TPS40140_16 datasheet(36/68 Pages) TI1 | Dual or 2-Phase, Stackable Controller

Part No.	TPS40140

Description	Dual or 2-Phase, Stackable Controller

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Manufacturer	TI1 [Texas Instruments]

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TRCKn

SW NODE

VOUT

COMP

ILIM

2.4 V

1.5 V

0.5 V

GND

VIN

GND

VOUT, REG

GND

t0

t1

t2

t3

(A)

(B)

(C)

(D)

TPS40140

SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015

www.ti.com

9.1.18 Current Sensing and Balancing

The controller employs peak current mode control scheme, thus naturally provides certain degree of current

balancing. With current mode, the level of current feedback should comply with certain guidelines depending on

duty factor known as “slope compensation” to avoid the sub-harmonic instability. This requirement can prohibit

achieving a higher degree of phase current balance. To avoid the controversy, a separate current loop that

forces phase currents to match is added to the proprietary control scheme. This effectively provides high degree

of current sharing independent of the controller’s small signal response and is implemented in U3 and U22 in the

Functional Block Diagram section.

High bandwidth current amplifiers, U2 and U21 can accept as an input voltage either the voltage drop across

dedicated precise current sense resistors, or inductor’s DCR voltage derived by an RC network, or thermally

compensated voltage derived from the inductor’s DCR. The wide range of current sense arrangements ease the

cost/complexity constrains and provides superior performance compared to controllers utilizing the low-side

MOSFET current sensing.

See the Inductor DCR Current Sense section for selecting the values of the RC network.

9.1.19 Overcurrent Detection and Hiccup Mode

To reduce the input current and component dissipation during on overcurrent event, a hiccup mode is

implemented. Hiccup mode refers to a sequence of 7 soft-start cycles where no MOSFET switching occurs and

then a restart is attempted. If the fault has cleared, the restart results in returning to normal operation and

regulation. This is shown in Figure 36.

Figure 36. Hiccup Mode and Recovery

36

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