TPS40140 datasheet(24/65 Pages) TI | DUAL OR 2-PHASE, STACKABLE CONTROLLER

Part #	TPS40140

Description	DUAL OR 2-PHASE, STACKABLE CONTROLLER

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5.24 CURRENT SENSING AND BALANCING

5.25 OVERCURRENT DETECTION AND HICCUP MODE

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

DUAL OR 2-PHASE, STACKABLE CONTROLLER

SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006

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, ICTLR.

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 sectionfor selecting the values of the RC network.

In order 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 re-start is attempted. If the fault has cleared, the re-start results in returning to

normal operation and regulation. This is shown in Figure 5-9.

Figure 5-9. Hiccup Mode and Recovery

APPLICATION INFORMATION

24

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