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TPS40140 Datasheet(PDF) 33 Page - Texas Instruments

Part No. TPS40140
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

TPS40140 Datasheet(HTML) 33 Page - Texas Instruments

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R
BIAS + 0.7
R1
V
OUT * 0.7
COMP
+
RBIAS
0.7 V
VFB
VOUT
UDG-05100
R1
+
VOUT
GSNS
DIFFO
30 kW
30 kW
30 kW
30 kW
TPS40140
www.ti.com
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
9.1.9 Differential Amplifier, U9
The unity gain differential amplifier has high bandwidth to achieve improved regulation at user defined point of
load and ease layout constrains. The output voltage is sensed between the VOUT and GSNS pins. The output
voltage programming divider is connected to the output of the amplifier, the DIFFO pin.
Figure 32. Differential Amplifier Configuration
DESIGN HINT
Because of the resistor configuration of the differential amplifier, the input impedance must
be kept very low or errors result in setting the output voltage.
9.1.10 Setting the Output Voltage
Two resistors, R1 and RBIAS sets the output voltage as shown in Figure 33.
Figure 33. Setting the Output Voltage With RBIAS
RBIAS is calculated in Equation 6.
(6)
9.1.11 Programmable Input UVLO Protection
A voltage divider that sets 2 V on the UVLO_CEx pins determines when the controller begins to operate. The
internal regulators are enabled when the voltage on the UVLO_CEx pins exceeds 1 V, but switching commences
when the voltage is 2 V.
9.1.12 CLKFLT, CLKIO Pin Fault
If the CLKIO signal is to be distributed from the master to the slave controllers, and is not there, the slave
controller enters a ‘Standby’ mode. The upper and lower MOSFETs are turned off but the internal 5-V regulator
is still active and VREG is present. The CLKIO signal could be turned off at the master controller or the
connection to the slave CLKIO input could be opened. If the CLKIO signal is restored, normal operation
continues.
Copyright © 2005–2015, Texas Instruments Incorporated
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