LTC3713EG#TR

更新时间： 2024-01-16 02:10:05

品牌	Logo	应用领域
凌特 - Linear		控制器
页数	文件大小	规格书
24页	317K
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数据手册

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LTC3713EG#TR 数据手册

LTC3713

PI FU CTIO S

RUN/SS (Pin 1): Run Control and Soft-Start Input. A

capacitor to ground at this pin sets the ramp time to full

output current (approximately 3s/µF) and the time delay

for overcurrent latchoff (see Applications Information).

Forcing this pin below 0.8V shuts down the device.

V_FB2(Pin 12): Boost Converter Feedback. The V_FB2pin is

connected to INTV_CCthrough a resistor divider to set the

voltage on INTV_CC. Set INTV_CCvoltage according to:

V_INTVCC= 1.23V(1 + R_F4/R_F3)

SW2 (Pin 13): Boost Converter Switch Pin. Connect

inductor/diode for boost converter portion here. Minimize

trace area at this pin to keep EMI down.

_ON(Pin 2): On-Time Voltage Input. Voltage trip point for

the on-time comparator. Tying this pin to the output

voltage makes the on-time proportional to V_OUT. The

comparatorinputdefaultsto0.7Vwhenthepinisgrounded,

2.4V when the pin is tied to INTV_CC.

PGND (Pins 14, 19): Power Ground. Connect these pins

closely to the source of the bottom N-channel MOSFET,

the (–) terminal of C_VCCand the (–) terminal of C_IN.

PGOOD (Pin 3): Power Good Output. Open-drain logic

output that is pulled to ground when the output voltage is

not within ±7.5% of the regulation point.

V_IN2(Pin 15): Input Supply Pin for Boost Converter

Portion of LTC3713. Must be locally bypassed.

V_IN1(Pin 16): Main Input Supply. Decouple this pin to

PGND with an RC filter (1Ω, 0.1µF).

V_RNG(Pin 4): Sense Voltage Range Input. The voltage at

this pin is ten times the nominal sense voltage at maxi-

mum output current and can be set from 0.5V to 2V by a

resistive divider from INTV_CC. The nominal sense voltage

defaults to 70mV when this pin is tied to ground, 140mV

when tied to INTV_CC.

INTV_CC(Pin17):InternalRegulatorOutput.Thedriverand

control circuits are powered from this voltage. Decouple

thispintopowergroundwithaminimumof4.7µFlowESR

tantalum or ceramic capacitor.

FCB (Pin 5): Forced Continuous Input. Tie this pin to

ground to force continuous synchronous operation at low

load, to INTV_CCto enable discontinuous mode operation

atlowloadortoaresistivedividerfromasecondaryoutput

when using a secondary winding.

BG (Pin 18): Bottom Gate Drive. Drives the gate of the

bottom N-channel MOSFET between ground and INTV_CC.

SENSE^–(Pin 20): Negative Current Sense Comparator

Input. The (–) input to the current comparator is normally

connected to power ground unless using a resistive di-

vider from INTV_CC(see Applications Information).

SENSE⁺(Pin 21): Positive Current Sense Comparator

Input. The (+) input to the current comparator is normally

connected to the SW1 node unless using a sense resistor

(see Applications Information).

I_TH(Pin 6): Current Control Threshold and Error Amplifier

Compensation Point. The current comparator threshold

increases with this control voltage. The voltage ranges

from 0V to 2.4V with 0.8V corresponding to zero sense

voltage (zero current).

SGND (Pins 7, 11): Signal Ground. All small-signal com-

ponentsandcompensationcomponentsshouldconnectto

this ground, which in turn connects to PGND at one point.

SW1 (Pin 22): Switch Node. The (–) terminal of the

bootstrap capacitor C_Bconnects here. This pin swings

from a diode voltage drop below ground up to V_IN.

I_ON(Pin 8): On-Time Current Input. Tie a resistor from V_IN

tothispintosettheone-shottimercurrentandtherebyset

the switching frequency.

TG (Pin 23): Top Gate Drive. Drives the top N-channel

MOSFET with a voltage swing equal to INTV_CCsuperim-

posed on the switch node voltage SW1.

V_FB1(Pin 9): Error Amplifier Feedback Input. This pin

BOOST (Pin 24): Boosted Floating Driver Supply. The (+)

terminal of the bootstrap capacitor C_Bconnects here. This

pin swings from a diode voltage drop below INTV_CCup to

V_IN+ INTV_CC.

connects the error amplifier input to an external resistive

divider from V_OUT

SHDN (Pin 10): Shutdown, Active Low. Tie to 1V or more

to enable boost converter portion of the LTC3713. Ground

to shut down.

3713fa

1...4 5 678 9 10...24

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