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LM5176PWPR Datasheet(PDF) 14 Page - Texas Instruments

Part # LM5176PWPR
Description  LM5176 55-V Wide VIN Synchronous 4-switch Buck-boost Controller
PDF  45 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM5176PWPR Datasheet(HTML) 14 Page - Texas Instruments

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7.2 Functional Block Diagram
CS
+
-
CSG
CS AMPLIFIER
+
+
-
FB
COMP
SS
VREF
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
HICCUP CURRENT
LIMIT
MODE
ACS=5
AGND
PGND
EN/UVLO
VEN(OP)
+
-
ISNS(+)
ISNS(-)
45 mV
+
-
SS
CONSTANT
CURRENT LOOP
VIN
VCC
EN & BIAS
LOGIC
THERMAL
SHUTDOWN
CLK
BIAS
+
-
+
-
+
-
+
-
+
-
+
-
FB
1.1VREF
0.91VREF
VOVP
PGOOD
OV
1.2 V
1 mA/V
ISS
VEN(STBY)
+
-
OPERATING
STANDBY
¨,HYS(OP)
IEN(STBY)
1.6V
3.3V
7.3 Feature Description
7.3.1 Fixed Frequency Valley/Peak Current Mode Control with Slope Compensation
The LM5176 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.
The LM5176 regulates the output using valley current mode control in buck mode and peak current mode control
in boost mode. For valley current mode control, the high-side buck MOSFET controlled by HDRV1 is turned on
by the PWM comparator at the valley of the inductor ripple current and turned off by the oscillator clock signal.
Valley current mode control is advantageous for buck converters where the PWM controller must resolve very
short on-times. For peak current mode control in the boost mode, the low-side boost MOSFET controlled by
LM5176
SNVSAI1D – JUNE 2017 – REVISED AUGUST 2021
www.ti.com
14
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Product Folder Links: LM5176



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