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IPS20 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part # IPS20
Description  Precision Feedback Controllers Fixed and PTAT references
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IPS20 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

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Power Management IPS20 and IPS21
© Copyright 2006-2009 - ASIC Advantage, Inc.
AADS00001/AA743
- Revision 5– Dec 2008
4 / 12
IN-PLUG® IPS20 and IPS21
FUNCTIONAL DESCRIPTION
IPS20 and IPS21 are highly integrated feedback solutions for Switch Mode Power Supplies applications requiring
constant voltage and constant current mode. They were especially designed to reduce the power dissipated in the
load-side current sensing resistor of power supplies with high output current They provide precise voltage and
current regulation that can be fully and independently adjusted. They source the current necessary to drive a ground-
referred optocoupler connected to the line side controller.
They both incorporate the same trimmed temperature compensated 1.2V reference to set the output voltage. They
only differ by the characteristics of the current sensing references. The IPS20 features a trimmed 50mV reference
with a positive temperature coefficient which closely matches that of a PCB copper trace. This copper trace sensing
method can be used inexpensively with very low associated power losses. The IPS21 incorporates a constant 100mV
reference for more conventional resistors.
Both the output voltage and current sense can be independently adjusted through respectively RV1/RV2 and
RISENSE (FIG.1) This information is presented to the IPS20/21 controller, which drives the optocoupler through the
OPTO current-mode output pin.
The shunt regulator operates like a zener diode, keeping the chip supply voltage at about 4 volts. At start-up, when
the 4 volts are reached, the controller starts normal operation. The overall chip consumption in this case is about 600
μA.
If the IPS20 or IPS21 Vcc is connected to the converter output voltage, then under start-up or short-circuit
conditions, the IPS20/21 isn’t supplied with a high enough voltage. This is due to the fact that the chip has its power
supply line in common with the power supply line of the system. Therefore, the current limitation can only be
ensured by the primary PWM module, that should be chosen accordingly.
If the primary current limitation is considered not to be precise enough for the application, then a sufficient supply
for the IPS20/21 has to be ensured under any condition. It would then be necessary to add some circuitry to supply
the chip with a separate power line.
The schematic in Figure 3 below shows how to realize a low-cost power supply for the IPS20/21 (with no additional
winding). Please pay attention to the fact that in the particular case presented here, this low-cost power supply can
reach voltages as high as twice the voltage of the regulated line.
FIG.2 OUTPUT VOLTAGE VERSUS OUTPUT
CURRENT


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