Datasheet > iW3620

iW3620

更新时间： 2023-12-20 18:44:36

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
21页	1405K
描述
Digital Offline 40W PWM Controller with PrimAccurate? Primary-Side Control for LED Driving

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iW3620 数据手册

iW3620

Digital PWM Current-Mode Controller for AC/DC LED Driver

1.0 Fꢀꢁtꢂꢃꢀs

2.0 Dꢀscꢃiption

● Primary-side feedback eliminates opto-isolators and The iW3620 is a high performance AC/DC oﬄine LED driver

simpliﬁes design

which uses digital control technology to build peak current

mode PWM ﬂyback power supplies. The device operates in

quasi-resonant mode at heavy load to provide high eﬃciency

along with a number of key built-in protection features while

minimizing the external component count, simplifying EMI

design and lowering the total bill of material cost. The

iW3620 removes the need for secondary feedback circuitry

while achieving excellent line and load regulation. It also

eliminates the need for loop compensation components while

maintaining stability over all operating conditions. Pulse-by-

● Quasi-resonant operation for highest overall eﬃciency

●

EZ-EMI ^®design to easily meet global EMI standards

● Up to 130 kHz switching frequency enables small

adapter size

● Very tight LED constant current regulation

● No external compensation components required

● Built-in output constant-current control with primary-side pulse waveform analysis allows for a loop response that is

feedback for LED driver.

● Low start-up current (10 µA typical)

● Built-in soft start

much faster than traditional solutions, resulting in improved

dynamic load response. The built-in current limit function

enables optimized transformer design in universal oﬀ-line

applications over a wide input voltage range.

● Built-in short circuit protection and output overvoltage

3.0 Applicꢁtions

● LED lighting

protection

● Current sense resistor short protection

● Overtemperature Protection

● Open circuit protection

● Universal input range from 85 V_acto 264 V_ac

● Single-fault protection

● Small input bulk capacitor

● Long MTBF

● High eﬃciency

OUT

RTN

OUTPUT

SENSE

GND

Optional

NTC

Thermistor

iW3620

Figure 3.1 : Typical Application Circuit

Rev. 1.9

iW3620

February 4, 2022

Page 1

12 3 4 5 6 7...21

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