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LM5575-Q1 bảng dữ liệu(PDF) 3 Page - Texas Instruments

tên linh kiện LM5575-Q1
Giải thích chi tiết về linh kiện  Simple Switcher 75-V, 1.5-A Step-Down Switching Regulator
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LM5575-Q1 bảng dữ liệu(HTML) 3 Page - Texas Instruments

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3
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VIN
PRE
FB
VCC
IS
AGND
OUT
RAMP
9
10
11
12
COMP
SD
BST
RT
13
14
15
16
SS
PGND
SYNC
SW
LM5575-Q1
www.ti.com
SNOSB23C – OCTOBER 2008 – REVISED DECEMBER 2014
6 Pin Configuration and Functions
PWP Package
16-Pin HTSSOP With Exposed Thermal Pad
Top View
Pin Functions
PIN
I/O
DESCRIPTION
APPLICATION INFORMATION
NAME
NO.
VCC
1
O
Output of the bias regulator
Vcc tracks Vin up to 9 V. Beyond 9 V, Vcc is regulated to 7 volts. A 0.1-
uF to 1-uF ceramic decoupling capacitor is required. An external
voltage (7.5 V – 14 V) can be applied to this pin to reduce internal
power dissipation.
SD
2
I
Shutdown or UVLO input
If the SD pin voltage is below 0.7 V the regulator will be in a low power
state. If the SD pin voltage is between 0.7 V and 1.225 V the regulator
will be in standby mode. If the SD pin voltage is above 1.225 V the
regulator will be operational. An external voltage divider can be used to
set a line undervoltage shutdown threshold. If the SD pin is left open
circuit, a 5µA pull-up current source configures the regulator fully
operational.
Vin
3
I
Input supply voltage
Nominal operating range: 6 V to 75 V
SYNC
4
I
Oscillator synchronization input or
The internal oscillator can be synchronized to an external clock with an
output
external pull-down device. Multiple LM5575-Q1 devices can be
synchronized together by connection of their SYNC pins.
COMP
5
O
Output of the internal error amplifier
The loop compensation network should be connected between this pin
and the FB pin.
FB
6
I
Feedback signal from the regulated
This pin is connected to the inverting input of the internal error amplifier.
output
The regulation threshold is 1.225 V.
RT
7
I
Internal oscillator frequency set
The internal oscillator is set with a single resistor, connected between
input
this pin and the AGND pin.
RAMP
8
O
Ramp control signal
An external capacitor connected between this pin and the AGND pin
sets the ramp slope used for current mode control. Recommended
capacitor range 50 pF to 2000 pF.
AGND
9
Ground Analog ground
Internal reference for the regulator control functions
SS
10
O
Soft-start
An external capacitor and an internal 10-µA current source set the time
constant for the rise of the error amp reference. The SS pin is held low
during standby, Vcc UVLO and thermal shutdown.
OUT
11
O
Output voltage connection
Connect directly to the regulated output voltage.
PGND
12
Ground Power ground
Low side reference for the PRE switch and the IS sense resistor.
IS
13
I
Current sense
Current measurement connection for the re-circulating diode. An
internal sense resistor and a sample/hold circuit sense the diode
current near the conclusion of the off-time. This current measurement
provides the DC level of the emulated current ramp.
Copyright © 2008–2014, Texas Instruments Incorporated
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