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PDF TLF51801ELV Data sheet ( Hoja de datos )
| Número de pieza | TLF51801ELV | |
| Descripción | 10A synchronous DC/DC Step-Down Controller | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TLF51801ELV (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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TLF51801ELV
10 A synchronous DC/DC Step-Down Controller
Data sheet
Rev. 1.0.1, 2013-04-15
Automotive Power
1 page  
TLF51801ELV
Pin Configuration
Pin Symbol
11 UG
12 BTS
13 sense
low
14 sense
high
Exposed Pad
Function
Up-side MOSFET driver output
Driving output for the high-side external power MOSFET, connect to gate
Buck Driver Supply Input
Connect the bootstrap capacitor between this pin and pin BUO
Current sensing (low-side) input
For Shunt-configuration connect a shunt resistor from senselow to input/battery voltage, for
Rdson-configuration connect to source of the high-side MOSFET
Current sensing (high-side) input
Connect a resistor between battery and this pin to adjust the current threshold for both Rdson
and Shunt configurations
Connect to heatsink area and GND by low inductance wiring
Data sheet
5 Rev. 1.0.1, 2013-04-15
5 Page 
TLF51801ELV
Regulator
5.4 Bootstrap concept
The high-side MOSFET driver is supplied by the bootstrap concept. The capacitor at pin BTS and BUO must be
switched to GND to be charged by the internal LDO. A monitoring circuit controls the charge of the bootstrap
capacitor. If the charge is sufficient the driver will trigger the external high-side MOSFET. If a recharge is
necessary, the capacitor will be loaded using the integrated bootstrap diode by switching pin BUO to ground
forcing a proper PWM signal.
For very high duty-cycle and high input capacitance of the MOSFET, it may be necessary to consider use of an
external diode placed in parallel with the internal bootstrap diode to speed up the recharge of the bootstrap
capacitor. In addition, the small voltage drop across the external diode improves the overdrive of the gate of the
high-side MOSFET.
VS
Linear Regulator
EN
IVCC
Parts in grey are optional
Figure 7 Bootstrap concept
UV
PWM
CROSS
CONDUCTION
SAFETY LOGIC
LS
UG
DRIVER
PHS
DETECT
V_LS
LG
DRIVER
BTS
CBTS
UG
BUO
LG
PGND
Data sheet
11 Rev. 1.0.1, 2013-04-15
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet TLF51801ELV.PDF ] | |
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