Datasheet > IW1698-00

IW1698-00

更新时间： 2024-11-24 01:12:59

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Low-Power Off-line Digital Green-Mode PWM Controller

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IW1698-00 数据手册

iW1698

Low-Power Off-line Digital Green-Mode PWM Controller

1.0 Features

● Primary-side feedback eliminates opto-isolators and

2.0 Description

The iW1698 is a high performance AC/DC power supply

controller which uses digital control technology to build peak

current mode PWM ﬂyback power supplies. The device

directly drives a power BJT and operates in quasi-resonant

mode 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 iW1698 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-pulse waveform analysis

allows for a loop response that is much faster than traditional

solutions, resulting in improved dynamic load response. The

built-in power limit function enables optimized transformer

design in universal off-line applications and allows for a wide

input voltage range.

simpliﬁes design

● No-load power consumption < 30 mW at 230 V_acwith

typical application circuit (5 star rating)

● Adaptive multi-mode PWM/PFM control improves

efﬁciency

● Quasi-resonant operation for highest overall efﬁciency

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

● Direct drive of low-cost BJT switch

● Dynamic base current control

● Very tight constant voltage and constant current

regulation with primary-side-only feedback

● No external compensation components required

● Complies with EPA 2.0 energy-efﬁciency speciﬁcations

with ample margin

iWatt’s innovative proprietary technology ensures that power

supplies built with iW1698 can achieve both highest average

efﬁciency and less than 30 mW no-load power consumption

with typical application circuit.

● Low start-up current (8 μA typical)

● Built-in soft start

● Built-in short circuit protection and output overvoltage

3.0 Applications

protection

● Built-in current sense resistor short circuit protection

● No audible noise over entire operating range

● Low power AC/DC adapter/chargers for cell phones,

PDAs, digital still cameras

● Linear AC/DC replacement

OUT

GND

iW1698

OUTPUT

GND

SENSE

Figure 3.1: iW1698 Typical Application Circuit (Achieving < 30 mW No-load Power Consumption)

Rev. 1.2

iW1698

FebRuaRy 6, 2012

Page 1

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中文翻译

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与IW1698-00相关器件

型号	品牌	获取价格	描述	数据表
IW1698-05	DIALOG	获取价格	Low-Power Off-line Digital Green-Mode PWM Controller
iW1699	RENESAS	获取价格	30W AC/DC Off-Line Controller for Power Adapters
iW1699B	RENESAS	获取价格	30W AC/DC Off-Line Controller for Power Adapters Offers Lower Output Ripple, Wider Input V
IW1700	DIALOG	获取价格	Zero Power No-Load Off-Line Digital PWM Controller
iW1700	RENESAS	获取价格	PrimAccurate? Zero No-Load Power Off-Line Digital PWM Controller in a SOT-23 Package
IW1700-00	DIALOG	获取价格	Zero Power No-Load Off-Line Digital PWM Controller
IW1700-01	DIALOG	获取价格	Zero Power No-Load Off-Line Digital PWM Controller
IW1700-03	DIALOG	获取价格	Zero Power No-Load Off-Line Digital PWM Controller
IW1700-05	DIALOG	获取价格	Zero Power No-Load Off-Line Digital PWM Controller
iW1702	RENESAS	获取价格	45W Digital AC/DC PWM Controller with Configurable Light Load Operation Mode Optimized for

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