Datasheet

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Power Management & Multimarket

Datasheet

Revision 2.0, 2012-05-04

BCR420U / BCR421U

LED Driver

Summary of content (26 pages)

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LED Driver BCR420U / BCR421U Datasheet Revision 2.
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Edition 2012-05-04 Published by Infineon Technologies AG 81726 Munich, Germany © 2012 Infineon Technologies AG All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics.
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BCR420U / BCR421U Revision History Page or Item Subjects (major changes since previous revision) Revision 2.
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BCR420U / BCR421U Table of Contents Table of Contents Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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BCR420U / BCR421U List of Figures List of Figures Figure 1-1 Figure 3-1 Figure 3-2 Figure 3-3 Figure 3-4 Figure 3-5 Figure 3-6 Figure 3-7 Figure 3-8 Figure 3-9 Figure 3-10 Figure 3-11 Figure 3-12 Figure 3-13 Figure 3-14 Figure 3-15 Figure 3-16 Figure 3-17 Figure 3-18 Figure 3-19 Figure 3-20 Figure 3-21 Figure 3-22 Figure 3-23 Figure 4-1 Figure 4-2 Figure 5-1 Figure 5-2 Figure 5-3 Datasheet Pin configuration and typical application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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BCR420U / BCR421U List of Tables List of Tables Table 2-1 Table 2-2 Table 2-3 Table 2-4 Datasheet Maximum Ratings at TA = 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Thermal Resistance at TA = 25 °C, unless otherwise specified. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical Characteristics at TA = 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . .
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BCR420U / BCR421U LED Driver 1 LED Driver 1.1 Features • • • • • • • • • • LED drive current preset to 10 mA Continuous output current up to 150 mA with an external resistor Easy paralleling of drivers to increase current Supply voltage up to 40 V Low side current control Digital PWM input up to 10 kHz frequency (BCR421U) Up to 1 W power dissipation in a small SC74 package Negative thermal coefficient of -0.
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BCR420U / BCR421U LED Driver Pin Configuration Typical Application +VS EN 1 6 Rex t IEN EN OUT 2 5 OUT OUT 3 4 GND Iout 1 OUT 2,3,5 Rex t 6 GND Rex t (optional ) Vdrop 4 BCR420 U Figure 1-1 Pin configuration and typical application Type Marking BCR420U 40 1 = EN 2; 3; 5 = OUT 4 = GND 6 = Rext SC74 BCR421U 41 1 = EN 2; 3; 5 = OUT 4 = GND 6 = Rext SC74 Datasheet Pin Configuration 8 Package Revision 2.
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BCR420U / BCR421U Electrical Characteristics 2 Electrical Characteristics Table 2-1 Maximum Ratings at TA = 25 °C, unless otherwise specified Parameter Symbol Values Unit Min. Typ. Max. - - 40 4.5 Enable voltage BCR420U BCR421U VEN Output current Iout - - 200 mA Output voltage Vout - - 40 V Reverse voltage between all terminals VR - - 0.
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BCR420U / BCR421U Electrical Characteristics Table 2-3 Electrical Characteristics at TA = 25 °C, unless otherwise specified (cont’d) Parameter Symbol Output current BCR420U BCR421U Output current at Rext = 5.1 Ω BCR420U BCR421U Iout Voltage drop (VRext) Vdrop Table 2-4 Min. Typ. Max. 9 9 10 10 11 11 - 150 150 - 0.85 0.95 1.05 Unit Note / Test Condition mA Vout = 1.4 V VEN = 24 V VEN = 3.3 V Vout > 2.0 V VEN = 24 V VEN = 3.
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BCR420U / BCR421U Typical characteristics 3 Typical characteristics 1200 1000 Ptot [mW] 800 600 400 200 0 0 20 40 60 80 TS [°C] 100 120 140 Figure 3-1 Total Power Dissipation Ptot = f(TS) RthJS [K/W] 100 10 D=0 D = 0.005 D = 0.01 D = 0.02 D = 0.05 D = 0.1 D = 0.2 D = 0.5 1 0.1 -6 10 10 -5 10 -4 -3 10 tp [s] 10 -2 10 -1 0 10 Figure 3-2 Permissible Pulse Load RthJS = f(tp) Datasheet 11 Revision 2.
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BCR420U / BCR421U Typical characteristics Ptotmax / PtotDC 1000 D=0 D = 0.005 D = 0.01 D = 0.02 D = 0.05 D = 0.1 D = 0.2 D = 0.5 100 10 1 10-6 10-5 10-4 10-3 tp [s] 10-2 10-1 100 Figure 3-3 Permissible Pulse Load Ptotmax / PtotDC= f(tp) Datasheet 12 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.2 Rext = 6 Ω Iout [A] 0.15 Rext = 8 Ω Rext = 10 Ω 0.1 Rext = 15 Ω Rext = 30 Ω 0.05 Rext = open 0 0 1 2 3 4 5 6 7 Vout [V] 8 9 10 11 12 Figure 3-4 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = Parameter 0.2 Iout [A] 0.15 0.1 0.05 0 Vout = 1.4 V Vout = 5.4 V 1 10 Rext [Ω] 100 Figure 3-5 BCR420U: Output Current versus Rext Iout = f(Rext), VEN = 40 V, Vout = Parameter Datasheet 13 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.015 Iout [A] 0.01 0.005 0 -40 °C 25 °C 85 °C 0 2 4 6 Vout [V] 8 10 12 Figure 3-6 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = open, TA = Parameter 0.06 0.05 Iout [A] 0.04 0.03 0.02 0.01 0 -40 °C 25 °C 85 °C 0 2 4 6 Vout [V] 8 10 12 Figure 3-7 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = 20 Ω, TA = Parameter Datasheet 14 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.2 Iout [A] 0.15 0.1 0.05 0 -40 °C 25 °C 85 °C 0 2 4 6 Vout [V] 8 10 12 Figure 3-8 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = 6 Ω, TA = Parameter 0.015 Iout [A] 0.01 0.005 0 -40 °C 25 °C 85 °C 0 5 10 15 VEN [V] 20 25 30 Figure 3-9 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter Datasheet 15 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.06 0.05 Iout [A] 0.04 0.03 0.02 0.01 0 -40 °C 25 °C 85 °C 0 5 10 15 VEN [V] 20 25 30 Figure 3-10 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter 0.2 Iout [A] 0.15 0.1 0.05 0 -40 °C 25 °C 85 °C 0 5 10 15 VEN [V] 20 25 30 Figure 3-11 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 6 Ω, TA = Parameter Datasheet 16 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.15 Rext = open Rext = 60 Ω Rext = 30 Ω Rext = 10 Ω Rext = 8 Ω Rext = 6 Ω Iout [A] 0.1 0.05 0 0 5 10 15 VEN [V] 20 25 30 Figure 3-12 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter 3 2.5 IEN [mA] 2 1.5 1 0.5 0 -40 °C 25 °C 80 °C 0 5 10 15 20 VEN [V] 25 30 35 40 Figure 3-13 BCR420U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter Datasheet 17 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.2 Iout [A] 0.15 Rext = 6 Ω Rext = 8 Ω Rext = 10 Ω 0.1 Rext = 15 Ω Rext = 30 Ω 0.05 Rext = open 0 0 1 2 3 4 5 6 7 Vout [V] 8 9 10 11 12 Figure 3-14 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = Parameter 0.2 Iout [A] 0.15 0.1 0.05 0 Vout = 1.4 V Vout = 5.4 V 1 10 Rext [Ω] 100 Figure 3-15 BCR421U: Output Current versus Rext Iout = f(Rext), VEN = 3.3 V, Vout = Parameter Datasheet 18 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.015 Iout [A] 0.01 0.005 0 -40 °C 25 °C 85 °C 0 2 4 6 Vout [V] 8 10 12 Figure 3-16 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = open, TA = Parameter 0.06 0.05 Iout [A] 0.04 0.03 0.02 0.01 0 -40 °C 25 °C 85 °C 0 2 4 6 Vout [V] 8 10 12 Figure 3-17 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 20 Ω, TA = Parameter Datasheet 19 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.2 Iout [A] 0.15 0.1 0.05 0 -40 °C 25 °C 85 °C 0 2 4 6 Vout [V] 8 10 12 Figure 3-18 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 6 Ω, TA = Parameter 0.015 Iout [A] 0.01 0.005 0 -40 °C 25 °C 85 °C 0 0.5 1 1.5 2 2.5 3 VEN [V] 3.5 4 4.5 5 Figure 3-19 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter Datasheet 20 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.06 0.05 Iout [A] 0.04 0.03 0.02 0.01 0 -40 °C 25 °C 85 °C 0 0.5 1 1.5 2 2.5 VEN [V] 3 3.5 4 4.5 5 Figure 3-20 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter 0.2 Iout [A] 0.15 0.1 0.05 0 -40 °C 25 °C 85 °C 0 0.5 1 1.5 2 2.5 VEN [V] 3 3.5 4 4.5 5 Figure 3-21 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 6 Ω, TA = Parameter Datasheet 21 Revision 2.
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BCR420U / BCR421U Typical characteristics 0.15 Rext = open Rext = 60 Ω Rext = 30 Ω Rext = 10 Ω Rext = 8 Ω Rext = 6 Ω Iout [A] 0.1 0.05 0 0 0.5 1 1.5 2 2.5 VEN [V] 3 3.5 4 4.5 5 Figure 3-22 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter 3 2.5 IEN [mA] 2 1.5 1 0.5 0 -40 °C 25 °C 80 °C 0 0.5 1 1.5 2 2.5 VEN [V] 3 3.5 4 4.
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BCR420U / BCR421U Application hints 4 Application hints +V S µC IEN EN Iout 1 OUT 2,3,5 Rex t 6 GND Rex t (optional ) Vdrop 4 BCR421 U Figure 4-1 Application Circuit: Enabling / PWM by Micro Controller +V S EN IEN Iout 1 OUT 2,3,5 Rex t 6 GND Rex t (optional ) V drop 4 BCR420U Figure 4-2 Application Circuit: Enabling by Connecting to VS Application hints BCR420U / BCR421U serve as an easy to use constant current sources for LEDs.
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BCR420U / BCR421U Package Package 2.9 ±0.2 (2.25) B 1.1 MAX. 0.15 +0.1 -0.06 5 4 1 2 3 0.35 +0.1 -0.05 Pin 1 marking 0.2 1.6 ±0.1 6 2.5 ±0.1 (0.35) 0.25 ±0.1 5 A B 6x M 0.1 MAX. 0.95 0.2 1.9 M A SC74-PO V04 Figure 5-1 Package Outline for SC74 (dimensions in mm) 2.9 1.9 0.5 0.95 SC74-FPR V04 Figure 5-2 Package Footprint for SC74 (dimensions in mm) 0.2 2.7 8 4 Pin 1 marking 3.15 1.
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BCR420U / BCR421U Terminology Terminology ∆Iout/Iout Output current change hFE DC current gain IEN Enable current Iout Output current IR Reverse current LED Light Emitting Diode PCB Printed Circuit Board Ptot Total power dissipation PWM Pulse Width Modulation RB Bias resistor Rext External resistor Rint Internal resistor RoHs Restriction of Hazardous Substance directive RthJS Thermal resistance junction to soldering point TA Ambient temperature TJ Junction temperature TS S
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w w w . i n f i n e o n .