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LM5035CSQ/NOPB 数据表(PDF) 18 Page - Texas Instruments

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部件名 LM5035CSQ/NOPB
功能描述  PWM Controller with Integrated Half-Bridge and SyncFET Drivers
PDF  35 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM5035CSQ/NOPB 数据表(HTML) 18 Page - Texas Instruments

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LM5035C
CS
LO
AGND
Power
Transformer
HO
Q2
Q1
R1
RF
CF
VPWR
VIN
Current
Sense
LM5035C
9V
VPWR
8.3V - 15V
(from aux winding)
VIN
VCC
LM5035C
VPWR
50
0.1 PF
VIN
LM5035C
SNVS631C – JANUARY 2010 – REVISED MARCH 2013
www.ti.com
Current Sense
The CS pin needs to receive an input signal representative of the transformer’s primary current, either from a
current sense transformer or from a resistor in series with the source of the LO switch, as shown in Figure 20
and Figure 21. In both cases, the sensed current creates a ramping voltage across R1, and the RF/CF filter
suppresses noise and transients. R1, RF and CF should be located as close to the LM5035C as possible, and the
ground connection from the current sense transformer, or R1, should be a dedicated track to the AGND pin. The
current sense components must provide greater than 0.25V at the CS pin when an over-current condition exists.
Figure 18. Input Transient Protection
Figure 19. Start-Up Regulator for VPWR >100V
Figure 20. Current Sense Using Current Sense Transformer
18
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Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LM5035C



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