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LMZ22008 Arkusz danych(PDF) 3 Page - Texas Instruments

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Numer części LMZ22008
Szczegółowy opis  8A SIMPLE SWITCHER Power Module With 20-V Maximum Input Voltage and Current Sharing
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
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LMZ22008 Arkusz danych(HTML) 3 Page - Texas Instruments

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PGND/EP
Connect to AGND
5
AGND
6
AGND
3
SYNC
1
VIN
2
VIN
4
EN
7
FB
SS
9
SH
10
VOUT
11
VOUT
8
LMZ22008
www.ti.com
SNVS712H – FEBRUARY 2010 – REVISED AUGUST 2015
5 Pin Configuration and Functions
NDY Package
11-Pin
Top View
Pin Functions
PIN
TYPE
DESCRIPTION
NAME
NO.
5
Analog Ground — Reference point for all stated voltages. Must be externally connected to
AGND
Ground
PGND(EP).
6
Enable — Input to the precision enable comparator. Rising threshold is 1.274 V typical. Once the
EN
4
Analog
module is enabled, a 13-µA source current is internally activated to facilitate programmable
hysteresis.
Feedback — Internally connected to the regulation amplifier and overvoltage comparator. The
FB
7
Analog
regulation reference point is 0.795 V at this input pin. Connect the feedback resistor divider
between VOUT and AGND to set the output voltage.
Exposed Pad / Power Ground — Electrical path for the power circuits within the module. PGND is
not internally connected to AGND (pin 5,6). Must be electrically connected to pins 5 and 6 external
PGND
Ground
to the package. The exposed pad is also used to dissipate heat from the package during
operation. Use one hundred thermal vias from top to bottom copper for best thermal performance.
Share — Connect this pin to the share pin of other LMZ22008 modules to share the load between
the devices. One device should be configured as the master by connecting FB normally. All other
SH
9
Analog
devices should be configured as slaves by leaving their respective FB pins floating. Leave SH
floating if current sharing is not used. Do Not Ground. See Design Steps for the LMZ22008
Application section.
Soft-Start/Track Input — To extend the 1.6 ms internal soft-start connect an external soft-start
SS
8
Analog
capacitor. For tracking connect to an external resistive divider connected to a higher priority supply
rail. See Design Steps for the LMZ22008 Application section.
Synchronization — Apply a CMOS logic level square wave whose frequency is between 314 kHz
and 600 kHz to synchronize the PWM operating frequency to an external frequency source. When
SYNC
3
Analog
not using synchronization this pin must be tied to ground. The module free-running PWM
frequency is 359 kHz (typical).
1
Input supply — Nominal operating range is 6 V to 20 V. A small amount of internal capacitance is
VIN
Power
contained within the package assembly. Additional external input capacitance is required between
2
this pin and the exposed pad (PGND).
10
Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin
VOUT
Power
and exposed pad (PGND).
11
Copyright © 2010–2015, Texas Instruments Incorporated
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