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LM5175PWPR Datasheet(PDF) 13 Page - Texas Instruments

Part # LM5175PWPR
Description  LM5175 42-V Wide VIN Synchronous 4-Switch Buck-Boost Controller
PDF  43 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM5175PWPR Datasheet(HTML) 13 Page - Texas Instruments

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CS
+
-
CSG
CS
AMPLIFIER
+
+
-
FB
COMP
SS
0.8 V
GM ERROR
AMPLIFIER
VISNS
VOSNS
SLOPE
SLOPE
COMP
BUCK-BOOST CONTROLLER
LOGIC
VILIM
RT/SYNC
DITH
OSC/SYNC
CLK
ILIMIT
COMPARATOR
PWM
COMPARATOR
VCC
VCC
BOOT1
HDRV1
SW1
LDRV1
BOOT2
HDRV2
SW2
LDRV2
CCM/DCM
&
HICCUP CURRENT
LIMIT
MODE
A=5
AGND
PGND
EN/UVLO
1.23 V
+
-
ISNS(+)
ISNS(-)
45 mV
+
-
SS
CONSTANT
CURRENT LOOP
VIN
VCC
EN & BIAS
LOGIC
THERMAL
SHUTDOWN
CLK
BIAS
+
-
+
-
+
-
+
-
+
-
+
-
FB
0.88 V
0.72 V
0.86 V
PGOOD
OV
1.2 V
1 mA/V
5 µA
0.7 V
+
-
OPERATING
STANDBY
3.5 µA
1.5 µA
1.6 V
3.3 V
Copyright © 2016, Texas Instruments Incorporated
13
LM5175
www.ti.com
SNVSA37A – OCTOBER 2015 – REVISED MAY 2016
Product Folder Links: LM5175
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Fixed Frequency Valley/Peak Current Mode Control with Slope Compensation
The LM5175 implements a fixed frequency current mode control of both the buck and boost switches. The output
voltage, scaled down by the feedback resistor divider, appears at the FB pin and is compared to the internal
reference (VREF) by an internal error amplifier. The error amplifier produces an error voltage by driving the COMP
pin. An adaptive slope compensation signal based on VIN, VOUT, and the capacitor at the SLOPE pin is added to
the current sense signal measured across the CS and CSG pins. The result is compared to the COMP error
voltage by the PWM comparator.



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