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BD18326NUF-M Datenblatt(PDF) 11 Page - Rohm

Teilenummer BD18326NUF-M
Bauteilbeschribung  40 V 600 mA 1ch Constant Current Driver for Automotive LED Lamps
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD18326NUF-M Datenblatt(HTML) 11 Page - Rohm

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© 2020 ROHM Co., Ltd. All rights reserved.
BD18326NUF-M
28.Sep.2020 Rev.001
www.rohm.com
TSZ22111 • 15 • 001
TSZ02201-0T1T0B300340-1-2
Description of Blocks – continued
(Unless otherwise specified, Tj = 25 °C, VIN = 13 V)
8. Caution of Using LED Open Detection and Output Short Circuit Protection
8.1
Connection Method of LEDs to the OUT Pin
Protection functions could be enabled or disabled based on how LEDs are connected to the OUT pin.
Connection Method of LEDs
Connection Method
Output Short Circuit Protection
LED Open Detection
1 string in series
Detectable
Detectable
2 or more strings in parallel
Detectable
Not detectable(Note 1)
2 or more strings in parallel
(Matrix connection)
Detectable
Not detectable (Note 2)
(Note 1) Detectable only when 1 or more LEDs are open in all strings.
(Note 2) Detectable only when all LEDs from any string are open.
8.2
The Enable Zone of LED Open Detection and Output Short Circuit Protection, and Hi-Z Zone of the OUT
Pin
The enable zone of LED open detection and output short circuit protection is different between DC mode and
PWM dimming mode.
DC mode
: LED open detection and output short circuit protection are enable in all zone.
PWM dimming mode
: LED open detection is enable in only CRT ramp down zone.
Output short circuit protection is enable in all zone.
There is a zone which the OUT pin becomes Hi-Z at PWM dimming mode. During this time noise(Note 3) may
affect the decrease of the OUT pin voltage and cause malfunction of output short circuit protection. To prevent
this, consider measurements such as connecting a capacitor COUT(Note4) between the OUT pin and GND nearby
IC. (Recommended value by ROHM: COUT = 0.1 μF GCM188L81H104KA42 murata)
(Note 3) Conducted noise, Radiated noise, Crosstalk of wiring and connecter etc.
(Note 4) In case connecting a capacitor with 0.1 μF or more, do evaluation of a delay time from the power-on of VIN until output current IOUT flows
and pulse width of output current IOUT at PWM dimming mode. (Refer to example of evaluation: Description of Blocks 8.3)
[DC Mode]
[PWM Dimming Mode]
The Enable Zone of LED Open Detection, Output Short Circuit Protection,
and Hi-Z Zone of the OUT Pin
Capacitor Connected to the OUT Pin
OUT
OUT
OUT
・・・
・・・
1 string
in series
2 or more
strings in parallel
2 or more strings in parallel
Matrix connection
None
VCRT
VOUT
IOUT
OUT pin Hi-Z
Zone
LED Open
Detection
Output Short
Circuit Protection
0 V
0 V
0 m A
Hi-Z
0 m A
Enable
Hi-Z
Hi-Z
Enable
OUT pin Hi-Z
Zone
LED Open
Detection
Output Short
Circuit Protection
Enable
Enable
VCRT
VOUT
IOUT
Enable
Enable
BD18326NUF-M
OUT
COUT


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