LTC1647-1IS8#TRPBF【PDF 8/22 页】IC CONTROLLR HOTSWAP DUAL 8-SOIC

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录41

4页 5页 6页 7页 [8页]9页 10页 11页 12页

LTC1647-1/

LTC1647-2/LTC1647-3

1647fa

PIN FUNCTIONS

CC1

(LTC1647-3): Channel 1 Positive Supply Input.

The supply range for normal operation is 2.7V to 16.5V .

The supply current, I

CC1

, is typically 1mA. Channel 1s

undervoltage lockout (UVLO) circuit disables GATE 1 until

the supply voltage at V

CC1

is greater than V

LKO

(typically

2.45V). GATE 1 is held at ground potential until UVLO

deactivates. If ON1 is high and V

CC1

is above the UVLO

threshold voltage, GATE 1 is pulled high by a 10糀 current

source. If V

CC1

falls below (V

LKO

LKH

), GATE 1 is pulled

immediately to ground. The internal reference and the

common charge pump are powered from the higher of

the two V

inputs, V

CC1

or V

CC2

(LTC1647-3): Channel 2 Positive Supply Input. See

CC1

for functional description.

: The Common Positive Supply Input for the LTC1647-1

and the LTC1647-2. V

CC1

and V

CC2

are internally connected

together.

GND: Chip Ground.

ON1: Channel 1 ON Input. The threshold at the ON1 pin is

set at 1.29V with 70mV hysteresis. If UVLO and the circuit

breaker of channel 1 are inactive, a logic high at ON1 enables

the 10糀 charge pump current source, pulling the GATE

1 pin above V

CC1

. If the ON1 pin is pulled low, the GATE 1

pin is pulled to ground by a 50糀 current sink.

ON1 resets channel 1s electronic circuit breaker by pulling

ON1 low for greater than one t

RESET

period (50約). A

low-to-high transition at ON1 restarts a normal GATE 1

pull-up sequence.

ON2: Channel 2 ON Input. See ON1 for functional

description.

FAULT1: Channel 1 Open-Drain Fault Status Output. FAULT1

pin pulls low after 0.3約 (t

FAULT

) if the circuit breaker

measures greater than 50mV across the sense resistor

connected between V

CC1

and SENSE 1. If FAULT1 pulls

low, GATE 1 also pulls low. FAULT1 remains low until ON1

is pulled low for at least one t

RESET

period.

FAULT2: Channel 2 Open-Drain Fault Status Output. See

FAULT 1 for functional description.

SENSE1: Channel 1 Circuit Breaker Current Sense Input.

Load current is monitored by a sense resistor connected

between V

CC1

and SENSE 1. The circuit breaker trips if the

voltage across the sense resistor exceeds 50mV (V

). To

disable the circuit breaker, connect SENSE 1 to V

CC1

. In

order to obtain optimum performance, use Kelvin-sense

connections between the V

and SENSE pins to the

current sense resistor.

SENSE2: Channel 2 Circuit Breaker Current Sense Input.

See SENSE 1 for functional description.

GATE1: Channel 1 N-channel MOSFET Gate Drive Output.

An internal charge pump guarantees at least 10V of gate

drive from a 5V supply. Two Zener clamps are incorporated

at the GATE 1 pin; one Zener clamps GATE 1 approximately

15V above V

and the second Zener clamps GATE 1

appoximately 28V above GND. The rise time at GATE 1 is

set by an external capacitor connected between GATE 1

and GND and an internal 10糀 current source provided

by the charge pump. The fall time at GATE 1 is set by

the 50糀 current sink if ON1 is pulled low. If the circuit

breaker is tripped or the supply voltage hits the UVLO

threshold, a 50mA current sink rapidly pulls GATE 1 low.

An external 23V Zener from GATE1 to GND is required for

supply voltages (V

CC1

) greater than 10V.

GATE2: Channel 2 N-channel MOSFET Gate Drive Output.

See GATE 1 for functional description.

NC: No Connection.

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式