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TPS40140RHHRG4 Datasheet(PDF) 57 Page - Texas Instruments

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Part No. TPS40140RHHRG4
Description  Dual or 2-Phase, Stackable Controller
Download  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40140RHHRG4 Datasheet(HTML) 57 Page - Texas Instruments

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background image
L
NPH
1
2
3
4
J1
C1
47 mF
VIN
VINTP1
GNDTP3
Master
CLKIO
VIN
PHSELIN
COMP1
VSHR
GND
VOUT
Slave
CLKIO
VIN
GND
COMP1
VSHR
GND
VOUT
10 kW
VOUT
C2
180 mF
VOUTTP1
V
OUT
GND
GNDTP5
PHSELIN
NC
S1
R3
39 kW
GND
UDG-08085
TPS40140
www.ti.com
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
Figure 65. Motherboard Schematic
The design goal parameters are given in Table 8.
Table 8. Design Goal Parameters
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIN
Input Voltage
10.8
12
13.2
V
VOUT
Output voltage
1.8
V
VRIPPLE
Output ripple
IO = 20 A
20
mV
IPH
Phase current
5
A
fsw
Switching frequency
650
kHz
NPH
Phase number
4
9.3.1.1 Step 1: Output Capacitor Selection
The output capacitor is typically selected by the output load transient response requirement. Equation 23 in the
dual output design example is used. Also, as mentioned in the two phase design example, the inductor is
equivalent to
. Based on a 10-A load transient with a maximum of 30 mV deviation, a minimum 370-
μF
output capacitor is required. In the design, one 180
μF, 6.3 V, SP capacitor is placed on the mother board. Four
22-
μF, 6,3-V ceramic capacitors are placed on each module. The total output capacitance is 356 μF.
The output ripple current cancellation factor is calculated to be 0.526 with maximum input voltage based on
Equation 56.
So the maximum output ripple current is calculated by:
Copyright © 2005–2015, Texas Instruments Incorporated
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