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TPS2592ZL データシート(PDF) 11 Page - Texas Instruments

部品番号 TPS2592ZL
部品情報  4.5-V to 18-V eFuse with Blocking FET Control
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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TPS2592ZL データシート(HTML) 11 Page - Texas Instruments

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3,
4,
5
VIN
2
EN/
UVLO
+
1.4V
1.35V
4.3V
4.08V
+
UVLO
EN
TSD
220nA
70pF
6V
SWEN
4.8x
80W
10
ILIM
+
VIN
+
ILIMIT
1.6*ILIMIT
10 A
m
6V
GATE
CONTROL
Charge
Pump
Over
Voltage
Thermal
Shutdown
6,
7,
8
28mW
BFET
9
SWEN
22W
2 A
m
SWEN
Current
Sense
1
dV/dT
EP
GND
OUT
Fast Trip
Comp
Not Recommended for New Designs
TPS2592ZA, TPS2592ZL
www.ti.com
SLVSCU3 – DECEMBER 2014
9 Detailed Description
9.1 Overview
The TPS2592xx is an e-fuse with integrated power switch that is used to manage current/voltage/start-up voltage
ramp to a connected load. The device starts its operation by monitoring the VIN bus. When VIN exceeds the
undervoltage-lockout threshold (VUVR), the device samples the EN/UVLO pin. A high level on this pin enables the
internal MOSFET. As VIN rises, the internal MOSFET of the device will start conducting and allow current to flow
from VIN to OUT. When EN/UVLO is held low (below VENF), internal MOSFET is turned off. User also has the
ability to modify the output voltage ramp time by connecting a capacitor between dV/dT pin and GND.
After a successful start-up sequence, the device now actively monitors its load current, ensuring that the
adjustable overload current limit IOL is not exceeded. The device also has built-in thermal sensor. In the event
device temperature (TJ) exceeds TSHDN, typically 160°C, the thermal shutdown circuitry will shut down the
internal MOSFET thereby disconnecting the load from the supply. In TPS2592xL, the output will remain
disconnected (MOSFET open) until power to device is recycled or EN/UVLO is toggled (pulled low and then
high). The TPS2592xA device will remain off during a cooling period until device temperature falls below TSHDN
10°C, after which it will attempt to restart. This ON and OFF cycle will continue until fault is cleared.
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 GND
This is the most negative voltage in the circuit and is used as a reference for all voltage measurements unless
otherwise specified.
9.3.2 VIN
Input voltage to the TPS2592Zx. A ceramic bypass capacitor close to the device from VIN to GND is
recommended to alleviate bus transients. The recommended operating voltage range is 4.5 V to 18 V for
TPS2592Zx. The device can continuously sustain a voltage of 20 V on VIN pin. However, above the
recommended maximum bus voltage, the device will be in over-voltage protection (OVP) mode, limiting the
output voltage to VOVC. The power dissipation in OVP mode is PD_OVP = (VVIN - VOVC) x IOUT, which can
potentially heat up the device and cause thermal shutdown.
Copyright © 2014, Texas Instruments Incorporated
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