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IW2202 の電気的特性と機能

IW2202のメーカーはiWatt Corporationです、この部品の機能は「Digital SMPS Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 IW2202
部品説明 Digital SMPS Controller
メーカ iWatt Corporation
ロゴ iWatt Corporation ロゴ 




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IW2202 Datasheet, IW2202 PDF,ピン配置, 機能
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iW2202
Digital SMPS Controller
Preliminary Data
1 Application
4 Description
Blue-Angel-compliant PFC-controlled switch-mode
power supplies up to 150 watts.
2 Features
§ PulseTrainregulation allows voltage, current
and PFC to be controlled independently
§ Primary-only feedback eliminates optoisolators
and simplifies design
§ No loop compensation components required
§ ±1% regulation over a 100:1 load variation
§ Built-in soft-start
§ Adaptive pulseTrain regulation keeps the bulk
capacitor voltage below 400V
§ Operates in critical discontinuous conduction
mode (CDCM)
§ Low start-up and supply current
§ Reduced EMI noise
§ SO-8 package
3 Benefits
§ Ideal for single-stage, single-switch power factor
correction (PFC)
§ Enables 97% power factor correction resulting in
EN6100-3-2 compliance
§ SmartSkip mode provides low standby dissipation
of the power supply enabling Blue Angel
Compliance
§ Efficiency greater than 85% across line and load
variation
§ Universal input (85-270V, 50-60 Hz)
§ Low parts count
§ Reduced design time due to the elimination of
loop compensation design
The iW2202 is a digital switching mode power supply
controller for PFC applications. Its is typically used
with the PFC-corrected BIFRED (Boost Integrated with
Flyback Rectifier/Energy storage DC/DC) topology,
shown in Figure 1. The BIFRED topology is a single-
stage, single-switch topology that combines a boost
converter with an isolated flyback converter, achieving
power-factor correction with a low parts count.
An iW2202-based power supply looks like a resistor to
the AC line. Unlike attempts to control the BIFRED
topology with analog controllers, the all-digital
iW2202 provides a near-unity power factor without
placing high voltage stresses on the bulk capacitor.
The iW2202 uses a proprietary new digital control
technology called pulseTrainto achieve efficiencies
in excess of 85% across a wide load range, and across
the universal input range of 85-270VAC, 50-60 Hz.
Internally, the iW2202 uses real-time waveform analysis
to determine crucial circuit parameters. The reflected
secondary voltage of the flyback transformer is sensed
at precisely calculated times to determine the
secondary voltage, the transformer reset time, and the
ideal zero-voltage switching point Measurements are
performed during the OFF time of every cycle, and the
results determine what is done on the next cycle. The
dynamic response time of the circuit is less than half a
cycle.
85-270 V,
50-60 Hz
AC
Input
Boost Inductor
Auxiliary
Winding
Switch
iW2202
Flyback
Winding
Output
+ Vout
Current
Sense
Boost
(Bulk)
Capacitor
GND
Figure 1. iW2202 system concept
Revision 1.1
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1 Page





IW2202 pdf, ピン配列
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iW2202 Data Sheet
Preliminary Data
7 Electrical Characteristics
Unless otherwise specified, these specifications apply for VCC = 12V, TA 70 °C. (See Note 1.)
Symbol Parameter
Test Conditions
Min Typ Max Units
FEEDBACK / AUXILIARY / PFC SECTION (Pins 2, 3, and 4)
VIR
IIR
VREF
Input voltage range
Input current range
Internal voltage reference (Note 2)
0
1.182
5
0.1 1
1.2 1.218
V
µA
V
ISENSE SECTION (Pin 5)
ISENSE buffer gain
Input voltage
Input current
VSD Output shutdown voltage (Note 3)
4.75 5 5.25 V/V
0 5V
0.1 2 µA
1.5 5 V
OUTPUT SECTION (Pin 8)
VOL Output low level
ISINK = 200mA
0.5 1 V
ISINK = 20mA
0.2 0.4 V
VOH Output high level
ISOURCE = 200mA
10 11
V
ISOURCE = 20mA
10 11
V
tR Rise time (Note 4)
TA = 25 °C, CL = 1500pF
30 50 nS
tF Fall time (Note 4)
TA = 25 °C, CL = 1500pF
30 50 nS
tON_MAX Maximum switch ON time (Note 5)
5.1 6 6.9 µS
START-UP SECTION (Pin 1)
VSU Start-up threshold (Note 1)
Min operating voltage after turn-on
13.5 14 14.5 V
9.5 10 10.5 V
SUPPLY VOLTAGE SECTION (Pin 1)
ISU Start-up current
VCC = 13V
0.5 1 mA
ICC Supply current (operating)
10 VCC 13.2
12 mA
VUVP Under-voltage protection
7 7.8 8.6 V
VOVP Over-voltage protection
VSU+1.0
V
Notes:
1. VCC must be brought aboe the start-up threshold before setting to its operating value (nominally 12V).
2. VREF is the internal voltage reference. It is not brought out to a pin.
3. When the voltage on the ISENSE pin exceeds VSD, all gate pulses are suppressed.
4. Not tested, but guaranteed by design.
5. The switch will be turned off after this amount of ON time if IPEAK has not been reached, placing a lower limit on
switching frequency.
Revision 1.1
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IW2202 電子部品, 半導体
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iW2202 Data Sheet
10 PulseTrain Regulation
Rather than using pulse-width or pulse frequency
modulation to achieve output voltage regulation,
pulseTrain controls output voltage through the
presence or absence of power pulses. If the output
voltage is below the desired level, power pulses are
emitted continuously until the desired level is
reached. If the output voltage is higher than the
desired level, sense pulses are sent instead of power
pulses. A sense pulse has a much shorter ON time
than a power pulse, and transfers much less energy.
See Figure 4.
A sense cycle has the same period as the preceding
power cycle, but the ON time is set to one-fourth
that of the power cycle. Since primary current ramps
linearly with ON time, the peak current of a sense
pulse is also only one-fourth that of a power pulse.
Thus, a sense cycle only transfers one-sixteenth as
much energy as a power cycle.
Under most load conditions, regulation is achieved
through a mix of power cycles and sense cycles.
Under extremely low-load conditions, no power
pulses are sent. Instead, sense cycles alternate with
skip cycles.
Preliminary Data
It is important to recognize that pulseTrain does not
depend on the precise width of the pulses to
maintain regulation. If the output voltage is lower
than the desired level, the next cycle will contain a
power pulse. If the output voltage is above the
desired limit, the next cycle will contain a sense
pulse. The pulseTrain controller will optimize the
ratio of power pulses to sense pulses to keep the
output voltage constant. The frequency and duty
cycle of the pulses can change, but this does not
affect voltage regulation.
This situation is very different from the situation
with analog technologies, such as PWM/PFM-based
controllers, which are forced to attempt to meet all
their goals through the adjustment of pulse
geometry, which forces unwanted trade-offs.
As will be shown in the next section, pulseTrain
modulation takes full advantage of its ability to
pursue multiple simultaneous goals, combining the
flexibility of pulseTrain regulation with the
precision of real-time waveform analysis, resulting
in ultra-fast dynamic response and simplified circuit
design.
11 Real-Time Waveform Analysis
Figure 5 shows the effect of a sense pulse on the
transformer’s primary winding, measured at Vdrain.
As you can see, this waveform contains quite a bit of
ringing. This ringing is highly organized, consistent
from cycle to cycle, and its onset pinpoints
important events in the cycle.
In a flyback system, the reflected voltage seen
during the switch’s OFF time reveals the secondary
voltage, plus additional circuit information,
including leakage inductance, transformer reset
time, resonant frequency, and secondary diode
characteristics. All this information is easily read on
an auxiliary winding. This information renders
secondary feedback unnecessary.
The choice between reading the reflected voltage on
the primary winding or on an auxiliary winding is
somewhat arbitrary. If taken from the primary, the
voltage centers around Vin (the instantaneous line
voltage). If taken from an auxiliary winding, the
voltage centers around zero. The auxiliary winding
can also provide power for the device.
Real-time waveform analysis uses the information in
the reflected voltage to extract secondary voltage
and transformer reset time. These voltage
measurements are made on every cycle, and each
cycle’s measurement determines the next cycle’s
pulse type.
Traditional voltage regulators use space-average
sensing, averaging the voltage over multiple cycles.
This causes the loss of a great deal of information
and introduces delays, slowing the response of the
controller and raising the issue of loop instability.
Real-time waveform analysis, on the other hand,
does not perform averaging, but determines the next
cycle’s switching decisions from the current cycle
alone. The time delay between measurement and
correction (dynamic response) is thus extremely
short, being less than the OFF time of a single cycle.
The system is inherently stable. There is no need for
loop compensation.
Revision 1.1
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部品番号部品説明メーカ
IW2202

Digital SMPS Controller

iWatt Corporation
iWatt Corporation


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