SP000665924 [INFINEON]
LED Driver,;
| 型号： | SP000665924 |
| 厂家： | 
Infineon |
| 描述： | LED Driver, 驱动 接口集成电路 |
| 文件： | 总26页 (文件大小：1346K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LED Driver
BCR420U / BCR421U
Datasheet
Revision 2.0, 2012-05-04
Power Management & Multimarket
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. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties
and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights
of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support
devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain
and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may
be endangered.
BCR420U / BCR421U
Revision History
Page or Item
Subjects (major changes since previous revision)
Revision 2.0, 2012-05-04
All
Datasheet layout updated
out limit increased
Rint limits tightened
out limits tightened
Table 2-1
Table 2-3
Table 2-3
Figure 3-13
Figure 3-22
V
I
Figure updated
8 Ω label updated
Trademarks of Infineon Technologies AG
AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™,
CORECONTROL™, CROSSAVE™, DAVE™, DI-POL™, EasyPIM™, EconoBRIDGE™, EconoDUAL™,
EconoPIM™, EconoPACK™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™,
ISOFACE™, IsoPACK™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OptiMOS™, ORIGA™,
POWERCODE™; PRIMARION™, PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™,
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Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™,
PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by AUTOSAR
development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum. COLOSSUS™,
FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG.
FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium. HYPERTERMINAL™ of
Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™ of Infrared Data
Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of
MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics
Corporation. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA
MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of
OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF
Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™
of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co.
TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™
of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas
Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes
Zetex Limited.
Last Trademarks Update 2011-11-11
Datasheet
3
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Table of Contents
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1
LED Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1
1.2
1.3
2
3
4
5
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Datasheet
4
Revision 2.0, 2012-05-04
BCR420U / BCR421U
List of Figures
List of Figures
Figure 1-1 Pin configuration and typical application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3-1 Total Power Dissipation Ptot = f(TS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3-2 Permissible Pulse Load RthJS = f(tp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3-3 Permissible Pulse Load Ptotmax / PtotDC= f(tp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 3-4 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = Parameter . . . . . . . . . . . . . 13
Figure 3-5 BCR420U: Output Current versus Rext Iout = f(Rext), VEN = 40 V, Vout = Parameter . . . . . . . . . . . . . 13
Figure 3-6 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = open, TA = Parameter . . . . 14
Figure 3-7 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = 20 Ω, TA = Parameter . . . . 14
Figure 3-8 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = 6 Ω, TA = Parameter . . . . . 15
Figure 3-9 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter . . . . . 15
Figure 3-10 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter . . . . . 16
Figure 3-11 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 6 Ω, TA = Parameter . . . . . . 16
Figure 3-12 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter . . . . . . . . . . . . . . 17
Figure 3-13 BCR420U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter . . . . . 17
Figure 3-14 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = Parameter . . . . . . . . . . . . 18
Figure 3-15 BCR421U: Output Current versus Rext Iout = f(Rext), VEN = 3.3 V, Vout = Parameter . . . . . . . . . . . . 18
Figure 3-16 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = open, TA = Parameter . . . 19
Figure 3-17 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 20 Ω, TA = Parameter. . . . 19
Figure 3-18 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 6 Ω, TA = Parameter. . . . . 20
Figure 3-19 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter . . . . . 20
Figure 3-20 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter . . . . . 21
Figure 3-21 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 6 Ω, TA = Parameter . . . . . . 21
Figure 3-22 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter . . . . . . . . . . . . . . 22
Figure 3-23 BCR421U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter . . . . . 22
Figure 4-1 Application Circuit: Enabling / PWM by Micro Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 4-2 Application Circuit: Enabling by Connecting to VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 5-1 Package Outline for SC74 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 5-2 Package Footprint for SC74 (dimensions in mm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 5-3 Tape and Reel Information for SC74 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Datasheet
5
Revision 2.0, 2012-05-04
BCR420U / BCR421U
List of Tables
List of Tables
Table 2-1 Maximum Ratings at TA = 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2-2 Thermal Resistance at TA = 25 °C, unless otherwise specified. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2-3 Electrical Characteristics at TA = 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2-4 DC Characteristics with stabilized LED load at TA = 25 °C, unless otherwise specified . . . . . . . . 10
Datasheet
6
Revision 2.0, 2012-05-04
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 -0.2 %/K reduces output current at higher temperatures
RoHS compliant (Pb-free) package
Automotive qualified according AEC Q101
SC74-3D
1.2
Applications
•
•
•
•
Architectural LED lighting
Channel letters for advertising, LED strips for decorative lighting
Retail lighting in fridge, freezer case and vending machines
Emergency lighting (e.g. steps lighting, exit way signs etc.)
1.3
General Description
The BCR420U / BCR421U provides a low-cost solution for driving 0.25 W LEDs with a typical LED current of
75 mA to 150 mA. Internal breakdown voltage is higher than 40 V which is the maximum voltage the LED driver
can sustain when the output is directly connected to supply voltage.
The BCR420U / BCR421U can be operated with a supply voltage of more than 40 V considering the voltage drop
of the LED load which reduces the output voltage to the maximum rating of the driver.
The enable pin of BCR420U can withstand a maximum voltage of 40 V which can be increased adding a series
resistor in front of the enable pin reducing the voltage at the enable pin below 40 V.
The digital input pin of BCR421U allows dimming via a micro controller with frequencies up to 10 kHz.
A reduction of the output current at higher temperatures is the result of the negative temperature coefficient of -
0.2 %/K of the LED driver.
With no need for additional external components like inductors, capacitors and free wheeling diodes, the
BCR420U / BCR421U LED drivers are a cost-efficient and PCB-area saving solution for driving 0.25 W LEDs.
Datasheet
7
Revision 2.0, 2012-05-04
BCR420U / BCR421U
LED Driver
Pin Configuration
Typical Application
+VS
EN
OUT
OUT
1
2
3
6
5
4
Rext
IEN
Iout
EN 1 OUT 2,3,5
OUT
GND
Rext
6
Rext
(optional )
Vdrop
GND
4
BCR420 U
Figure 1-1 Pin configuration and typical application
Type
Marking
40
Pin Configuration
2; 3; 5 = OUT 4 = GND
2; 3; 5 = OUT 4 = GND
Package
SC74
BCR420U
BCR421U
1 = EN
1 = EN
6 = Rext
6 = Rext
41
SC74
Datasheet
8
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Electrical Characteristics
2
Electrical Characteristics
Table 2-1 Maximum Ratings at TA = 25 °C, unless otherwise specified
Parameter
Symbol
Values
Unit Note / Test Condition
Min. Typ. Max.
Enable voltage
BCR420U
BCR421U
VEN
V
-
-
-
-
40
4.5
Output current
Iout
Vout
VR
-
-
-
-
-
-
-
200
40
mA
V
Output voltage
-
Reverse voltage between all terminals
Total power dissipation
Junction temperature
Storage temperature range
-
0.5
V
Ptot
TJ
-
1000 mW TS ≤ 100 °C
-
150
150
°C
°C
TSTG
-65
Attention: Stresses above the max. values listed here may cause permanent damage to the device.
Exposure to absolute maximum rating conditions for extended periods may affect device
reliability. Maximum ratings are absolute ratings; exceeding only one of these values may
cause irreversible damage to the integrated circuit.
Table 2-2 Thermal Resistance at TA = 25 °C, unless otherwise specified
Parameter
Symbol
Values
Unit Note / Test Condition
Min. Typ. Max.
Junction - soldering point1)
RthJS
-
-
50
K/W
1) For calculation of RthJA please refer to Application Note AN077 (Thermal Resistance Calculation)
Table 2-3 Electrical Characteristics at TA = 25 °C, unless otherwise specified
Parameter
Symbol
Values
Unit Note / Test Condition
Min.
Typ.
Max.
Collector-emitter breakdown voltage
VBR(CEO) 40
-
-
V
IC = 1 mA, IB = 0
Enable current
BCR420U
BCR421U
IEN
mA
-
-
1.2
1.2
-
-
V
V
EN = 24 V
EN = 3.3 V
DC current gain
Internal resistor
hFE
Rint
RB
200
350
95
500
105
-
IC = 50 mA, VCE = 1 V
IRint = 10 mA
85
Ω
kΩ
Bias resistor
BCR420U
BCR421U
-
-
20
1.5
-
-
Datasheet
9
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Electrical Characteristics
Table 2-3 Electrical Characteristics at TA = 25 °C, unless otherwise specified (cont’d)
Parameter
Symbol
Values
Typ.
Unit Note / Test Condition
Min.
Max.
Output current
BCR420U
BCR421U
Output current at Rext = 5.1 Ω
BCR420U
BCR421U
Iout
mA
V
V
V
V
V
V
out = 1.4 V
EN = 24 V
EN = 3.3 V
out > 2.0 V
EN = 24 V
EN = 3.3 V
9
9
10
10
11
11
-
-
150
150
-
-
Voltage drop (VRext
)
Vdrop
0.85
0.95
1.05
V
Iout = 10 mA
Table 2-4 DC Characteristics with stabilized LED load at TA = 25 °C, unless otherwise specified
Parameter
Symbol
Values
Typ.
Unit Note / Test Condition
Min.
Max.
Lowest sufficient supply voltage overhead VSmin
-
1.4
-
V
Iout > 18 mA
Output current change versusTA
BCR420U
BCR421U
∆Iout/Iout
%/K
V
V
V
out > 2.0 V
EN = 24 V
EN = 3.3 V
-
-
-0.2
-0.2
-
-
Output current change versus VS
BCR420U
BCR421U
∆Iout/Iout
%/V
V
V
V
out > 2.0 V
EN = 24 V
EN = 3.3 V
-
-
1
1
-
-
Datasheet
10
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
3
Typical characteristics
1200
1000
800
600
400
200
0
0
20
40
60
80
100
120
140
TS [°C]
Figure 3-1 Total Power Dissipation Ptot = f(TS)
100
10
1
D = 0
D = 0.005
D = 0.01
D = 0.02
D = 0.05
D = 0.1
D = 0.2
D = 0.5
0.1
10-6
10-5
10-4
10-3
10-2
10-1
100
tp [s]
Figure 3-2 Permissible Pulse Load RthJS = f(tp)
Datasheet
11
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
1000
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
10-6
10-5
10-4
10-3
10-2
10-1
100
tp [s]
Figure 3-3 Permissible Pulse Load Ptotmax / PtotDC= f(tp)
Datasheet
12
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.2
0.15
0.1
Rext = 6 Ω
Rext = 8 Ω
Rext = 10 Ω
Rext = 15 Ω
Rext = 30 Ω
0.05
0
Rext = open
0
1
2
3
4
5
6
7
8
9
10 11 12
Vout [V]
Figure 3-4 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = Parameter
0.2
0.15
0.1
0.05
Vout = 1.4 V
Vout = 5.4 V
0
1
10
100
Rext [Ω]
Figure 3-5 BCR420U: Output Current versus Rext Iout = f(Rext), VEN = 40 V, Vout = Parameter
Datasheet
13
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.015
0.01
0.005
0
-40 °C
25 °C
85 °C
0
2
4
6
8
10
12
Vout [V]
Figure 3-6 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = open, TA = Parameter
0.06
0.05
0.04
0.03
0.02
0.01
-40 °C
25 °C
85 °C
0
0
2
4
6
8
10
12
Vout [V]
Figure 3-7 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = 20 Ω, TA = Parameter
Datasheet
14
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.2
0.15
0.1
0.05
0
-40 °C
25 °C
85 °C
0
2
4
6
8
10
12
Vout [V]
Figure 3-8 BCR420U: Output Current versus Vout Iout = f(Vout), VEN = 40 V, Rext = 6 Ω, TA = Parameter
0.015
0.01
0.005
-40 °C
25 °C
85 °C
0
0
5
10
15
20
25
30
VEN [V]
Figure 3-9 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter
Datasheet
15
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.06
0.05
0.04
0.03
0.02
0.01
0
-40 °C
25 °C
85 °C
0
5
10
15
20
25
30
VEN [V]
Figure 3-10 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter
0.2
0.15
0.1
0.05
-40 °C
25 °C
85 °C
0
0
5
10
15
20
25
30
VEN [V]
Figure 3-11 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 6 Ω, TA = Parameter
Datasheet
16
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.15
0.1
0.05
0
Rext = open
Rext = 60 Ω
Rext = 30 Ω
Rext = 10 Ω
Rext = 8 Ω
Rext = 6 Ω
0
5
10
15
20
25
30
VEN [V]
Figure 3-12 BCR420U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter
3
2.5
2
1.5
1
0.5
-40 °C
25 °C
80 °C
0
0
5
10
15
20
25
30
35
40
VEN [V]
Figure 3-13 BCR420U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter
Datasheet
17
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.2
0.15
0.1
Rext = 6 Ω
Rext = 8 Ω
Rext = 10 Ω
Rext = 15 Ω
Rext = 30 Ω
0.05
0
Rext = open
0
1
2
3
4
5
6
7
8
9
10 11 12
Vout [V]
Figure 3-14 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = Parameter
0.2
0.15
0.1
0.05
Vout = 1.4 V
Vout = 5.4 V
0
1
10
100
Rext [Ω]
Figure 3-15 BCR421U: Output Current versus Rext Iout = f(Rext), VEN = 3.3 V, Vout = Parameter
Datasheet
18
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.015
0.01
0.005
0
-40 °C
25 °C
85 °C
0
2
4
6
8
10
12
Vout [V]
Figure 3-16 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = open, TA = Parameter
0.06
0.05
0.04
0.03
0.02
0.01
-40 °C
25 °C
85 °C
0
0
2
4
6
8
10
12
Vout [V]
Figure 3-17 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 20 Ω, TA = Parameter
Datasheet
19
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.2
0.15
0.1
0.05
0
-40 °C
25 °C
85 °C
0
2
4
6
8
10
12
Vout [V]
Figure 3-18 BCR421U: Output Current versus Vout Iout = f(Vout), VEN = 3.3 V, Rext = 6 Ω, TA = Parameter
0.015
0.01
0.005
-40 °C
25 °C
85 °C
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VEN [V]
Figure 3-19 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = open, TA = Parameter
Datasheet
20
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.06
0.05
0.04
0.03
0.02
0.01
0
-40 °C
25 °C
85 °C
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VEN [V]
Figure 3-20 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 20 Ω, TA = Parameter
0.2
0.15
0.1
0.05
-40 °C
25 °C
85 °C
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VEN [V]
Figure 3-21 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = 6 Ω, TA = Parameter
Datasheet
21
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Typical characteristics
0.15
0.1
0.05
0
Rext = open
Rext = 60 Ω
Rext = 30 Ω
Rext = 10 Ω
Rext = 8 Ω
Rext = 6 Ω
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VEN [V]
Figure 3-22 BCR421U: Output Current versus VEN Iout = f(VEN), Vout = 2 V, Rext = Parameter
3
2.5
2
1.5
1
0.5
-40 °C
25 °C
80 °C
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VEN [V]
Figure 3-23 BCR421U: Enable Current versus VEN IEN = f(VEN), Rext = open, Iout = 0 A, TA = Parameter
Datasheet
22
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Application hints
4
Application hints
+VS
µC
IEN
Iout
EN 1 OUT 2,3,5
Rext
6
Rext
(optional )
Vdrop
GND
4
BCR421 U
Figure 4-1 Application Circuit: Enabling / PWM by Micro Controller
+VS
IEN
Iout
EN 1 OUT 2,3,5
Rext
6
Rext
(optional )
Vdrop
GND
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. In stand alone application an
external resistor can be connected to adjust the current from 10 mA to 250 mA. Rext can be determined by using
Figure 3-5 or Figure 3-15. Connecting a low tolerance resistor Rext will improve the overall accuracy of the current
sense resistance formed by the parallel connection of Rint and Rext leading to an improved current accuracy. Please
take into account that the resulting output currents will be slightly lower due to the self heating of the component
and the negative thermal coefficient.
Please visit our web site www.infineon.com/lowcostleddriver for application notes and for up-to-date
application information.
Datasheet
23
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Package
5
Package
0.2
2.9
B
1.1 MAX.
(2.25)
+0.1
0.15
(0.35)
-0.06
6
1
5
2
4
3
+0.1
A
0.35
-0.05
M
0.2
B 6x
Pin 1
marking
0.1 MAX.
0.95
M
0.2
A
1.9
SC74-PO V04
Figure 5-1 Package Outline for SC74 (dimensions in mm)
0.5
0.95
SC74-FPR V04
Figure 5-2 Package Footprint for SC74 (dimensions in mm)
0.2
4
3.15
1.15
Pin 1
marking
SC74-TP
Figure 5-3 Tape and Reel Information for SC74 (dimensions in mm)
Datasheet
24
Revision 2.0, 2012-05-04
BCR420U / BCR421U
Terminology
Terminology
∆Iout/Iout
hFE
Output current change
DC current gain
IEN
Enable current
Iout
Output current
IR
Reverse current
LED
PCB
Ptot
Light Emitting Diode
Printed Circuit Board
Total power dissipation
Pulse Width Modulation
Bias resistor
PWM
RB
Rext
Rint
External resistor
Internal resistor
RoHs
RthJS
TA
Restriction of Hazardous Substance directive
Thermal resistance junction to soldering point
Ambient temperature
Junction temperature
Soldering point temperature
Storage temperature
Collector-emitter breakdown voltage
Breakdown voltage
TJ
TS
Tstg
VBR(CEO)
VBR
Vdrop
VEN
Vout
VR
Voltage drop
Enable voltage
Output voltage
Reverse voltage
VS
Supply voltage
VSmin
Lowest sufficient supply voltage overhead
Datasheet
25
Revision 2.0, 2012-05-04
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
相关型号：
SP000677896
Power Field-Effect Transistor, 64A I(D), 250V, 0.02ohm, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, TO-263AB, TO-263, 3/2 PIN
INFINEON
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