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LM5575MH bảng dữ liệu(PDF) 3 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  SIMPLE SWITCHER 75V, 1.5A Step-Down Switching Regulator
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LM5575
www.ti.com
SNVS471G – JANUARY 2007 – REVISED APRIL 2013
PIN DESCRIPTIONS (continued)
Pin(s)
Name
Description
Application Information
15
PRE
Pre-charge assist for the bootstrap
This open drain output can be connected to SW pin to aid
capacitor
charging the bootstrap capacitor during very light load conditions
or in applications where the output may be pre-charged before
the LM5575 is enabled. An internal pre-charge MOSFET is
turned on for 250ns each cycle just prior to the on-time interval
of the buck switch.
16
BST
Boost input for bootstrap capacitor
An external capacitor is required between the BST and the SW
pins. A 0.022µF ceramic capacitor is recommended. The
capacitor is charged from Vcc via an internal diode during the
off-time of the buck switch.
NA
EP
Exposed Pad
Exposed metal pad on the underside of the device. It is
recommended to connect this pad to the PWB ground plane, in
order to aid in heat dissipation.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
(1) (2)
VIN to GND
76V
BST to GND
90V
PRE to GND
76V
SW to GND (Steady State)
-1.5V
BST to VCC
76V
SD, VCC to GND
14V
BST to SW
14V
OUT to GND
Limited to Vin
SYNC, SS, FB, RAMP to GND
7V
ESD Rating(3)
Human Body Model
2kV
Storage Temperature Range
-65°C to +150°C
(1)
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics.
(2)
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3)
The human body model is a 100pF capacitor discharged through a 1.5k
Ω resistor into each pin.
Operating Ratings
(1)
VIN
6V to 75V
Operation Junction Temperature
−40°C to + 125°C
(1)
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics.
Copyright © 2007–2013, Texas Instruments Incorporated
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