LAB105 Technology Co., Ltd -- PPS033B BIAS-Tee Power Adapter
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Home > English > Product > Power Sources & Supplies > DC BIAS Source
PPS033B BIAS-Tee Power Adapter

DC BIAS Source
PPS033B
BIAS-Tee Power
Adapter
Description
The BIAS-Tee power adapter taps power from USB port (through type-B connector). The adapter then regulates the tapped power to 3.3V then outputs it to 4 SMA connectors. The adapter can be turn on and off by pressing a toggle switch next to the type-B connector.
For power rating protection, these are the characteristic



The adapter performs no USB enumeration function, the maximum current drawn from USB is 100mA. Excessive of 100mA draw by external load is limited by USB port.
The adapter limits the current at 250mA by itself, this is a redundant function to host USB powering function.
The adapter performs thermal shutdown when power regulator junction temperature reach 150°C.
Electric characteristic
Current draws
State Values Notes
Adapter When connected
to the USB port		 2mA ( General value )，
Quiescent current
Adapter Standby 8mA ( MAX ) Green LED indicates the current
consumed with the line

Inrush current cause by hot insertion and voltage sag
USB specification request that the voltage of USB power bus may drop when hot inserting an USB device, the maximum USB power bus voltage drop need to be less than 330mV measured at the USB connector.

When first-time plug in (all BIAS-Tee capacitors fully discharged)
USB plug in, current profile, measured the voltage drop across a 5-ohm sense resistor. The following waveform had shown the instantaneous inrush current reach to 560mA approximately. The USB 2.0 allows inrush current to 1.5-Amp before triggering the power protection mechanism.
When first-time plug in (detail of time distribution)
The peak current occurs within the first 40-us duration then decline to 2V level which is 400mA for 1ms. Afterward further decline to 100mA for 10ms and then down to 2mA.
When power on and in stand-by mode (with no external load)
While toggle switch pressed and entering in stand-by mode, the inrush current profile is as the waveform shown below. Where the maximum current reach to 52mA and last for 5ms approximately. This amount of inrush current is least likely to cause USB bus voltage sag.
Power-on while load=80ma
Noise immunization
Noise profile
The following trace illustrates the spectrum noise distribution ranged from 5MHz to 65MHz. Notice at 25MHz the highest detectable peak is -74dBm.
Ordering Information
PPS033B BIAS-Tee Power Adapter


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