TPS40140RHHT datasheet(33/68 Pages) TI1

Part #	TPS40140RHHT

Description	Dual or 2-Phase, Stackable Controller

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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

−

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.

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