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UC1847L883B датащи(PDF) 11 Page - Texas Instruments

номер детали UC1847L883B
подробное описание детали  Current Mode PWM Controller
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1847L883B датащи(HTML) 11 Page - Texas Instruments

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VREF
RT
CT
+E/A
-E/A
COMP
SH-DN
GND
VIN
VC
AOUT
C/S+
BOUT
C/S-
CS/SS
UCX846
VIN
100µF
2
9
8
5
6
7
16
12
1
3
14
4
11
13
15
.1µ
F
.005µF
.5k
3.2k
3.2k
68k
.0015
3.6k
1k
1.5k
VREF
2N4150
180Ÿ
2W
.05µF
68Ÿ
.05µF
68Ÿ
1k
1k
2N4150
.5Q
1N4245
1N4245
1N4245
UES1402
UES1402
200µH
300µF
VO
UC1846, UC1847, UC2846
UC2847, UC3846, UC3847
www.ti.com
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The UCx846/7 family of control devices provides all of the necessary features to implement fixed frequency,
current mode control schemes while maintaining a minimum external parts count. The superior performance of
this technique can be measured in improved line regulation, enhanced load response characteristics, and a
simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting
capability, automatic symmetry correction for push-pull converters. Protection circuitry includes undervoltage
lockout and programmable current limit in addition to soft-start capability. A shutdown function is also available
which initiates either a complete shutdown with automatic restart or latch the supply off.
8.2 Typical Application
Figure 5. Typical Application Diagram
8.2.1 Design Requirements
Table 1 shows the design parameters for this application.
Table 1. Design Parameters
DESIGN PARAMETER
TARGET VALUE
Typical efficiency
85%
Switching frequency
880 kHz
Pulse by pulse current limit threshold
1 A
Copyright © 1997–2015, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847


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