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PDF BCR420UW6Q Data sheet ( Hoja de datos )

Número de pieza BCR420UW6Q
Descripción LINEAR LED CONSTANT CURRENT REGULATOR
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BCR420UW6Q / BCR421UW6Q
LINEAR LED CONSTANT CURRENT REGULATOR IN SOT26
Description
These Linear LED drivers are designed to meet the stringent
requirements of automotive applications.
The BCR420U and BCR421U monolithically integrate transistors,
diodes and resistors to function as a Constant Current Regulator
(CCR) for linear LED driving. The device regulates with a preset
10mA nominal that can be adjusted with an external resistor up to
350mA. It is designed for driving LEDs in strings and will reduce
current at increasing temperatures to self-protect. Operating as a
series linear CCR for LED string current control, it can be used in
multiple applications, as long as the maximum supply voltage to the
device is < 40V.
With the low-side control, the BCR421U has an Enable (EN) pin
which can be pulse-width modulated (PWM) up to 25 kHz by a micro-
controller for LED dimming.
Features
LED Constant Current Regulator using NPN Emitter-Follower with
Emitter Resistor to Current Limit
IOUT 10mA ±10% Constant Current (Preset)
IOUT up to 350mA Adjustable with an External Resistor
VOUT 40V Supply Voltage
PD up to 1W in SOT26 (SC74R)
Low-Side Control Enabling PWM Input < 25kHz (BCR421U)
Negative Temperature Coefficient (NTC) Reduces IOUT with
Increasing Temperature
Parallel Devices to Increase Regulated Current
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q101 Standards for High Reliability
PPAP Capable (Note 4)
With no need for additional external components, this CCR is fully
integrated into an SOT26 minimizing PCB area and component count.
Applications
Constant Current Regulation (CCR) in:
Automotive Interior Lighting
Mood and Decorative Lighting
Mechanical Data
Case: SOT26 (SC74R)
Case Material: Molded Plastic. ―Green‖ Molding Compound.
UL Flammability Rating 94V-0
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish - Matte Tin Plated Leads.
Solderable per MIL-STD-202, Method 208
Weight: 0.018 grams (Approximate)
SOT26 (SC74R )
EN OUT
Top View
REXT
(Optional)
GND
Internal Device
Schematic
EN
OUT
OUT
REXT
OUT
GND
Top View
Pin-Out
Pin Name
OUT
EN
REXT
GND
Pin Function
Regulated Output Current
Enable for Biasing
Transistor
External Resistor for
Adjusting Output Current
Power Ground
Ordering Information (Note 5)
Product
BCR420UW6Q-7
BCR421UW6Q-7
Compliance
Automotive
Automotive
Marking
420
421
Reel Size (inches)
7
7
Tape Width (mm)
8
8
Quantity per Reel
3,000
3,000
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green‖ products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. Automotive products are AEC-Q101 qualified and are PPAP capable. Refer to http://www.diodes.com/product_compliance_definitions.html.
5. For packaging details, go to our website at http://www.diodes.com/products/packages.html.
BCR420UW6Q / BCR421UW6Q
Document number: DS38302 Rev. 2 - 2
1 of 13
www.diodes.com
May 2016
© Diodes Incorporated

1 page




BCR420UW6Q pdf
BCR420UW6Q / BCR421UW6Q
Typical Electrical Characteristics BCR421U (Cont.) (@TA = +25°C, unless otherwise specified.)
0.16
R =6
EXT
0.12
R =8
EXT
V =3.3V
EN
R =10
EXT
0.08
R =15
EXT
0.04
R = 30
EXT
R = open
EXT
0.00
0 1 2 3 4 5 6 7 8 9 10 11 12
V (V)
OUT
V vs I
OUT
OUT
0.16
0.14
0.12
0.10
-40oC
V =3.3V
EN
R =6
ext
25oC
85oC
0.08
0.06
0
0.02
0.01
2468
V (V)
OUT
V vs I
OUT
OUT
10 12
-40oC
V =3.3V
EN
R = open
EXT
25oC
85oC
0.20
0.15
V = 5.4V
OUT
0.10
V = 1.4V
OUT
0.05
0.00
1
V =3.3V
EN
10
R ()
ext
R () vs I
ext OUT
0.06
0.05
-40oC
100
0.04
0.03
25oC
85oC
V =3.3V
EN
R = 20
EXT
0.02
0 2 4 6 8 10 12
V (V)
OUT
V vs I
OUT
OUT
0.15
V =2V
OUT
0.10
R =10
EXT
R =6
EXT
R =8
EXT
R = 30
ext
0.05
R = 60
ext
R = open
ext
0.00 0.00
0 2 4 6 8 10 12
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V (V)
OUT
V vs I
OUT
OUT
V (V)
EN
V vs I
EN OUT
BCR420UW6Q / BCR421UW6Q
Document number: DS38302 Rev. 2 - 2
5 of 13
www.diodes.com
May 2016
© Diodes Incorporated

5 Page





BCR420UW6Q arduino
Application Information (Cont.)
Figure 5 Application Circuit for LED Driver
with Reverse Polarity Protection
BCR420UW6Q / BCR421UW6Q
To remove the potential of incorrect connection of the power supply
damaging the lamp’s LEDs, many systems use some form of
reverse polarity protection.
One solution for reverse input polarity protection is to simply use a
diode with a low VF in line with the driver/LED combination. The low
VF increases the available voltage to the LED stack and dissipates
less power. A circuit example is presented in Figure 5 which
protects the light engine although it will not function until the problem
is diagnosed and corrected. An SDM10U45LP (0.1A/45V) is shown,
providing exceptionally low VF for its package size of 1mm x 0.6mm.
Other reverse voltage ratings are available from Diodes
Incorporateds website such as the SBR02U100LP (0.2A/100V) or
SBR0220LP (0.2A/20V).
While automotive applications commonly use this method for
reverse battery protection, an alternative approach shown in Figure
6, provides reverse polarity protection and corrects the reversed
polarity, allowing the light engine to function.
The BAS40BRW incorporates four low VF Schottky diodes in a
single package, reducing the power dissipated and maximizes the
voltage across the LED stack.
Figure 7 shows an example configuration for 350mA operation. In
such higher current configurations adequate enable current is
provided by increasing the enable voltage.
Figure 6 Application Circuit for LED Driver with
Assured Operation Regardless Of Polarity
Figure 7 Example for 350mA Operation
BCR420UW6Q / BCR421UW6Q
Document number: DS38302 Rev. 2 - 2
11 of 13
www.diodes.com
May 2016
© Diodes Incorporated

11 Page







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