Datasheet > IW1691-11

IW1691-11

更新时间： 2024-11-20 00:54:51

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描述
Digital PWM Current-Mode Controller for Quasi-Resonant Operation

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IW1691-11 数据手册

iW1691

Digital PWM Current-Mode Controller for Quasi-Resonant Operation

1.0 Features

2.0 Description

● Primary-side feedback eliminates opto-isolators and The iW1691 is a high performance AC/DC power supply

simpliﬁes design

controller 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 iW1691 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

current limit function enables optimized transformer design

● 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

● Built-in cable drop compensation

● Very tight output voltage regulation

● No external compensation components required

● Complies with CEC/EPA no-load power consumption

and average efﬁciency regulations

● Built-in output constant-current control with primary-side in universal off-line applications over a wide input voltage

feedback

range.

● Low start-up current (10 µA typical)

● Built-in soft start

The ultra-low operating current at light load ensures that

the iW1691 is ideal for applications targeting the newest

regulatory standards for average efﬁciency and standby

● Built-in short circuit protection and output overvoltage

power.

protection

● Optional AC line under/overvoltage protection

● PFM operation at light load

3.0 Applications

● AC/DC adapter/chargers for cell phones, PDAs, digital

still cameras

● Current sense resistor short protection

● AC/DC adapters for consumer electronics

● Overtemperature Protection

OUT

RTN

OUTPUT

SENSE

GND

Optional

NTC

Thermistor

iW1691

Figure 3.1 : Typical Application Circuit

Rev. 2.0

iW1691

FebRuaRy 3, 2012

Page 1

12 3 4 5 6 7...24

中文翻译

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与IW1691-11相关器件

型号	品牌	获取价格	描述	数据表
IW1692	ETC	获取价格
iW1692	RENESAS	获取价格	Low-Power Off-line Digital PWM Controller
IW1696	DIALOG	获取价格	Low-Power Off-line Digital Green-Mode PWM Controller
IW1696-00	DIALOG	获取价格	Low-Power Off-line Digital Green-Mode PWM Controller
IW1696-01	DIALOG	获取价格	Low-Power Off-line Digital Green-Mode PWM Controller
IW1696-03	DIALOG	获取价格	Low-Power Off-line Digital Green-Mode PWM Controller
IW1696-04	DIALOG	获取价格	Low-Power Off-line Digital Green-Mode PWM Controller
IW1697	DIALOG	获取价格	Low-Power Off-Line Digital Green-Mode PWM Controller
iW1697	RENESAS	获取价格	PrimAccurate? Off-Line Digital PWM Controller in a SOT-23 Package
IW1697-01	DIALOG	获取价格	Low-Power Off-Line Digital Green-Mode PWM Controller

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