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TPS40140 Datasheet(PDF) 42 Page - Texas Instruments

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Part No. TPS40140
Description  DUAL OR 2-PHASE, STACKABLE CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS40140 Datasheet(HTML) 42 Page - Texas Instruments

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R1
L1
DCR
C1
To CSRTx
To CSx
R2
VOUT
VIN
+
VC
R1 ø R2 +
L1
DCR
C1
(19)
R2
R1 ) R2
(20)
6
DESIGN EXAMPLES
6.1 Example 1: Dual-Output Configuration from 12 V to 3.3 V and 1.5 V DC-to-DC Converter
6.1.1
Step 1: Inductor Selection
V
- V
V
1
IN(max)
OUT
OUT
L =
×
×
I
V
f
RIPPLE
IN(max)
SW
(1)
TPS40140
DUAL OR 2-PHASE, STACKABLE CONTROLLER
SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006
Figure 5-24. Using Resistor R2 to Reduce the Current Sense Amplifier Voltage
The parallel combination of R1 and R2 is shown in Equation 19.
The ratio shown in Equation 20 provides the required voltage attenuation.
Using a TPS40140
The following example illustrates the design process and component selection for a dual output
synchronous buck converter using TPS40140. The design goal parameters are given in Table 6-1. Only
the calculated numbers for the 1.5-V output are shown, however, the equations are suitable for both
channel design. A list of symbol definitions is found at the end of this section.
Table 6-1. Design Goal Parameters
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
VIN
Input voltage
10.8
12
13.2
V
VOUT1
Output voltage 1
1.5
V
VOUT2
Output voltage 2
3.3
V
VRIPPLE
Output ripple
IO = 20 A
2%Vo
V
IOUT1
Output current 1
20
A
IOUT2
Output current 2
20
A
fsw
Switching frequency
500
kHz
The inductor is determined by the desired ripple current. The required inductor is calculated by:
Typically the peak-to-peak inductor current, I
RIPPLE is selected to be around 20% of the rated output
current. In this design, I
RIPPLE is targeted at 15% of IOUT1. The calculated inductor is 0.89 µH and in
practical a 1-
µH, 32-A inductor from Vishay is selected. So, the inductor ripple current is 2.66 A.
DESIGN EXAMPLES
42
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