TPS54719_15 datasheet(17/40 Pages) TI

No de pièce	TPS54719

Description	TPS54719 2.95 V To 6 V Input, 7-A Synchronous Step Down SWIFT??Converter

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Fabricant	TI [Texas Instruments]

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0.89

Fsw(kHz)

24517 RT(k )-

=

´

W

1.121

SW

RT (k ) = 84145

F

(kHz)-

W

´

SS/TR1

TPS54719

EN1

PWRGD1

SS/TR2

TPS54719

EN2

PWRGD2

VOUT1

VOUT 2

R1

R2

EN1

Vout2

SS2

Vout1

TPS54719

www.ti.com

SLVSB69A – JUNE 2012 – REVISED JULY 2014

Feature Description (continued)

Figure 28. Schematic For Ratio-Metric Start-Up

Figure 29. Ratio-Metric Start-Up Using Coupled

Sequence

SS/TR Pins

7.4 Device Functional Modes

7.4.1 Constant Switching Frequency And Timing Resistor (RT Pin)

The switching frequency of the TPS54719 is adjustable over a wide range from 200 kHz to 2000 kHz by placing

a maximum of 218 k

Ω and minimum of 16.9 kΩ, respectively, on the RT pin. An internal amplifier holds this pin

at a fixed voltage when using an external resistor to ground to set the switching frequency. The RT is typically

0.5 V. To determine the timing resistance for a given switching frequency, use the curve in Figure 12, or

Equation 8.

spacer

(8)

spacer

(9)

To reduce the solution size one would typically set the switching frequency as high as possible, but tradeoffs of

the efficiency, maximum input voltage and minimum controllable on time should be considered.

The minimum controllable on time is typically 64 ns at full current load and 100 ns at no load, and limits the

maximum operating input voltage or output voltage.

7.4.2 Overcurrent Protection

The TPS54719 implements a cycle by cycle current limit. During each switching cycle the high side switch

current is compared to the voltage on the COMP pin. When the instantaneous switch current intersects the

COMP voltage, the high side switch is turned off. During overcurrent conditions that pull the output voltage low,

the error amplifier responds by driving the COMP pin high, increasing the switch current. The error amplifier

output is clamped internally. This clamp functions as a switch current limit.

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