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LM5145 Datasheet(PDF) 24 Page - Texas Instruments

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Part # LM5145
Description  LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range
PDF  55 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM5145 Datasheet(HTML) 24 Page - Texas Instruments

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• IRDSON is the ILIM pin current in RDS-ON mode
• RS is the resistance of the current-sensing shunt element
• IRS is the ILIM pin current in RSENSE mode
Given the large voltage swings of ILIM in RDS(on) sensing mode, a capacitor designated CILIM connected from
ILIM to PGND is essential to the operation of the valley current limit circuit. Choose this capacitance such that
the time constant RILIM· CILIM is approximately 6 ns.
GND
LF
COUT
Q1
Q2
S
Q
Q
R
VIN
VOUT
Gate
Driver
RILIM
CILIM
S
Q
Q
R
PWML
ValleyPWM
ILIM
comparator
PWM
Latch
COMP
Clamp
Modulator
300 mV
IRAMP
VRAMP
+
CLK
PWM Comp
VCLAMP
PWM Aux
+
+
VREF
Error Amp
+
IRDSON(TJ)
PGND
ILIM
LO
HO
FB
COMP
+
±
SW
Figure 8-10. OCP Setpoint Defined by Current Source IRDSON and Resistor RILIM in RDS-ON Mode
Note that current sensing with a shunt component is typically implemented at lower output current levels
to provide accurate overcurrent protection. Burdened by the unavoidable efficiency penalty, PCB layout, and
additional cost implications, this configuration is not usually implemented in high-current applications (except
where OCP setpoint accuracy and stability over the operating temperature range are critical specifications).
LM5146
SNVSBV0A – JUNE 2021 – REVISED JUNE 2021
www.ti.com
24
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: LM5146



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