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What is IW1697?

This electronic component, produced by the manufacturer "iWatt", performs the same function as "Low-Power Off-Line Digital Green-Mode PWM Controller".


IW1697 Datasheet PDF - iWatt

Part Number IW1697
Description Low-Power Off-Line Digital Green-Mode PWM Controller
Manufacturers iWatt 
Logo iWatt Logo 


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iW1697
Low-Power Off-Line Digital Green-Mode PWM Controller
1.0 Features
● Primary-side feedback eliminates opto-isolators and
simplifies design
● No-load power consumption < 20 mW at 230 Vac with
typical application circuit (5 star rating)
● Active start-up scheme enables fastest possible start-
up
● Fast dynamic load response
● 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
Ultra-low start-up current (1.5 μA typical)
● Built-in soft start
Built-in short circuit protection and output overvoltage
protection
● Built-in current sense resistor short circuit protection
No audible noise over entire operating range
L
2.0 Description
The iW1697 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 together with an external active device (depletion
mode NFET or NPN BJT) provides a fast start-up without
compromising no-load power loss. 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 iW1697 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.
iWatt’s innovative proprietary technology ensures that
power supplies built with iW1697 can achieve both highest
average efficiency and less than 20 mW no-load power
consumption, and have fast dynamic load response, all
with a typical application circuit. The active start-up scheme
enables shortest possible start-up time without sacrificing
no-load power loss.
3.0 Applications
Low power AC/DC adapter/chargers for cell phones,
PDAs, digital still cameras
● Linear AC/DC replacement
+
N
+ VOUT
GND
U1
iW1697
1 VCC
OUTPUT 6
2 VSENSE
GND 5
3 ASU
ISENSE 4
Rev. 1.1
Figure 3.1: iW1697 Typical Application Circuit
(Achieving < 20 mW No-load Power Consumption. Using Depletion Mode NFET as Active Start-up Device)
iW1697
February 1, 2012
Page 1

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IW1697 equivalent
iW1697
Low-Power Off-Line Digital Green-Mode PWM Controller
7.0 Typical Performance Characteristics
4.08 12.0
4.04 11.6
4.00 11.2
3.96 10.8
3.92 10.4
3.88-50 -25 0
25 50 75 100 125
Ambient Temperature (ºC)
Figure 7.1 : VCC UVLO vs. Temperature
150
44
10.0-50 -25 0 25 50 75 100 125 150
Ambient Temperature (ºC)
Figure 7.2 : Start-Up Threshold vs. Temperature
2.010
42 2.006
40 2.002
38 1.998
36 1.994
34-50 -25 0 25 50 75 100 125 150
Ambient Temperature (ºC)
Figure 7.3 : Switching Frequency vs. Temperature1
2.0
1.990-50 -25 0 25 50 75 100 125 150
Ambient Temperature (ºC)
Figure 7.4 : Internal Reference vs. Temperature
1.4
1.2
0.8
0.4
0.00.0
3.0 6.0
VCC (V)
9.0
12.0
Figure 7.5 : VCC vs. VCC Supply Start-up Current
Notes:
Note 1. Operating frequency varies based on the load conditions, see Section 9.6 for more details.
Rev. 1.1
iW1697
February 1, 2012
Page 5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for IW1697 electronic component.


Information Total 12 Pages
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