ST EVAL-RHRICL1AFV1, Руководство пользователя, Страница: 2 / 27

1 Description
The RHRPMICL1A is an integrated current limiter designed to work as a high-side gate driver or intelligent power
switch driver, with an external P-channel power MOSFET. It can be used as a universal solution to protect a
power supply (from 8.5 V) from anomalous external current demand (for example, even in case of a short-circuit
condition).
The device can operate with a supply voltage range from 8.5 V to 52 V. An undervoltage lockout circuitry
guarantees the appropriate power supply integrity.
As the device can operate in floating ground configuration, in this user manual GND, the ground pin of the
RHRPMICL1A device (pin 7), and MGND the ground of main bus are defined.
In case of overload, the device behavior changes according to its configured mode of operation:
•
Latched mode , the device provides current limitation capability for an external configurable time, called trip-
off time, and if the overcurrent condition exceeds this time, the device switches OFF. In this case, the device
may be switched ON again through the telecommand pin only or a UVLO deactivation/activation cycle
• Re-triggerable mode , after the trip-off time, that is externally configurable, the device switches OFF and
remains in this state for a recovery time that is externally configurable. Once this time elapses, the device
recovers its typical operation mode if the overload condition disappears, otherwise it switches cyclically ON
and OFF again while the overload persists (hic-up mode)
• Foldback mode , in case of overload, the device provides current limitation with a value decreasing in
tracking with the output voltage, reaching a fixed and safe value even if a short-circuit persists
The mode of operation can be selected by configuring the RHRPMICL1A pins according to the following
configuration table, which is implemented in the evaluation boards:
Table 2. Applicable tools
Mode SET_FLB SET_STS TC_ON TC_OFF TON TOFF
Status at
power-up
Latched OFF 0 0 Telecommand Telecommand
C
ON
GND (1) OFF
Latched ON 0 1 Telecommand Telecommand
C
ON
GND
(1)
ON
Re-triggerable 0 1 Vcc Vcc
C
ON
C
OFF
ON
Foldback 1 1 Vcc Vcc GND
(1)
GND
(1)
ON
1. GND refers to the RHRPMICL1A GND pin (pin 7), not to the main system ground (MGND).
The characteristics and the main functionalities of each demonstration board are described in the following
sections.
UM2605
Description
UM2605 - Rev 1
page 2/27