Datasheet

Advance Data Sheet: iAF Series – Non-isolated SMT Power Module
©2011 TDK Innoveta Inc.
iAF12_Full_Datasheet_10032012.doc 10/3/2012
℡
(877) 498
-
0099
15/18
Operating Information:
Over-Current Protection: The power modules have
short circuit protection to protect the module during
severe overload conditions. During overload
conditions, the power modules may protect
themselves by entering a hiccup current limit mode.
The modules will operate normally once the output
current returns to the specified operating range. Long
term operation outside the rated conditions and prior
to the hiccup protection engaging is not recommended
unless measures are taken to ensure the module’s
thermal limits are being observed.
Remote On/Off: - The power modules have an
internal remote on/off circuit. The user must supply
compatible switch between the GND pin and the on/off
pin. The maximum voltage generated by the power
module at the on/off terminal is Vin,max. The
maximum allowable leakage current of the switch is
10uA. The switch must be capable of maintaining a
low signal Von/off < 0.5V while sinking 1mA.
The standard on/off logic is positive logic. In the
circuit configuration shown the power module will turn
off if the external switch is on and it will be on if the
switch is off and the on/off pin is pulled up to Vin by an
external 20K ohm resistor. If the positive logic feature
is not being used, terminal 1 should be left open.
GND
On/ Off
Vin (+)
Rpullup
On/Off Circuit for positive logic
An optional negative logic is available. In the circuit
configuration shown the power module will turn on if
the external switch is on and it will be off if the on/off
pin is pulled up to Vin by an external 20K ohm
resistor. If the negative logic feature is not being
used, terminal 1 should be left open.
GND
On/ Off
Vin (+)
Rpullup
On/Off Circuit for negative logic
Remote Sense: The power modules feature positive
remote sense to compensate for the effect of output
distribution drops. The output voltage sense range
defines the maximum voltage allowed between the
output power terminals and output sense terminals,
and it is found on the electrical data page for the
power module of interest. If the positive remote sense
feature is not being used, the Sense terminal should
be connected to the Vo terminal.
The output voltage at the Vo terminal can be
increased by either the remote sense or the output
voltage adjustment feature. The maximum voltage
increase allowed is the larger of the remote sense
range or the output voltage adjustment range; it is not
the sum of both. As the output voltage increases due
to the use of the remote sense, the maximum output
current may need to be decreased for the power
module to remain below its maximum power rating.
The negative remote sense terminal is not internally
connected. This feature is not currently available on
this product series.
Synchronization:
The synchronization terminal is not internally
connected. This feature is not currently available on
this product series.
Power Good: The power module features an open-
drain power good signal which indicates if the output
voltage is being regulated. When power is applied to
the module, but the output voltage is more than +/-
12% from the nominal voltage set point due to input
under voltage, over temperature, over load, or loss of
control the power good will be pulled to ground
through a 50 ohm maximum impedance. The
maximum leakage current of the power good pin is
15uA. The voltage on the power good pin should be
limited to less than 5.5V in all cases. If the power
good feature is not used, the pin should be left open.