Datasheet > IW1678-01

IW1678-01

更新时间： 2022-02-26 11:44:06

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

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IW1678-01 数据手册

iW1678

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

1.0 Features

● Primary-side feedback eliminates opto-isolators and

2.0 Description

The iW1678 is a high performance AC/DC power supply

controller which uses digital control technology to build peak

current mode PWM ﬂyback power supplies. The iW1678’s

64-kHz PWM switching frequency allows the design of ultra-

compact AC/DC adapters and chargers. 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 iW1678 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

● 64-kHz PWM switching frequency

● No-load power consumption < 100 mW at 230 V_acwith

tight dynamic load transient response

● Able to meet < 30 mW no-load power consumption with

large value pre-load resistor

● 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

iWatt’s innovative proprietary technology ensures that power

supplies built with iW1678 can achieve both highest average

efﬁciency and less than 100 mW no-load power consumption

in a compact form factor.

● Complies with EPA 2.0 energy-efﬁciency speciﬁcations

with ample margin

● Low start-up current (8 μA typical)

● Built-in soft start

3.0 Applications

● Built-in short circuit protection and output overvoltage

● Low power compact AC/DC adapter/chargers for cell

protection

phones, PDAs, digital still cameras

● Built-in current sense resistor short circuit protection

● Linear AC/DC replacement

● No audible noise over entire operating range

OUT

GND

iW1678

OUTPUT

GND

SENSE

Figure 3.1: iW1678 Typical Application Circuit

Rev. 1.1

iW1678

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