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LM5175-Q1 bảng dữ liệu(PDF) 3 Page - Texas Instruments

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tên linh kiện LM5175-Q1
Giải thích chi tiết về linh kiện  42 V Wide VIN Synchronous 4-Switch Buck-Boost Controller
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LM5175-Q1 bảng dữ liệu(HTML) 3 Page - Texas Instruments

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VIN
EN/UVLO
SLOPE
SS
COMP
FB
AGND
RT/SYNC
ISNS(+)
ISNS(±)
VOSNS
DITH
MODE
VISNS
2
1
7
8
9
11
10
6
14
13
12
5
4
3
28
27
26
25
24
23
22
21
20
19
18
16
15
17
SW1
HDRV1
BOOT1
LDRV1
BIAS
VCC
PGND
LDRV2
BOOT2
HDRV2
SW2
CS
CSG
PGOOD
LM5175-Q1
HTSSOP-28
3
LM5175-Q1
www.ti.com
SNVSAD9 – APRIL 2016
Product Folder Links: LM5175-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
6 Pin Configuration and Functions
HTSSOP-28
PWP Package
Top View
Pin Functions
PIN
DESCRIPTION
NO.
NAME
1
EN/UVLO
Enable pin. For EN/UVLO < 0.4 V, the LM5175-Q1 is in a low current shutdown mode. For 0.7 V < EN/UVLO <
1.23 V, the controller operates in standby mode in which the VCC regulator is enabled but the PWM controller is
not switching. For EN/UVLO > 1.23 V, the PWM function is enabled, provided VCC exceeds the VCC UV
threshold.
2
VIN
The input supply pin to the IC. Connect VIN to a supply voltage between 3.5 V and 42 V.
3
VISNS
VIN sense input. Connect to the input capacitor.
4
MODE
Mode = GND, DCM, Hiccup Disabled (Set RMODE resistor
to GND = 0
Ω)
Mode = 1.00 V, DCM, Hiccup Enabled (Set RMODE resistor
to GND = 49.9 k
Ω)
Mode = 1.85 V, CCM, Hiccup Enabled (Set RMODE resistor
to GND = 93.1 k
Ω)
Mode = VCC, CCM, Hiccup Disabled (Set RMODE resistor
to VCC = 0
Ω)
5
DITH
A capacitor connected between the DITH pin and AGND is charged and discharged with a 10 uA current source.
As the voltage on the DITH pin ramps up and down the oscillator frequency is modulated between –5% and +5%
of the nominal frequency set by the RT resistor. Grounding the DITH pin will disable the dithering feature. In the
external Sync mode, the DITH pin voltage is ignored.
6
RT/SYNC
Switching frequency programming pin. An external resistor is connected to the RT/SYNC pin and AGND to set
the switching frequency. This pin can also be used to synchronize the PWM controller to an external clock.
7
SLOPE
A capacitor connected between the SLOPE pin and AGND provides the slope compensation ramp for stable
current mode operation in both buck and boost mode.
8
SS
Soft-start programming pin. A capacitor between the SS pin and AGND pin programs soft-start time.
9
COMP
Output of the error amplifier. An external RC network connected between COMP and AGND compensates the
regulator feedback loop.
10
AGND
Analog ground of the IC.
11
FB
Feedback pin for output voltage regulation. Connect a resistor divider network from the output of the converter to
the FB pin.


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