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PDF IW1690 Data sheet ( Hoja de datos )
| Número de pieza | IW1690 | |
| Descripción | Low-Power Off-line Digital PWM Controller | |
| Fabricantes | iWatt | |
| Logotipo |  |
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iW1690
Low-Power Off-line Digital PWM Controller
1.0 Features
• Primary-side feedback eliminates opto-isolators and
simplifies design
• Direct drive of BJT switching device
• Multi-mode operation for highest overall efficiency
• 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
feedback
• Low start-up current (10 µA typical)
• Built-in soft start
• Built-in short circuit protection and output overvoltage
protection
• Optional AC line under/overvoltage protection
• Fixed switching frequency: 45 kHz, 65 kHz or 75 kHz
• Dynamic base current control
• PFM operation at light load
• Built-in current sense resistor short protection
2.0 Description
The iW1690 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
directly drives a BJT switching device and provides 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 iW1690 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.
The ultra-low start-up power and operating current at light
load ensure that the iW1690 is ideal for applications targeting
the newest regulatory standards for average efficiency and
standby power.
3.0 Applications
• Low power AC/DC adapter/chargers for cell phones,
PDAs, digital still cameras
• Low power AC/DC adapter/chargers to replace RCC
implementations
L
N
+
+ VOUT
GND
1 VSENSE
VCC 8
2 VIN
OUTPUT 7
3 RIN
4 IBC
ISENSE 6
GND 5
U1
iW1690
Figure 2.0.1 iW1690 Typical Application Circuit
Rev. 1.8
iW1690
February 3, 2012
Page 1
1 page  
iW1690
Low-Power Off-line Digital PWM Controller
7.0 Typical Performance Characteristics
48 2.004
47
2.002
46
45
44
43
42
-50
VCC = 12 V
-25 0 25 50 75
Ambient Temperature (°C)
100
Figure 7.0.1 Switching Frequency vs. Temperature
-01/-02/-03/-08 Suffixes
69
2.000
1.998
1.996
-50
VCC = 12 V
-25 0 25 50 75
Ambient Temperature (°C)
100
Figure 7.0.4 Internal Reference vs. Temperature
100
67
65
63
61
-50
VCC = 12 V
-25 0 25 50 75
Ambient Temperature (°C)
100
Figure 7.0.2 Switching Frequency vs. Temperature
-00/-05 Suffixes
12.2
80
KBC = 31
60
40
20
KBC = 10
0
40
60 80
RBC (kΩ)
Figure 7.0.5 IOUT vs. RBC
100
12.1
12.0
11.9
11.8
-50
-25 0 25 50 75
Ambient Temperature (°C)
Figure 7.0.3 Start-Up vs. Temperature
100
Rev. 1.8
iW1690
February 3, 2012
Page 5
5 Page 
iW1690
Low-Power Off-line Digital PWM Controller
10.0 Physical Dimensions
8-Lead Small Outline (SOIC) Package
D
8
E1
5
4
e
A1
B
COPLANARITY
0.10 (0.004)
Inches
H
A2 A
SEATING
PLANE
C
h x 45°
αL
MIN MAX
A 0.053 0.069
A1 0.0040 0.010
A2 0.049 0.059
B 0.014 0.019
C 0.007 0.010
D 0.189 0.197
E 0.150 0.157
e 0.050 BSC
H 0.228 0.244
h 0.10 0.020
L 0.016 0.049
α 0°
8°
Figure 10.0.1. Physical dimensions, 8-lead SOIC package
Compliant to JEDEC Standard MS12F
Controlling dimensions are in inches; millimeter dimensions are for reference only
This product 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; package can withstand
10 s immersion < 270˚C
Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs shall
not exceed 0.15 mm per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or
protrusion shall not exceed 0.25 mm per side.
The package top may be smaller than the package bottom. Dimensions D and E1 are determined at the
outermost extremes of the plastic bocy exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but
including any mismatch between the top and bottom of the plastic body.
Millimeters
MIN MAX
1.35 1.75
0.10 0.25
1.25 1.50
0.35 0.49
0.19 0.25
4.80 5.00
3.80 4.00
1.27 BSC
5.80 6.20
0.25 0.50
0.4 1.25
Rev. 1.8
iW1690
February 3, 2012
Page 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet IW1690.PDF ] | |
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