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BD18340FV-M Fiches technique(PDF) 11 Page - Rohm |
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BD18340FV-M Fiches technique(HTML) 11 Page - Rohm |
11 / 39 page Datasheet Datasheet 11/35 BD18340FV-M BD18341FV-M ©2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp TSZ22111・14・001 TSZ02201-0T1T0C700180-1-2 2016.04.21 Rev.002 Features Description (Unless otherwise specified, Ta=25°C, VIN=13V, Transistor PNP = 2SAR573D, and numbers are “Typical” values.) 1. LED Current Setting LED current ILED can be defined by setting resistances RFB1 and RFB2. where: VFBREG is the FB Terminal Voltage 650mV (Typ) ・How to connect LED current setting resistors LED current setting resistors must always be connected at least in pair arranged in series as below. If only one current setting resistor is used, then in case of a possible resistor short, the external PNP Tr. and LED may be broken due to large current flow. PNP Tr. rating current, LED rating current, RFB1 and RFB2 must have the following relations: _ _ , where: ILED_Max is the LED Rating Current IPNP_Maxis the PNP Tr. Rating Current VFBREGis the FB Terminal Voltage 650mV(Typ) MinRFB1,RFB2 is the Lowest value of RFB1 and RFB2 BASE FB VREF GND VREG VIN EN +B RFB2 RFB1 VREG CVREG ILED VCE(SAT) Figure 13. LED Current Setting ・ Constant current control dynamic range Constant current control dynamic range of LED current ILED can be calculated as follows. _ ∙ _ where: VIN is the VIN Terminal Voltage Vf_LED is the LED Vf N is the Number of Rows of LED VCE sat is the External PNP Tr. Collector-Emitter Saturation Voltage VFBREG is the FB Terminal Voltage 650mV(Typ) 2. Reference-Voltage (VREG) VIN terminal generates 5.0V (Typ). This voltage is used as power source for the internal circuit, and also used to fix the voltage of terminals outside LSI to HIGH side. VREG terminal must be connected with CVREG = 1.0μF to 4.7μF to ensure capacity for the phase compensation. If CVREG is not connected, the circuit behavior would become extraordinarily unstable, for example with the oscillation of the reference-voltage. VREG terminal voltage must not be used as power source for other devices than this LSI. VREG circuit has a built-in UVLO function. The IC is activated when the VREG terminal voltage rises to 4.0V (Typ) or higher, and shut down when the VREG terminal voltage drops to 3.75V(Typ) or lower. |
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