STLED25JR STMicroelectronics, STLED25JR Datasheet - Page 19

• Manufacturer Part Number: STLED25JR
• Description: LED Lighting Drivers 5-Ch LED Step Up WH LED 2.3V to 5.5V
• Manufacturer: STMicroelectronics

Specifications of STLED25JR

• Product Category: LED Lighting Drivers
• Rohs: yes

STLED25
6.5
6.6
6.7
6.8
6.9
Undervoltage lockout
The undervoltage lockout function prevents improper operation of the STLED25 when the
input voltage is not high enough. When the input voltage is below the UVLO threshold, the
device is in shutdown mode. The hysteresis of 100 mV prevents unstable operation when
the input voltage is close to the UVLO threshold.
Overtemperature protection
An internal temperature sensor continuously monitors the IC junction temperature. If the IC
temperature exceeds 150 °C (typical), the device stops operating. As soon as the
temperature falls below 135 °C (typical), normal operation is restored.
Open LED protection
The device is able to detect an “Open LED” failure in each LED channel independently.
When this failure appears, the DC-DC increases the output voltage to maintain the current
source headroom voltage until the OVP threshold is reached; the device detects which LED
channel is the root cause and switches off this LED channel. This state is maintained until
the STLED25 goes into shutdown mode.
Overvoltage protection
The device has overvoltage protection on the V
components against the high voltage coming from the DC-DC, in case of a disconnected
load. When the output voltage level reaches the OVP threshold (9.3 V typical), the DC-DC is
turned off until the output voltage level goes below the OVP threshold. The hysteresis of the
OVP threshold is approximately 250 mV.
Short LED protection
The device is able to detect a shorted LED in each LED channel independently; when the
protection detects a failure on any of the LED channels, it switches off this channel until the
STLED25 enters shutdown mode.
Doc ID 022323 Rev 3
OUT
pin to protect the device and external
Detailed description
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