Dialog IW1690 Low-power off-line digital pwm controller Datasheet

iW1690
Low-Power Off-line Digital PWM Controller
2.0 Description
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
D
ew
N
Fo
r
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
d
de
m
en
L
N
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.
es
i
•
gn
s
1.0 Features
•
Low power AC/DC adapter/chargers for cell phones,
PDAs, digital still cameras
•
Low power AC/DC adapter/chargers to replace RCC
implementations
+
VOUT
GND
N
ot
R
ec
om
+
1
VSENSE
VCC
8
2
VIN
OUTPUT
7
3
RIN
ISENSE
6
4
IBC
GND 5
U1
iW1690
Figure 2.0.1 iW1690 Typical Application Circuit
Rev. 1.8
iW1690
February 3, 2012
Page 1
iW1690
Low-Power Off-line Digital PWM Controller
4.0 Pinout Description
VCC
8
2
VIN
OUTPUT
7
3
RIN
ISENSE
6
4
IBC
GND
5
es
i
VSENSE
Pin #
Name
Pin Description
1
VSENSE
2
VIN
Analog Input Rectified AC line voltage sense.
3
RIN
Analog Input Sense line input voltage.
4
IBC
Analog Input Adjust maximum base current.
5
GND
6
ISENSE
7
OUTPUT
Output
8
VCC
Power Input
N
Type
ew
D
1
gn
s
iW1690
Ground
Ground.
d
Fo
r
Analog Input Auxiliary voltage sense (used for primary regulation and ZVS).
de
Analog Input Primary current sense. Used for cycle-by-cycle peak current control and limit.
m
en
Base drive for BJT.
N
ot
R
ec
om
Power supply for control logic and voltage sense for power-on reset circuitry.
Rev. 1.8
iW1690
February 3, 2012
Page 2
iW1690
Low-Power Off-line Digital PWM Controller
5.0 Absolute Maximum Ratings
Symbol
Value
DC supply voltage range (pin 8, ICC = 20mA max)
VCC
-0.3 to 18
Continuous DC supply current at VCC pin
ICC
20
mA
120
mA
Low voltage output (pin 7)
VIN input (pin 2)
V
-0.6 to 4.0
V
-0.3 to 18.0
V
-0.3 to 4.0
V
PD
526
mW
TJ MAX
125
°C
TSTG
–65 to 150
°C
TLEAD
260
°C
θJA
160
°C/W
2,000
V
±100
mA
N
Low voltage analog input (pins 3, 4 and 6)
Power dissipation at TA ≤ 25°C
Storage temperature
Thermal Resistance Junction-to-Ambient
m
en
de
ESD rating per JEDEC JESD22-A114 (HBM)
d
Lead temperature during IR reflow for ≤ 15 seconds
Fo
r
Maximum junction temperature
Latch-Up test per JEDEC 78
-0.3 to 4.0
ew
VSENSE input (pin 1)
V
D
ICCPK
Peak DC supply current at VCC pin
Units
es
i
Parameter
gn
s
Absolute maximum ratings are the parameteic values or ranges which can cause permanent damage if exceeded. For
maximum safe operating conditions, refer to Electrical Characteristics in Section 6.0.
6.0 Electrical Characteristics
Parameter
om
VCC = 12 V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1)
Symbol
Test Conditions
Min
Typ
Max
Unit
VIN SECTION (Pin 2)
VINST(LO)
TA= 25°C, positive edge
332
370
407
mV
Start-up voltage high threshold
VINST(HI)
TA= 25°C, positive edge
1.755
1.950
2.145
V
8
15
µA
ec
Start-up voltage low threshold
IIN(ST)
VCC = 10 V
Shutdown low voltage threshold
VUVDC
TA= 25°C, negative edge
203
225
248
mV
Shutdown high voltage threshold
VOVDC
TA= 25°C, positive edge
1.791
1.990
2.189
V
IVSENSE
VSENSE = 2 V
1
μA
ot
R
Start-up current
N
VSENSE SECTION (Pin 1)
Input leakage current
Nominal voltage threshold
VSENSE(NOM)
TA=25°C, negative edge
1.522
1.538
1.553
V
Output OVP threshold
VSENSE(MAX)
TA=25°C, negative edge
1.667
1.700
1.734
V
Rev. 1.8
iW1690
February 3, 2012
Page 3
iW1690
Low-Power Off-line Digital PWM Controller
VCC = 12 V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
3
6.0
W
OUTPUT SECTION (Pin 7)
fS
ISINK = 5 mA
-02/-03/-08/-09 Suffixes
PLOAD > 15% of maximum
ew
VOCP
CC limit threshold
VCC-TH
Input leakage current
IISENSE
ISENSE = 1 V
IRIN
RIN = 1 V
VIBC
RBC = 100 kW
kHz
1.2
V
1.1
V
2.5
µA
10
µA
VCC SECTION (Pin 8)
Undervoltage lockout threshold
om
1
VCC(MAX)
V
16
V
VCC(ST)
VCC rising
11
12
13.2
V
VCC(UVL)
VCC falling
5.0
5.5
6.1
V
2.5
6.0
mA
m
en
Maximum operating voltage
Fo
r
IBC pin voltage
de
IBC SECTION (Pin 4)
Notes:
kHz
65
1.6
d
Input leakage current
Quiescent current
N
Overcurrent limit threshold
Start-up threshold
45
-00/-05 Suffixes
PLOAD > 15% of maximum
ISENSE SECTION (Pin 6)
RIN SECTION (Pin 3)
es
i
Output switching frequency
RDS(ON)LO
D
Output low level ON-resistance
gn
s
6.0 Electrical Characteristics
ICCQ
RBC = 100 kW,
no IBcurrent
ec
Note 1. Adjust VCC above the start-up threshold before setting at 12 V.
N
ot
R
Note 2. These parameters are not 100% tested, guaranteed by design and characterization.
Rev. 1.8
iW1690
February 3, 2012
Page 4
iW1690
Low-Power Off-line Digital PWM Controller
7.0 Typical Performance Characteristics
44
43
VCC = 12 V
-50
-25
0
25
50
Ambient Temperature (°C)
75
gn
s
2.000
1.998
1.996
100
es
i
45
2.002
D
46
-50
ew
47
42
-25
0
25
VCC = 12 V
50
Ambient Temperature (°C)
75
100
Figure 7.0.4 Internal Reference vs. Temperature
69
100
Fo
r
N
Figure 7.0.1 Switching Frequency vs. Temperature
-01/-02/-03/-08 Suffixes
d
65
63
IOUT (mA)
80
67
de
Switching Frequency (kHz)
Internal Reference Voltage (V)
2.004
m
en
Switching Frequency (kHz)
48
60
40
20
VCC = 12 V
61
-50
-25
0
25
50
Ambient Temperature (°C)
75
100
om
Figure 7.0.2 Switching Frequency vs. Temperature
-00/-05 Suffixes
0
KBC = 10
40
60
RBC (kΩ)
80
100
Figure 7.0.5 IOUT vs. RBC
ec
VCC Start-up Threshold (V)
12.2
KBC = 31
R
12.1
ot
12.0
N
11.9
11.8
-50
-25
0
25
50
Ambient Temperature (°C)
75
100
Figure 7.0.3 Start-Up vs. Temperature
Rev. 1.8
iW1690
February 3, 2012
Page 5
iW1690
Low-Power Off-line Digital PWM Controller
3
Start-up
ENABLE
ENABLE
VIN_A
0.2 V ~ 2.0 V
ADC
1V
VCC
4
IBC
D
RIN
8
2
es
i
VIN
gn
s
8.0 Functional Block Diagram
Signal
Conditioning
1
Digital
Logic
Control
VVMS
N
VFB
ew
VSENSE
VOCP
5
r
GND
Fo
DAC
IPEAK
0.2 V ~ 1.1 V
1.2 V
ISENSE
6
+
– –
d
VIPK
–
+
OUTPUT
7
m
en
9.0 Theory of Operation
de
Figure 8.0.1 iW1690 Functional Block Diagram
R
ec
om
The iW1690 is a digital controller which uses a new,
proprietary primary-side control technology to eliminate the
opto-isolated feedback and secondary regulation circuits
required in traditional designs. This results in a low-cost
solution for low power AC/DC adapters. The core PWM
processor uses fixed-frequency Discontinuous Conduction
Mode (DCM) operation at higher power levels and switches
to variable frequency operation at light loads to maximize
efficiency. Furthermore, iWatt’s digital control technology
enables fast dynamic response, tight output regulation, and
full featured circuit protection with primary-side control.
N
ot
Referring to the block diagram in Figure 8.0.1, the digital logic
control block generates the switching on-time and off-time
information based on the line voltage and the output voltage
feedback signal and provides commands to dynamically
control the BJT base current. The system loop is automatically
compensated internally by a digital error amplifier. Adequate
system phase margin and gain margin are guaranteed by
design and no external analog components are required for
loop compensation. The iW1690 uses an advanced digital
control algorithm to reduce system design time and improve
reliability.
Rev. 1.8
Furthermore, accurate secondary constant-current operation
is achieved without the need for any secondary-side sense
and control circuits.
The iW1690 uses PWM mode control at higher output power
levels and switches to PFM mode at light load to minimize
power dissipation to meet the Blue Angel specification.
Additional built-in protection features include overvoltage
protection (OVP), output short circuit protection (SCP) and
soft-start, AC low line brown out, overcurrent protection,
single pin fault protection and Isense fault protection.
iWatt’s digital control scheme is specifically designed to
address the challenges and trade-offs of power conversion
design. This innovative technology is ideal for balancing new
regulatory requirements for green mode operation with more
practical design considerations such as lowest possible cost,
smallest size and high performance output control.
iW1690
February 3, 2012
Page 6
iW1690
Low-Power Off-line Digital PWM Controller
9.2 Start-up
Pin 1 – VSENSE
Prior to start-up the VIN pin charges up the VCC capacitor
through the diode between VIN and VCC.
Pin 3 – RIN
If at any time the VCC voltage drops below VCC(UVL) threshold
then all the digital logic is fully reset. At this time ENABLE
switches off so that the VCC capacitor can be charged up
again towards the start-up threshold.
N
Sense line input voltage. Connect this pin to GND with the
RIN resistor.
es
i
Sense signal input representing the rectified line voltage. VIN
is used for line regulation. The input line voltage is scaled
using a resistor network. It also provides input undervoltage
and overvoltage protection. This pin also provides the supply
current to the IC during start-up.
D
Pin 2 – VIN
When VCC is fully charged to a voltage higher than the startup threshold VCC(ST), the ENABLE signal becomes active to
enable the control logic, the ENABLE switch turns on, and
the analog-to-digital converter begins to sense the input
voltage. Once the voltage on the VIN pin is above VINST(LO) but
below VINST(HI), the iW1690 commences soft start function.
An adaptive soft-start control algorithm is applied at startup
state, during which the initial output pulses will be small and
gradually get larger until the full pulse width is achieved. The
peak current is limited cycle by cycle by Ipeak comparator.
ew
Sense signal input from auxiliary winding. This provides the
secondary voltage feedback used for output regulation.
gn
s
9.1 Pin Detail
Pin 4 – IBC
Fo
Pin 5 – GND
r
Adjusts the maximum base current for the BJT drive.
Ground.
Start-up
Sequencing
VIN
d
Pin 6 – ISENSE
m
en
Pin 7 – OUTPUT
de
Primary current sense. Used for cycle-cycle peak current
control limit.
Base drive for the external power BJT switch.
Pin 8 – VCC
VCC
ENABLE
Figure 9.2.1 Start-up Sequencing Diagram
9.3 Understanding Primary Feedback
Figure 9.3.1 illustrates a simplified flyback converter. When
the switch Q1 conducts during tON(t), the current ig(t) is
directly drawn from rectified sinusoid vg(t). The energy Eg(t) is
stored in the magnetizing inductance LM. The rectifying diode
D1 is reverse biased and the load current IO is supplied by
the secondary capacitor CO. When Q1 turns off, D1 conducts
and the stored energy Eg(t) is delivered to the output.
N
ot
R
ec
om
Power supply for the controller during normal operation. The
controller will start up when VCC reaches 12 V (typical) and
will shut-down when the VCC voltage is 5.5 V (typical). A
decoupling capacitor should be connected between the VCC
pin and GND.
VCC(ST)
Rev. 1.8
iW1690
February 3, 2012
Page 7
iW1690
Low-Power Off-line Digital PWM Controller
+
ig(t)
id(t)
N:1
D1
vg(t)
vin(t)
VO
+
CO
VAUX = VO x
IO
VAUX
VAUX
0V
Figure 9.3.1 Simplified Flyback Converter
dt
=
vg (t )
(9.1)
LM
vg (t ) × tON
(9.2)
LM
LM
E
=
× ig _ peak (t ) 2
g
2
m
en
This current represents a stored energy of:
de
ig _ peak (t ) =
(9.3)
ec
om
When Q1 turns off at tO, ig(t) in LM forces a reversal of
polarities on all windings. Ignoring the communication-time
caused by the leakage inductance LK at the instant of turn-off
tO, the primary current transfers to the secondary at a peak
amplitude of:
NP
× ig _ peak (t )
NS
R
id =
(t )
(9.4)
N
ot
Assuming the secondary winding is master, the auxiliary
winding is slave.
Rev. 1.8
NP
ew
Figure 9.3.2 Auxiliary Voltage Waveforms
The auxiliary voltage is given by:
N AUX
(VO + ∆V )
NS
N
=
VAUX
(9.5)
and reflects the output voltage as shown in Figure 9.3.2.
The voltage at the load differs from the secondary voltage by
a diode drop and IR losses. The diode drop is a function of
current, as are IR losses. Thus, if the secondary voltage is
always read at a constant secondary current, the difference
between the output voltage and the secondary voltage will
be a fixed ΔV. Furthermore, if the voltage can be read when
the secondary current is small, ΔV will also be small. With
the iW1690, ΔV can be ignored.
d
At the end of on-time, the current has ramped up to:
NAUX
Fo
dig (t )
VAUX = -VIN x
r
In order to tightly regulate the output voltage, the information
about the output voltage and load current needs to be
accurately sensed. In the DCM flyback converter, this
information can be read via the auxiliary winding or the
primary magnetizing inductance (LM). During the Q1 on-time,
the load current is supplied from the output filter capacitor CO.
The voltage across LM is vg(t), assuming the voltage dropped
across Q1 is zero. The current in Q1 ramps up linearly at a
rate of:
D
Q1
NS
es
i
–
TS(t)
NAUX
gn
s
iin(t)
The real-time waveform analyzer in the iW1690 reads
this information cycle by cycle. The part then generates a
feedback voltage VFB. The VFB signal precisely represents
the output voltage under most conditions and is used to
regulate the output voltage.
9.4 Constant Voltage Operation
After soft-start has been completed, the digital control block
measures the output conditions. It determines output power
levels and adjusts the control system to a light load or a
heavy load. If this is in the normal range, the device operates
in the Constant Voltage(CV) mode, and changes the pulse
width (Ton), and off time (Toff) in order to meet the output
voltage regulation requirements. During this mode the PWM
switching frequency is either 45 kHz or 65kHz, depending on
which product option is being used.
If no voltage is detected on VSENSE it is assumed that the
auxiliary winding of the transformer is either open or shorted
and the iW1690 shuts down.
iW1690
February 3, 2012
Page 8
iW1690
Low-Power Off-line Digital PWM Controller
9.8 Internal Loop Compensation
The constant current mode (CC mode) is useful in battery
charging applications. During this mode of operation
the iW1690 will regulate the output current at a constant
maximum level regardless of the output voltage drop, while
avoiding continuous conduction mode.
The iW1690 incorporates an internal Digital Error Amplifier
with no requirement for external loop compensation. For a
typical power supply design, the loop stability is guaranteed
to provide at least 45 degrees of phase margin and –20dB
of gain margin.
To achieve this regulation the iW1690 senses the load
current indirectly through the primary current. The primary
current is detected by the ISENSE pin through a resistor from
the BJT emitter to ground.
9.9 Voltage Protection Functions
es
i
D
ew
r
N
CC mode
Output Voltage
The iW1690 includes functions that protect against input
line undervoltage and overvoltage (UV/OV) and the output
overvoltage (OVP).
The input voltage is monitored by the VIN pin and the output
voltage is monitored by the VSENSE pin. If the voltage at these
pins exceed their undervoltage or overvoltage thresholds the
iW1690 shuts down immediately. However, the IC remains
biased which discharges the VCC supply. Once VCC drops
below the UVLO threshold, the controller resets itself and
then initiates a new soft-start cycle. The controller continues
attempting start-up until the fault condition is removed.
CV mode
VNOM
gn
s
9.5 Constant Current Operation
Figure 9.6.1 Power Envelope
ec
om
The iW1690 normally operates in a fixed frequency PWM
mode when IOUT is greater than approximately 10% of the
specified maximum load current. As the output load IOUT is
reduced, the on-time tON is decreased. At the moment that
the load current drops below 10% of nominal, the controller
transitions to Pulse Frequency Modulation (PFM) mode.
Thereafter, the on-time will be modulated by the line voltage
and the off-time is modulated by the load current. The device
automatically returns to PWM mode when the load current
increases.
9.7 Variable Frequency Operation
R
Peak-current limit (PCL), over-current protection (OCP) and
sense-resistor short protection (SRSP) are features built-in to
the iW1690. With the ISENSE pin the iW1690 is able to monitor
the primary peak current. This allows for cycle by cycle peak
current control and limit. When the primary peak current
multiplied by the ISENSE sense resistor is greater than 1.2 V an
over current (OCP) is detected and the IC will immediately
turn off the base drive until the next cycle. The OCP is not
a latched shutdown. The base drive will send out switching
pulse in the next cycle, and the switching pulse will continue
if the OCP threshold is not reached; or, the switching pulse
will shut down again if the OCP threshold is still reached.
d
m
en
9.6 PFM Mode at Light Load
de
Output Current
IOUT(CC)
Fo
9.10 PCL, OC and SRS Protection
N
ot
At each of the switching cycles, the falling edge of VSENSE
will be checked. If the falling edge of VSENSE is not detected,
the off-time will be extended until the falling edge of VSENSE
is detected. The maximum switching period is seen at 75
µs. When the switching period reaches 75 µs, the iW1690
immediately shuts off. This avoids operating at continuous
conduction mode.
If the ISENSE sense resistor is shorted there is a potential
danger of the over current condition not being detected.
Thus the IC is designed to detect this sense-resistor-short
fault after the start up, and shutdown immediately. Similar to
the OVP shutdown, the VCC will be discharged since the IC
remains biased. Once VCC drops below the UVLO threshold,
the controller resets itself and then initiates a new soft-start
cycle. The controller continues attempting start-up, but does
not fully start-up until the fault condition is removed.
Rev. 1.8
iW1690
February 3, 2012
Page 9
iW1690
Low-Power Off-line Digital PWM Controller
9.12 Dynamic Base Current Control
1V
RBC
gn
s
es
i
D
(9.6)
m
en
de
d
I BC _ REF =
Where KBC is dynamically changed by the digital control
block: the heavier the load is, the higher KBC becomes.
The minimum KBC is limited to 10, and the maximum KBC is
limited to 31. Therefore, the maximum IB_OUT is set by (1V/
RBC)*100*31. The range of RBC is 40 kΩ to 100 kΩ. Choosing
different RBC can adjust the maximum IB_OUT for different BJT’s
and/or different power levels. The minimum and maximum
IB_OUT are given by table 9.12.1.
Fo
One important feature of the iW1690 is that it directly drives
a BJT switching device with dynamic base current control
to optimize performance. The reference BJT base current
is adjusted by connecting an external RBC resistor from IBC
to GND, which generates a constant current source with a
value of:
(9.7)
ew
To calculate the amount of cable compensation needed, take
the resistance of the cable and connector and multiplyby the
maximum output current.
I B _ OUT
= I BC _ REF ×100 × K BC
N
The iW1690 incorporates an innovative method to
compensate for any IR drop in the secondary circuitry
including cable and cable connector. A 5 W AC adapter with
5 V DC output has 6% deviation at 1 A load current due to
the drop across the DC cable without cable compensation.
The iW1690 cancels this error by providing a voltage offset
to the feedback signal based on the amount of load current
detected.
IBC_REF is multiplied by 100 times inside the IC and is then
used to control the base current for the BJT drive, IB_OUT,
which is the output IB current at the OUTPUT pin. The IB_OUT
is dynamically controlled according to the power supply load
change, as:
r
9.11 Cable Drop Compensation
IBC_REF
IB_OUT
IBC_REF
IB_OUT
0.025
25
0.01
10
mA
31
0.025
77.5
0.01
31
mA
KBC
RBC = 100 kW
Units
Table 9.12.1
N
ot
R
ec
Maximum
10
om
Minimum
RBC = 40 kW
Rev. 1.8
iW1690
February 3, 2012
Page 10
iW1690
Low-Power Off-line Digital PWM Controller
8-Lead Small Outline (SOIC) Package
H
e
h x 45°
A1
A2
B
1.75
A1
0.0040
0.010
0.10
0.25
A2
0.049
0.059
1.25
1.50
B
0.014
0.019
0.35
0.49
C
0.007
0.010
0.19
0.25
D
0.189
0.197
4.80
5.00
E
0.150
0.157
3.80
4.00
e
A
SEATING
PLANE
L
α
C
0.050 BSC
MAX
1.27 BSC
H
0.228
0.244
5.80
6.20
h
0.10
0.020
0.25
0.50
L
0.016
0.049
0.4
1.25
α
0°
8°
r
COPLANARITY
0.10 (0.004)
1.35
es
i
4
MIN
0.069
D
1
MAX
0.053
Millimeters
ew
5
MIN
A
N
E
8
Inches
Symbol
D
gn
s
10.0 Physical Dimensions
Fo
Figure 10.0.1. Physical dimensions, 8-lead SOIC package
Compliant to JEDEC Standard MS12F
d
Controlling dimensions are in inches; millimeter dimensions are for reference only
de
This product is RoHS compliant and Halide free.
m
en
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.
N
ot
R
ec
om
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.
Rev. 1.8
iW1690
February 3, 2012
Page 11
iW1690
Low-Power Off-line Digital PWM Controller
gn
s
11.0 Ordering Information
Part Number
Options
Package
Description
iW1690-00
fSW = 65 kHz, Cable Comp = 0 mV
SOIC-8
Tape & Reel2
iW1690-02
fSW = 45 kHz, Cable Comp = 150 mV, No OVDC1
SOIC-8
iW1690-03
fSW = 45 kHz, Cable Comp = 412 mV, No OVDC1
iW1690-05
fSW = 65 kHz, Cable Comp = 337 mV
iW1690-07
fSW = 75 kHz, Cable Comp = 0 mV
iW1690-08
fSW = 45 kHz, Cable Comp = 337 mV
iW1690-09
fSW = 45 kHz, Cable Comp = 0 mV, No OVDC1
es
i
Tape & Reel2
SOIC-8
Tape & Reel2
SOIC-8
Tape & Reel2
SOIC-8
Tape & Reel2
SOIC-8
Tape & Reel2
ew
D
SOIC-8
N
Note 1: No input over-voltage shutdown.
Tape & Reel2
N
ot
R
ec
om
m
en
de
d
Fo
r
Note 2: Product is provided on 13” reels, 2,500 per reel. Minimum ordering quantity is 2,500. This product is
RoHS compliant and Halide free.
Rev. 1.8
iW1690
February 3, 2012
Page 12
iW1690
Low-Power Off-line Digital PWM Controller
About iWatt
gn
s
iWatt Inc. is a fabless semiconductor company that develops intelligent power management ICs for computer, communication,
and consumer markets. The company’s patented pulseTrain™ technology, the industry’s first truly digital approach to power
system regulation, is revolutionizing power supply design.
es
i
Trademark Information
© 2012 iWatt, Inc. All rights reserved. iWatt, EZ-EMI, and pulseTrain are trademarks of iWatt, Inc. All other trademarks and
registered trademarks are the property of their respective companies.
D
Contact Information
ew
Web: https://www.iwatt.com
E-mail: [email protected]
r
Fo
Disclaimer
N
Phone: 408-374-4200
Fax: 408-341-0455
iWatt Inc.
675 Campbell Technology Parkway, Suite 150
Campbell, CA 95008
de
d
iWatt reserves the right to make changes to its products and to discontinue products without notice. The applications
information, schematic diagrams, and other reference information included herein is provided as a design aid only and are
therefore provided as-is. iWatt makes no warranties with respect to this information and disclaims any implied warranties of
merchantability or non-infringement of third-party intellectual property rights.
m
en
iWatt cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an iWatt product. No
circuit patent licenses are implied.
Certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property
or environmental damage (“Critical Applications”).
om
IWATT SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO
BE SUITABLE FOR USE IN LIFE‑SUPPORT APPLICATIONS, DEVICES OR SYSTEMS, OR OTHER CRITICAL
APPLICATIONS.
ec
Inclusion of iWatt products in critical applications is understood to be fully at the risk of the customer. Questions concerning
potential risk applications should be directed to iWatt, Inc.
N
ot
R
iWatt semiconductors are typically used in power supplies in which high voltages are present during operation. High-voltage
safety precautions should be observed in design and operation to minimize the chance of injury.
Rev. 1.8
iW1690
February 3, 2012
Page 13