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TL2575HV-ADJ 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 TL2575HV-ADJ
상세설명  1-A Simple Step-Down Switching Voltage Regulators
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Internal
Regulator
On/Off
_
+
_
+
1.23-V
Band-Gap
Reference
52-kHz
Oscillator
Reset
Thermal
Shutdown
Current
Limit
FEEDBACK
4
CIN
+
VIN
1
Unregulated
DC Input
GND
3
OUTPUT
2
ON/OFF
5
COUT
+
D1
L
O
A
D
VOUT
1-A
Switch
Driver
Fixed-Gain
Error Amplifier
Comparator
R2
R1
1 k
3.3 V: R2 = 1.7 k
5 V: R2 = 3.1 k
12 V: R2 = 8.84 k
15 V: R2 = 11.3 k
ADJ: R1 = Open, R2 = 0
L1
TL2575, TL2575HV
www.ti.com
SLVS638C – JANUARY 2006 – REVISED NOVEMBER 2014
9 Detailed Description
9.1 Overview
The TL2575 and TL2575HV devices greatly simplify the design of switching power supplies by conveniently
providing all the active functions needed for a step-down (buck) switching regulator in an integrated circuit.
Accepting a wide input-voltage range of up to 60 V (TL2575-HV) and available in fixed output voltages of 3.3 V, 5
V, 12 V, 15 V, or an adjustable-output version, the TL2575 and TL2575HV devices have an integrated switch
capable of delivering 1 A of load current, with excellent line and load regulation. The device also offers internal
frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In
addition, a manual shutdown is available via an external ON/OFF pin.
The TL2575 and TL2575HV devices represent superior alternatives to popular three-terminal linear regulators.
Due to their high efficiency, the devices significantly reduce the size of the heatsink and, in many cases, no
heatsink is required. Optimized for use with standard series of inductors available from several different
manufacturers, the TL2575 and TL2575HV greatly simplify the design of switch-mode power supplies by
requiring a minimal addition of only four to six external components for operation.
The TL2575 and TL2575HV devices are characterized for operation over the virtual junction temperature range
of –40°C to 125°C.
9.2 Functional Block Diagram
Pin numbers are for the KTT (TO-263) package.
Copyright © 2006–2014, Texas Instruments Incorporated
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Product Folder Links: TL2575 TL2575HV


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