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TPS40322 Datasheet(PDF) 14 Page - Texas Instruments

Part No. TPS40322
Description  Dual Output or Two-Phase Synchronous Buck Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40322 Datasheet(HTML) 14 Page - Texas Instruments

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A
OUT
BIAS
R
V
0.6 V
1
R
RA
+
RBIAS
COMPx
UDG-11111
VREF
VOUTx
FBx
AGND
TPS40322
SLUSAF8E – JULY 2011 – REVISED JANUARY 2016
www.ti.com
7.3 Feature Description
7.3.1 Voltage Reference
The 600-mV band gap cell is internally connected to the non-inverting input of the error amplifier. The reference
voltage is trimmed with the error amplifier in a unity gain configuration to remove amplifier offset from the final
regulation voltage. The 0.5% tolerance on the reference voltage allows the user to design a very accurate power
supply.
7.3.2 Output Voltage Setting
The output voltages of the TPS40322 are set by using external feedback resistor dividers as shown in Figure 15.
The regulated output voltage (VOUT) is determined by Equation 1.
Figure 15. Setting the Output Voltage
(1)
7.3.3 Input Voltage Feedforward
The TPS40322 uses input voltage feedforward to maintain a constant power stage gain as the input voltage
varies and provides very good response to input voltage transient disturbances. The simple constant power
stage gain of the controller greatly simplifies feedback loop design because the loop characteristics remain
constant as the input voltage changes, unlike a typical buck converter without voltage feedforward. For modeling
purposes, the gain from the COMP pin to the average voltage at the input of the L-C filter is typically 8.5 V/V.
14
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Copyright © 2011–2016, Texas Instruments Incorporated
Product Folder Links: TPS40322


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