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Numéro de référence | ACS761ELF-20B | ||
Description | 12V High-Side Hot-Swap Hall Effect Based Current Monitor | ||
Fabricant | Allegro Micro Systems | ||
Logo | |||
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ACS761ELF-20B
12 V High-Side Hot-Swap Hall Effect Based Current Monitor
Features and Benefits
▪ Hall-effect current monitor—no external sense resistor required
▪ PGOOD and ¯P¯¯G¯¯¯O¯¯O¯¯¯D¯ indication
▪ Analog output voltage (factory trimmed for gain and offset)
proportional to applied current
▪ External high-side FET gate drive
▪ 240V*A power fault protection with user-selectable delay
▪ Overcurrent fault protection with user-selectable delay
▪ Fault protection isolates failed supply from output in < 2 μs
▪ 1.5 mΩ internal conductor resistance
▪ Active low latched Fault indicator output signal
▪ User controlled soft start / hot-swap function
▪ Logic enable input pin
▪ 10.8 to 13.2 V, single-supply operation
▪ 2 kV ESD protection for all pins
Package: 24 pin QSOP (suffix LF)
Description
The ACS761 combines Allegro® Hall-effect current sense
technology with a hot-swap controller resulting in a more
efficient integrated controller for 12 V applications. By
eliminating the need for a shunt resistor, the I2R losses in the
power path are reduced.
When the ACS761 is externally enabled, and the voltage rail is
above the internal UVLO threshold, the internal charge pump
drives the gate of the external FET. When the load voltage
reaches its target value PGOOD is asserted high. When a fault
is detected, the gate is disabled while simultaneously alerting
the application that a fault has occurred.
The integrated protection in the ACS761 incorporates three
levels of fault protection, which includes a Power Fault with
user-selectable delay, an Overcurrent Fault threshold with user-
selectable delay, and Short Circuit protection, which disables
the gate in less than 2 μs. These faults are indicated to the
host system via the Fault pin and are cleared upon reasserting
enable high.
Approximate Scale
Typical Application
Enable
1
2
IP 3
4
CIN RV1
5
6
REN
7
CEN
8
VOUT 9
10
CG
COCD
COPD
11
12
24
IP+ IP–
23
IP+ IP–
22
IP+ IP–
21
IP+
ACS761
IP–
20
IP+ IP–
19
IP+ IP–
18
EN GATE
17
VIOUT
GND
16
NC PGOOD
15
CG FB+
14
OCDLY
PGOOD
13
OPDLY
FAULT
S1 VLOAD
CLOAD
RG
RFB
3.3 V
100
kΩ
RS1
100 kΩ
RFAULT
100 kΩ
761ELF20B-DS, Rev. 2
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Pages | Pages 14 | ||
Télécharger | [ ACS761ELF-20B ] |
No | Description détaillée | Fabricant |
ACS761ELF-20B | 12V High-Side Hot-Swap Hall Effect Based Current Monitor | Allegro Micro Systems |
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