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BD18326NUF-M Datenblatt(PDF) 11 Page - Rohm |
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BD18326NUF-M Datenblatt(HTML) 11 Page - Rohm |
11 / 39 page 11/36 © 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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