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IW2202 fiches techniques PDF

iWatt Corporation - Digital SMPS Controller

Numéro de référence IW2202
Description Digital SMPS Controller
Fabricant iWatt Corporation 
Logo iWatt Corporation 





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IW2202 fiche technique
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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
Page 1
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