40V/100mA Adjustable output current，Low Power LED Driver IC DW8506
DW8506 General Description
The DW8506 is an instant LED driver for low power LED applications. At DW8506 output stage, one regulated current port is designed to provide a uniform and constant current sink for driving LEDs within a large range of VF variations.
DW8506 easily provides users a consistent current source. User may adjust the output current from up to 100mA through an externa resistor ,RS, which gives users flexibility in controlling the light intensity of LEDs. In addition, users can precisely.
DW8506 also guarantees that LEDs can be cascaded to maximum 40V at the output port.
DW8506 Features
● Constant output current invariant to supply and load voltage change
● 6.5V to 40V supply voltage
● Up to 100mA adjustable regulated output current
● Built-in thermal derating circuit
● Output current adjusted through an external resistor
● SOT-23-5L Package
DW8506 Applications
● LED light bulbs
● Signage and decorative LED lighting
● General lighting of flat panel displays
● RGB backlighting LED driver
● Current stabilizer with DC/DC or AC/DC
● General purpose constant current source
DW8506 Pin placement and IC dimension ：
Pin Description
PIN(DW8506)
| DW8506 Pin Name | DW8506 Description |
1
| N/C
| No connect
|
| 2 | GND
| Ground
|
| 3 | RS | Output current set input. Connect a resistor from RS to GND to set the LED bias current. |
| VDD
| Supply voltage input.
|
| 4 | IOUT
| Supply voltage input. Output pin. Sink current is decided by the current on RSET connected to RS.
|
DW8506 Block Diagram
DW8506 Typical Applications circuit
DW8506 vs BCR401W/420U
| DW8505A
| DW8506 | BCR401W | BCR420U | Remark |
Vender | DONGWOON
| DONGWOON | infineon | infineon | - |
Operating voltage | 5V~40V | 6.5V~40V | ~18V | ~40V | - |
PKG Size | SOT23-5L
(2.9mm X 2.8mm X 1.3mm)
| SOT23-5L
(2.9mm X 2.8mm X 1.3mm) | SOT343-4L (2.0mm X 2.1mm X 0.9mm) | SC74-6L
(2.9mm X 2.5mm X 1.1mm) | - |
PWM Dimming | O
(PWM input up to 20KHz)
| X | X | O
(PWM input up to 10KHz) | PWM input up to 20kHz frequency(DW8505A) |
Output Current | Up to 150mA Adjustable
| Up to 150mA
Adjustable | Up to 60mA
Adjustable | Up to 150mA
Adjustable | The Output current is Required set by considering The actual PKG’ surface temperature |
Temperature Protection | O
| O | X | X | LED module is required high Temperature protection |
Dropout Voltage | 0.1V@60mA
| 0.5V@50mA | 1.2V(Iout>8mA) | 1.4V (Iout>1.8mA) |
DW8505A(06) helps to install Many LED modules on a SMPS |
Variation by Temp. | Under ±1% (VEN 5V~40V) |
Under ±1% (VEN 5V~40V) | - | ±10%
(at 52mA) | Temperature -40℃~145℃ |
Iout Variation
At VEN Voltage | Under ±0.5% (VEN 5~40V) | - | - | 40mA~52mA
(VEN 5V~25V) |
Infinieon IC needs to select VEN Voltage |
Accuracy | ±3%(at 60mA)
| ±5% (at 60mA) | ±10%(at 20mA) | ±10% (at 10mA) | - |
Test DEMO Board
| DW8505A | DW8506 | BCR401W | BCR420U |
| EVB | 
| 
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| 
|
| RSET(20mA) | 36Kohm
| 6.04Kohm
| 80ohm
| 100ohm
|
DW8506 Output current characteristics by output voltage change
Test Condition：Vin12V, Iout 20mA Setting
| DW8505A
| DW8506
| BCR420U
| BCR401W
| Note. |
Dropout Voltage | 0.2V
| 0.3V
| 1V
| 1.2V
| Standard of VOUT 90%
|
DW8505A（DW8506）helps to install many LED modules on the same 12Vdc SMPS ( Because the dropout voltage of DW8505A, DW8506 are lower than BCR401W,BCR420U)
DW8506 IC Temperature characteristics by output voltage change ：
Test Condition : Vin12V, Iout 20mA Setting
IC temperature characteristics by Vout values( customer’s use of conditions : Vout Max. 9.4V )
| DW8505A
| DW8506
| BCR420U
| BCR401W
|
| IC Temp.(°C) | 53.7°C
| 54.3°C
| 58.4°C
| 51.2°C
|
DW8506 Output current characteristics by temperature change
Test Condition : Vin12V, Iout 20mA, Vout LED Vf Min.~Max. Setting. Temp. -45°C~145°C.
Current Accuracy：
LED Vf
| DW8505A
| DW8506
| BCR420U
| BCR401W
| Note. |
2.6V
| 4.53 ~ -5.84%
| -1.82 ~ 3.41%
| 10.64 ~ -20.39%
| 14.89 ~ -17.30%
| DW8505A/06 Thermal Derating O |
3.2V
| 4.42 ~ -5.70%
| -1.81 ~ 3.39%
| 10.56 ~ -20.42%
| 14.81 ~ -18.63%
|
As DW8505A, DW8506 operate the thermal derating protection at 125 °C, output current values reduce to ¼ .
As a result, It can drop IC’s heating level.
DW8505A/DW8506 have the deviation(variation) less than ±6%, While BCR401W/420U have the deviation(variation) less than ±20%.
DONGWOON Linear Solution ( Constant Current Regulator) ：
| DW8501
| DW8502
| DW8505A
| DW8506
| DW8506A
| DW3505A
|
Vin (min/max(V)) | 5V to 40V
| 5V to 40V
| 5V to 40V
| 6.5V to 40V
| 6.5V to 40V
| 5V to 40V
|
Output Current(mA) | Up to 1.5A adjustable
| Up to 2.5A adjustable
| Up to 100mA adjustable
| Up to 100mA adjustable
| Fixed 60mA
| Up to 300mA adjustable
|
Dropout Voltage
| Max.0.3V @ ILED=300mA
| Max. 1V @ ILED=1A
| Max. 0.1V @ ILED=60mA
| Max. 0.5V @ ILED=50mA
| Max. 0.6V @ ILED=60mA
| Max. 0.2V @ ILED=60mA
|
Dimming
| PWM
| PWM
| PWM
| -- | -- | PWM
|
Protection Function | Thermal derating
| Thermal derating
| Thermal derating
| Thermal derating
| Thermal derating
| Thermal derating
|
Package Options | SOT223-5L (6.5 x 3.5 x 1.8) TO252-5L (6.5 x 5.5 x 2.3) | TO263-5L (10.16x15.35x4.57) TO220-5L (10.1x28.85x4.57) | SOT23-5L (2.9 x 2.8 x 1.45) | SOT23-5L (2.92 x 2.8 x 1.3) | WLCSP (0.94 X 0.85 X 0.45) | SOT-89-5L (4.5 x 2.45 x 1.5) |
Typical application circuit | 
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