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TL499ACP Datasheet(PDF) 6 Page - Texas Instruments

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Part # TL499ACP
Description  Wide-Range Power-Supply Controllers
Download  19 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TL499ACP Datasheet(HTML) 6 Page - Texas Instruments

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Startup
GND
REF
SW REG
Control
Current Sense
Voltage
Sense
Startup
Blocking Diode
SW IN
SW REG IN2
SERIES IN1
OUTPUT
GND (PWR)
SW CURRENT CTRL
3
1
5
6
8
7
4
2
+
+
+
+
TL499A
SLVS029H – JANUARY 1984 – REVISED NOVEMBER 2015
www.ti.com
7 Detailed Description
7.1 Overview
The TL499A provides an adjustable output voltage between 2.9 V and 30 V. The primary power source uses the
internal linear regulator to provide the output voltage. When the primary power source is removed, the secondary
power source is stepped up using the internal switching regulator to provide the output voltage.
7.2 Functional Block Diagram
7.3 Feature Description
The TL499A has an adjustable output voltage set by feedback provided to REF pin abs an adjustable switching
current is set by value of resistor on SW CURRENT CONTROL pin. The lower resistance provides increased
switching current.
Dual power supply inputs also provide protection against power faults on the main supply of the TL499A.
7.4 Device Functional Modes
The TL499A has two functional modes:
Linear voltage regulation when SERIES IN1 supply is present.
Step-up voltage regulation when SERIES IN1 supply is absent.
6
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Copyright © 1984–2015, Texas Instruments Incorporated
Product Folder Links: TL499A


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