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PDF IW1697 Data sheet ( Hoja de datos )
| Número de pieza | IW1697 | |
| Descripción | Low-Power Off-Line Digital Green-Mode PWM Controller | |
| Fabricantes | iWatt | |
| Logotipo |  |
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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
1 page  
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
5 Page 
iW1697
Low-Power Off-Line Digital Green-Mode PWM Controller
10.0 Physical Dimensions
6-Lead SOT Package
D
654
E1 E
12 3
A
A1
A2
eB
C
e1 D
E
A1 A2 A
E1
e
αL
e1
COPLANARITY
B
SEATING
PLANE
CL
α
0.10
Figure 10.1: Physical dimensions, 6-lead SOT-23 package
Compliant to JEDEC Standard MO-178AB
Controlling dimensions are in millimeters
This package is RoHS compliant and Halide free.
Soldering Temperature Resistance:
[a] Package is IPC/JEDEC Std 020D Moisture Sensitivity Level 1
[b] Package exceeds JEDEC Std No. 22-A111 for Solder Immersion Resistance;
packages can withstand 10 s immersion < 270ºC
Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions
or gate burrs shall not exceed 0.25 mm per side.
The package top may be smaller than the package bottom. Dimensions D and E1 are
are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar
burrs and interlead flash, but including any mismatch between top and bottom of the plastic
body.
Millimeters
MIN MAX
- 1.45
0.00 0.15
0.90 1.30
0.30 0.50
0.08 0.22
2.820.90 BS3C.00
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.30 0.60
0° 8°
11.0 Ordering Information
Part Number
iW1697-01
iW1697-03
iW1697-05
Options
Cable Comp = 300 mV
Cable Comp = 450 mV
Cable Comp = 150 mV
Package
SOT-23
SOT-23
SOT-23
Description
Tape & Reel1
Tape & Reel1
Tape & Reel1
Note 1: Tape & Reel packing quantity is 3,000 per reel. Minimum ordering quantity is 3,000.
Rev. 1.1
iW1697
February 1, 2012
Page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet IW1697.PDF ] | |
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