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PDF IW1700 Data sheet ( Hoja de datos )
| Número de pieza | IW1700 | |
| Descripción | Zero Power No-Load Off-Line Digital PWM Controller | |
| Fabricantes | iWatt | |
| Logotipo |  |
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iW1700
Zero Power No-Load Off-Line Digital PWM Controller
1.0 Features
●● Zero power consumption at no-load with lowest system
cost (< 5 mW at 230 Vac with typical application circuit)
●● Intelligent low power management achieves ultra-low
operating current at no-load
●● Adaptive load transient detection and fast response
●● Very tight constant voltage and constant current
regulation over entire operating range
●● Primary-side feedback eliminates opto-isolators and
simplifies design
●● EZ-EMI ® design enhances manufacturability
●● Intrinsically low common mode noise
●● Optimized 72 kHz maximum PWM switching frequency
achieves best size and efficiency
●● Active start-up scheme enables fastest possible start-up
●● Adaptive multi-mode PWM/PFM control improves
efficiency
●● Quasi-resonant operation for highest overall efficiency
●● Direct drive of low-cost BJT switch
●● No external compensation components required
●● Complies with EPA 2.0 energy-efficiency specifications
with ample margin
●● 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
2.0 Description
The iW1700 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 meanwhile
achieving ultra-low no-load power consumption. 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 iW1700 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,
for both one-time and repetitive load transient. 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 the iW1700 can achieve both highest
average efficiency and zero no-load power consumption,
and have fast load transient response in a compact form
factor. The active start-up scheme enables shortest possible
start-up time without sacrificing no-load power loss.
3.0 Applications
●● Compact AC/DC adapter/chargers for cell phones,
PDAs, digital still cameras
●● Linear AC/DC replacement
L
+
N
+ VOUT
GND
U1
iW1700
1 VCC
OUTPUT 6
2 VSENSE
GND 5
3 ASU
ISENSE 4
Figure 3.1: iW1700 Typical Application Circuit
(Achieving < 5 mW No-load Power Consumption. Using Depletion Mode NFET as Active Start-up Device)
Rev. 1.2
iW1700
February 13, 2012
Page 1
1 page  
iW1700
Zero Power No-Load Off-Line Digital 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
80
10.0-50 -25 0 25 50 75 100 125 150
Ambient Temperature (ºC)
Figure 7.2 : Start-Up Threshold vs. Temperature
2.010
76 2.006
72 2.002
68 1.998
64 1.994
60-50 -25 0 25 50 75 100 125 150
Ambient Temperature (ºC)
Figure 7.3 : Switching Frequency vs. Temperature1
2.5
2.0
1.5
1.990-50 -25 0
25 50 75 100 125 150
Ambient Temperature (ºC)
Figure 7.4 : Internal Reference vs. Temperature
1.0
0.5
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. 1.2
iW1700
February 13, 2012
Page 5
5 Page 
iW1700
Zero Power No-Load Off-Line Digital 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
iW1700-00
iW1700-01
iW1700-03
iW1700-05
Options
Cable Comp = 0 mV
Cable Comp = 300 mV
Cable Comp = 450 mV
Cable Comp = 150 mV
Package
SOT-23
SOT-23
SOT-23
SOT-23
Description
Tape & Reel1
Tape & Reel1
Tape & Reel1
Tape & Reel1
Note 1: Tape & Reel packing quantity is 3,000 per reel. Minimum ordering quantity is 3,000.
Rev. 1.2
iW1700
February 13, 2012
Page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet IW1700.PDF ] | |
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