IW1810 Datasheet, PDF (1/13 Pages) Dialog Semiconductor – Off-Line Digital Green-Mode PWM Controller Integrated

iW1810
Off-Line Digital Green-Mode PWM Controller
Integrated with Power BJT
1.0 Features
●● Primary-side feedback eliminates opto-isolators and
simplifies design
●● Internal 800-V bipolar junction transistor (BJT)
●● 64kHz PWM switching frequency
●● No-load power consumption < 100mW at 230V_ac with
typical application circuit
●● Adaptive multi-mode PWM/PFM control improves
efficiency
●● Quasi-resonant operation for highest overall efficiency
●● EZ-EMI^® design to easily meet global EMI standards
●● Dynamic BJT base drive current control
●● Very tight constant voltage and constant current
regulation with primary-side-only feedback
●● No external compensation components required
●● Complies with EPA 2.0 energy-efficiency specifications
with ample margin
●● Low start-up current (8μA typical)
●● 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
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2.0 Description
The iW1810 is a high performance AC/DC power supply
control device which uses digital control technology to
build peak current mode PWM flyback power supplies.
This device includes an internal 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 iW1810 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.
iWatt’s innovative proprietary technology ensures that
power supplies built with iW1810 can achieve both highest
average efficiency and less than 100 mW no-load power
consumption in a compact form factor.
3.0 Applications
●● Low-power AC/DC power supply for smart meters, motor
control and industrial applications
●● Linear AC/DC replacement
●● Low-power AC/DC LED driver
+
N
+
V_OUT
GND
1C
U1
iW1810
E8
2_C
4 _VCC
I_SENSE 7
V_SENSE 6
GND 5
WARNING:
Figure 3.1: iW1810 Typical Application Circuit
The iW1810 is intended for high voltage AC/DC offline applications. Contact with live high voltage offline circuits
or improper use of components may cause lethal or life threatening injuries or property damage. Only qualified
professionals with safety training and proper precaution should operate with high voltage offline circuits.
Rev. 1.2
iW1810
April 6, 2012

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