vto15V) CIN CCS3 CCS1 RDROOP VOUT (0.7Vto3.5V) RFB1 RFB2 RFB3 CFB1 RRT CSS RILIM2 CBP5 RCS1 RCS3 21 23 VIN PWM3 19 L2 L1 TI Synchronous Buck Driver PWM1 3 6 1 CS3 CS1 ILIM 17 RT 7 SS 15 GND 9 10 COMP 16 DROOP 4 2 CS4 CS2 FB 12 13 VOUT GNDS 11 DIFFO 8 REF 22 BP5 5 CSCN PGOOD 24 EN/SYNC PWM2 20 PWM4 18 14 TI Synchronous Buck Driver BP5 TPS40090PW RILIM1 CREF TPS40090 TPS40091 SLUS578B – OCTOBER 2003 – REVISED MAY 2006 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. DESCRIPTION CONTINUED The TPS4009x uses fixed frequency, peak current mode control with forced phase current balancing. When compared to voltage mode control, current mode results in a simplified feedback network and reduced input line sensitivity. Phase current is sensed by using either current sense resistors installed in series with output inductors or, for improved efficiency, by using the DCR (direct current resistance) of the filter inductors. The latter method involves generation of a current proportional signal with an R-C circuit (shown in Figure 10). The R-C values are selected by matching the time constants of the R-C circuit and the inductor; 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. An output voltage droop can be programmed to improve the transient window and reduce size of the output filter. Other features include a single voltage operation, a true differential sense amplifier, a programmable current limit, soft-start and a power good indicator. SIMPLIFIED TWO-PHASE APPLICATION DIAGRAM 2 Submit Documentation Feedback Copyright © 2003–2006, Texas Instruments Incorporated Product Folder Link(s): TPS40090 TPS40091 |
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