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DongWoon Primary Agent DC to DC linear constant current drive IC DW3505A

Model：: DW3505A

Brand：: DongWoon

Batch No：: DW3505A,BCR320U,BCR420U

Desc：: Low Power linear LED Driver IC

Stock：: 0 只

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Topological :	DC/DC線性恒流IC
Package :	SOT89-5
Max. power output :	39V@300mA
LED serial number :	Vou=Vin-0.3V
Input voltage :	5~40V
Output voltage :	Vou=Vin-0.3V
Max. Output Current :	300mA
Efficiency :	93%
Dimming mode :	PWM調光
Current accuracy :	5%
Typical applications :	LED臺燈，LED工礦燈
Replacement models :	AMC7135,QX7135
Application description :	輸入電壓與LED串聯(lián)總Vf電壓相近，效率可達97%以上，壓差越大則功耗溫升越大
Keywords :	DW3505,Dw3505A,SOT89線性恒流IC，SOT89 LDO,AMC7135,QX7135

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DONGWOON DW3505A Low Dropout Linear LED Constant Current Driver IC | 300mA Adjustable/SOT89-5L/Automotive Lighting/Industrial Indicator Light Dedicated | Replacement for AMC7135/QX7135/BCR420U

Keywords:DW3505A, DONGWOON, Korea Dongwoon Technology, DW3505A Agent, DW3505A Datasheet, DW3505A Technical Document, 300mA Linear Constant Current Driver, SOT89-5L, PWM Dimming LED Driver, Low Dropout Constant Current IC, Automotive Lighting Driver, Indicator Lighting Driver, RGB Backlight Driver, DW3505A Replace AMC7135, DW3505A Replace QX7135, DW3505A Replace BCR320U, DW3505A Replace BCR420U

Product Description:DW3505A is an instant switch type low dropout linear LED constant current driver IC originally launched by DONGWOON Korea Dongwoon Technology. It supports 5~40V wide voltage input and maximum 300mA adjustable output. Built-in thermal derating protection, supports 0~100% PWM dimming, current set by single resistor, minimal peripheral circuit and no EMI interference. DW3505A is specially designed for LED bulbs, indicator decorative lighting, panel backlight, RGB backlight, automotive lighting, general constant current source and other scenarios. It can directly PIN-to-PIN replace mainstream models such as AMC7135, QX7135, BCR320U and BCR420U, with higher constant current accuracy, more stable heat dissipation and stronger reliability.

DW3505A Linear LED Constant Current Driver IC Core Advantages

● Wide input voltage 5~40V, perfectly compatible with 12V/24V vehicle and industrial power supply system

● Output current 0~300mA adjustable, precise setting by single resistor, constant current accuracy ±5%

● Ultra low dropout: 0.2V@60mA, low heat generation and higher conversion efficiency

● Built-in thermal derating protection, automatic current reduction at high temperature, safer and more stable long-term operation

● Support PWM dimming (≤30kHz), 0~100% flicker-free precise dimming

● Only one peripheral resistor required, minimal circuit, low cost and simple PCB layout

● SOT89-5L standard package, small size, good heat dissipation and easy for SMT production

● No EMI interference, easily pass various safety regulations and EMC tests

DW3505A Key Electrical Parameters | Specification Parameters

DW3505A Parameter Item	DW3505A Typical Value	DW3505A Unit
Input Voltage	5~40	V
Output Current	0~300	mA
Dropout Voltage	0.2@60mA	V
Constant Current Accuracy	±5%	--
Thermal Derating Threshold	140	℃
Dimming Mode	PWM	--
Package Type	SOT89-5L	--

DW3505A Chip Pin Definition & Package Dimension | Pin Diagram

DW3505A Pin Diagram DW3505A Package Size SOT89-5L Pin Definition Constant Current Driver IC Pinout

DW3505A Pin No.	DW3505A Pin Name	DW3505A Function Description
1	RS	Output current setting, external resistor to GND
2	GND	Ground
3	EN	Enable & PWM dimming, high level active, recommended ≤30kHz
4	OUT	LED constant current output
5	VDD	Power supply voltage input

DW3505A Internal Circuit Block Diagram | Internal Structure

DW3505A Internal Circuit Block Diagram Linear Constant Current Driver IC Internal Structure

DW3505A Typical Application Circuit | Reference Design

DW3505A 12V Typical Application Circuit Diagram Low Dropout Linear Constant Current Driver

DW3505A 24V Typical Application Circuit Diagram Indicator Lighting Driver Solution

DW3505A PWM Dimming Typical Application Circuit Diagram MCU Controlled Dimming

DW3505A 9-lamp Series Application Circuit Diagram Panel Backlight Driver

DW3505A High Voltage Application Circuit Diagram 80V Input Step-down Solution

DW3505A Application Scenarios | Applicable Fields

● LED bulbs, household lighting and small lighting equipment

● Indicator signs, advertising signs and decorative LED lighting

● Flat panel displays, home appliance panels and general backlight lighting

● RGB backlight, colorful lighting and ambient light driver

● DC/DC, AC/DC matching constant current source and current regulator module

● Automotive interior lights, daytime running lights, signal lights and vehicle lighting

● General constant current source, industrial control and instrument equipment constant current power supply

DW3505A Compatible Replacement Models & Advantage Comparison

DONGWOON DW3505A can be directly PIN TO PIN replaced with: AMC7135, QX7135, BCR320U, BCR420U

● Advantage 1: Wider operating voltage 5~40V, covering more vehicle and industrial scenarios

● Advantage 2: Lower dropout voltage (0.2V@60mA), higher efficiency and lower heat generation

● Advantage 3: Built-in thermal derating protection, most similar competitors have no such protection with higher reliability

● Advantage 4: ±5% constant current accuracy, more stable current under temperature and voltage fluctuation

● Advantage 5: Support higher frequency PWM dimming with smoother and flicker-free dimming effect

DW3505A vs Similar Competitors Parameter Comparison | Replacement Comparison

Item	DW3505A	BCR320U	BCR420U	Advantage Description
Brand	DONGWOON	Infineon	Infineon	Stable original factory supply
Operating Voltage	5~40V	~25V	~40V	Wider voltage range
Max Current	300mA	250mA	150mA	Stronger output capability
Dropout Voltage	0.2V@60mA	1.4V	1.4V	Lower dropout & higher efficiency
Thermal Protection	Yes	No	No	Safer at high temperature
Constant Current Accuracy	±5%	--	±10%	Higher accuracy & more stable

DONGWOON Korea Dongwoon Technology Linear Constant Current Solution Recommendation

	DW8501	DW8502	DW8505A	DW8506	DW8506A	DW3505A
Input Voltage(V)	5~40	5~40	5~40	6.5~40	6.5~40	5~40
Output Current	≤1.5A Adjustable	≤2.5A Adjustable	≤100mA Adjustable	≤100mA Adjustable	Fixed 60mA	≤300mA Adjustable
Dropout Voltage	Max.0.3V@300mA	Max.1V@1A	Max.0.1V@60mA	Max.0.5V@50mA	Max.0.6V@60mA	Max.0.2V@60mA
Dimming	PWM	PWM	PWM	--	--	PWM
Protection Function	Thermal Derating	Thermal Derating	Thermal Derating	Thermal Derating		Thermal Derating
Package	SOT223-5L/TO252-5L	TO263-5L/TO220-5L	SOT23-5L	SOT23-5L	WLCSP	SOT89-5L
Typical Circuit

Brand Agency & Service

GS-Micro Semiconductor (Shenzhen) Co., Ltd. is an officially authorized agent of DONGWOON Korea Dongwoon Technology. We focus on the promotion and technical support of linear constant current driver and power management IC, providing complete datasheet, application solution, sample testing and after-sales technical support to help customers achieve mass production quickly.

Official Website: http://huimai2.com

DW3505A vs BCR320U/BCR420U Performance Parameter Test | DONGWOON Low Dropout Linear Constant Current Driver IC Selection Advantages

Keywords:DW3505A, DONGWOON Korea, BCR320U, BCR420U, DW3505A replace BCR320U, DW3505A compare BCR420U, Linear Constant Current Driver IC, Low Dropout Constant Current IC, PWM Dimming LED Driver IC, Automotive Lighting Constant Current Chip, Vehicle LED Decorative Light Driver, Low Power Constant Current IC, LED Driver With Thermal Protection, DW3505A Parameters, BCR320U Parameter Comparison

Overview:This article conducts a complete performance parameter test on DONGWOON DW3505A versus Infineon BCR320U and BCR420U. It makes a horizontal comparison from multiple dimensions including operating voltage, output current, dropout voltage, temperature protection, current accuracy, PWM dimming, high and low temperature characteristics. The test results prove that DW3505A features ultra-wide voltage range, ultra-low dropout voltage, built-in thermal derating protection and high-precision current stability. It is an ideal alternative to BCR320U/BCR420U for automotive lighting, LED decorative lights, backlight driving and industrial constant current solutions.

DW3505A vs BCR320U/BCR420U Full Parameter Comparison Table

Item	DW3505A	BCR320U	BCR420U	Remark
Manufacturer	DONGWOON	Infineon	Infineon	-
Operating Voltage	5V~40V	~25V	~40V	-
Package Dimension	SOT89-5L (4.5mm X 4.5mm X 1.5mm)	SC74-3D (2.9mm X 2.5mm X 1.1mm)	SC74-6L (2.9mm X 2.5mm X 1.1mm)	-
PWM Dimming	Available (PWM input up to 20KHz)	Available (PWM input up to 10KHz)	Available (PWM input up to 10KHz)	-
Output Current	Up to 300mA Adjustable	Up to 250mA Adjustable	Up to 150mA Adjustable	Depends on package surface temperature and heat dissipation condition
Thermal Protection	Yes	No	No	Required for high-temperature resistant LED modules
Output Dropout Voltage	0.1V@60mA	1.4V (Iout>18mA)	1.4V (Iout>18mA)	DW3505A supports more LED modules installed on SMPS
Temperature Drift	Under ±2% (at 60mA)	-	±10% (at 52mA)	Temperature range: -40℃~145℃
Iout Variation With VEN	Under ±0.5% (VEN 5~40V)	-	40mA~52mA (VEN 5V~25V)	BCR320U requires strict VEN voltage selection
Current Accuracy	±5% (at 60mA)	-	±10% (at 10mA)	-

Influence of High & Low Temperature on DW3505A Constant Current Output Characteristics

Test Condition: Input 12V, Output 3V, Output Current 60mA/150mA, Temperature Range -40℃~150℃

DONGWOON DW3505A temperature characteristic curve | High and low temperature impact on constant current output vs BCR320U

DW3505A Constant Current Output Accuracy Test Data

Output Current Accuracy @60mA: -1.3% ~ 0.68%

Output Current Accuracy @150mA: -1.52% ~ 1.31%

When DW3505A operates at 140℃~150℃ high temperature range and activates thermal derating protection, the output current will automatically drop to 1/4 of the normal value, ensuring chip and lamp safety.

BCR320U has no built-in thermal protection circuit, which brings burnout risk under high-temperature operation and is not suitable for harsh high-temperature working conditions of vehicle applications.

Influence of EN Pin Voltage Fluctuation on DW3505A Output Current Stability

DW3505A Test Condition: Input Voltage 30V, EN Voltage 0V~30V, Output Voltage 2V, RSET Configuration, Ta=25℃

BCR320U Test Condition: IOUT=F(VEN), VOUT=2V, REXT=3Ω, Refer to Datasheet Page 16

DONGWOON DW3505A EN voltage and output current characteristic diagram | DW3505A stability comparison with BCR320U

DW3505A can work normally when EN pin voltage is higher than 2V, with output current accuracy up to ±0.01%. It features excellent voltage adaptability and is ideal for vehicle power supply environment with large voltage fluctuation.

The output current of BCR320U fluctuates obviously with EN pin voltage. Its current stability and controllability are far lower than DW3505A, which is not conducive to high-precision LED lighting solution design.

Summary of Core Selection Advantages: DW3505A vs BCR320U/BCR420U

1. DW3505A supports 5~40V ultra-wide operating voltage, higher than BCR320U upper limit 25V. It perfectly adapts to harsh power supply scenarios of vehicle and industrial equipment, more friendly for automotive lighting solution selection.

2. DW3505A ultra-low dropout voltage only 0.1V@60mA, much lower than 1.4V of BCR series. It generates less heat and achieves higher power conversion efficiency, suitable for multi-LED series module design.

3. DW3505A is built-in with thermal derating protection, while BCR320U/BCR420U have no thermal protection function. DW3505A owns higher reliability and burnout resistance under long-term high-temperature continuous operation.

4. DW3505A current accuracy reaches ±5%, its stability under temperature and voltage fluctuation is far better than BCR420U with ±10% accuracy, delivering more uniform and consistent light brightness.

5. DW3505A supports up to 20kHz PWM dimming with smooth flicker-free dimming performance, better than 10kHz upper limit of BCR series, suitable for interior ambient light and backlight fine dimming applications.

DW3505A Selection FAQ

Q1: Can DW3505A directly replace BCR320U?
A1: Direct pin-to-pin compatible replacement available. DW3505A matches package size, features wider adjustable current range, ultra-low dropout voltage and built-in thermal protection, with overall performance surpassing BCR320U comprehensively.

Q2: Which one provides better PWM dimming effect, DW3505A or BCR420U?
A2: DW3505A supports 20kHz high-frequency PWM dimming, far exceeding 10kHz limit of BCR420U. It achieves smoother dimming transition and better flicker-free visual experience.

Q3: Can BCR320U be used in automotive high-temperature scenarios without thermal protection?
A3: Not recommended. BCR320U/BCR420U lack built-in thermal protection circuit, easy to burn out under long-term operation in summer high-temperature vehicle environment. DW3505A comes with thermal derating protection, more suitable for harsh working conditions of automotive lighting.

Q4: What is the biggest advantage of DW3505A compared with BCR series?
A4: Five core advantages: 40V ultra-high withstand voltage, 0.1V ultra-low on-state dropout voltage, tiny current drift under high and low temperature, built-in thermal protection and high-frequency PWM dimming. It is the preferred alternative device for industrial and vehicle LED constant current driver applications.