IN-PLUG® IPS15H Datasheet – Rev.10 – HiccupIfNlyb-aPckLUCoGnt®rolsleerr–iEeassy:OIpPtoSF1ai5lsaHfe Protection
Enhanced Off-line Switcher With Hiccup,
Low Cost, High Efficiency, Low Stand-By Power.
Fail-Safe Protection from Optocoupler Failure
When Combined with Low Power Zener.
– REVISION 10 -
INTRODUCTION
DESCRIPTION
The IN-PLUG® IPS15H is an enhanced off-line
switcher version of the IPS15 that includes the same
FEATURES
•
“Hiccup” version of the IPS15 with overload
protection.
•
Max output power controlled from line-side to
avoid load-side current sensing circuitry and
associated 10% losses.
Fail-safe protection from optocoupler failure
when combined with low-cost low-power zener.
basic features plus offers
a special overload
protection mode called “hiccup” to control the
maximum output power from the line side and
eliminate the current sensing circuitry on the load
side.
•
The original functions of the IPS15 have been
retained. They include soft start, line over-voltage
protection, shunt-regulator, precision oscillator, PWM
with its associated comparator and loop compensation
components as well as all the necessary biasing and
protection circuitry (thermal shutdown, under-voltage,
over-voltage and over-current).
•
•
•
•
Lower quiescent current (max. 50% of the IPS15)
Can drive a large variety of power MOSFETs
Simple, less critical, lower cost transformer.
Wide range PWM for stable operation at any load
and line voltage.
Operates with optocoupler or bias winding for
constant voltage applications: zeners, adjustable
shunt regulator like TL431.
•
The IPS15H “hiccup” circuitry involves a counter and
some other digital blocks. This feature has been added
to avoid delivering a high current to the load in an
overload condition, which may result in damages to
•
EMI reduction in critical applications thanks to:
Adjustable operating frequency.
Separate MOSFET N & P drives
the SMPS, the load or both
.
•
•
•
•
•
Power shut-down for stand-by modes.
Cycle to cycle over-current protection
Under-voltage lock-out
Line over-voltage protection.
External component savings: MOV, X-cap, Y-cap
(Application permitting)
The overload condition is sensed from the line-side by
monitoring the MOSFET current. The MOSFET must
be allowed to operate at maximum current for the
SMPS to properly start and respond to transient
conditions. If the operation at maximum current is too
long, then it is in an overload condition and the circuit
enters "Hiccup Mode". The peak current in the load is
still high in order to be able to return to normal mode,
but the duty cycle is so low that the average current
drops below 100mA therefore allowing the SMPS to
remain overloaded indefinitely without any reliability
or safety concerns.
APPLICATIONS
•
Standby power supplies for TV, VCR and IR
remotely-controlled appliances.
Cordless and feature phones.
•
•
•
•
•
•
Cellular phone chargers.
The IPS15H not only protects against overload
conditions but also avoid the losses involved in the
sensing circuitry which increases the overall SMPS
efficiency by up to 10%. This is significant!
Power tools fast chargers with trickle and on/off.
Laptops and personal digital assistants.
Utility meters.
Replacements for bulky plug-in transformers.
© Copyright 2003-2007 - ASIC Advantage, Inc. – All rights reserved
- Revision 10 – April 02, 2007
1 / 16
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