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| TPS40090PW Datasheet, PDF (2/31 Pages) Texas Instruments – HIGH-FREQUENCY, MULTIPHASE CONTROLLER | |||
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TPS40090
TPS40091
SLUS578B â OCTOBER 2003 â 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
TPS40090PW
2 CS2
CS3 3
4 CS4
CCS3
RCS3
CBP5
14 PGOOD
22 BP5
CSCN 5
6 ILIM
CS1 1
CCS1
R CS1
R ILIM2
R ILIM1
CREF
R FB3
17 GND
CSS
15 SS
RRT
R DROOP
16 RT
7 DROOP
8 REF
24 EN/SYNC
CFB1
9 COMP
VIN 23
PWM1 21
BP5
PWM2 20
PWM4 18
VIN (4.5 V to 15 V)
TI
Synchronous
Buck
Driver
R FB2
10 FB
R FB1
11 DIFFO
PWM3 19
TI
Synchronous
Buck
Driver
13 GNDS
12 VOUT
CIN
L1
L2
VOUT
(0.7 V to 3.5 V)
COUT
2
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Copyright © 2003â2006, Texas Instruments Incorporated
Product Folder Link(s): TPS40090 TPS40091
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