MKW5000 Series
Output Volta ge Trim
Te s t Configura tions
Output voltage trim allows the user to increase or
decrease the output voltage set point of a module.
The output voltage can be adjusted by placing an external
resistor (Radj) between the Trim and + Vout or - Vout
terminals. By adjusting Radj, the output voltage can be
change by { 10% of the nominal output voltage.
Input Re fle cte d- Ripple Curre nt Te s t S e tup
To Oscilloscope
+Vin
+Out
+
+
Lin
DC / DC
Converter
Current
Probe
Load
Battery
Cin
-Vin
-Out
+Out
+Vin
10K
Trim Down
-Vin
-Out
Trim
Input reflected- ripple current is measured with a inductor
Lin (4.7uH) and Cin (220uF, ESR < 1.0[ at 100 KHz) to
simulate source impedance.
Trim
Up/Down
Trim Up
Enable
Capacitor Cin, offsets possible battery impedance.
Current ripple is measured at the input terminals of the
module, measurement bandwidth is 0- 500 KHz.
A 10K, 1 or 10 Turn trimpot is usually specified for
continuous trimming. Trim pin may be safely left floating if it
is not used.
Connecting the external resistor (Radj- up) between the
Trim and - Vout pins increases the output voltage to set the
point as defined in the following equation:
P e a k- to- P e a k Output Nois e Me a s ure me nt Te s t
Us e a Cout 1.0uF ceramic capacitor.
Scope measurement should be made by using a BNC
socket, measurement bandwidth is 0- 20 MHz. Position the
load between 50 mm and 75 mm from the DC/DC Converter.
(33* Vout)- (30* Vadj)
Radj- up =
Vadj - Vout
+Vin
+Out
Copper Strip
Cout
Connecting the external resistor (Radj- down) between
the Trim and + Vout pins decreases the output voltage set
point as defined in the following equation:
Single Output
DC / DC
Resistive
Load
Scope
Converter
-Vin
-Out
(36.667* Vadj) - (33* Vout)
Radj- down =
V out- Vadj
Copper Strip
Cout
+Vin
+Out
Com.
-Out
Vout : Nominal Output Voltage
Vadj : Adjusted Output voltage
Scope
Scope
Dual Output
DC / DC
Converter
Resistive
Load
Unit
: VDC/ K[
Cout
-Vin
Ove rcurre nt P rote ction
To provide protection in a fault (output overload)
condition, the unit is equipped with internal current limiting
circuitry and can endure current limiting for an unlimited
duration. At the point of current- limit inception, the unit shifts
from voltage control to current control. The unit operates
normally once the output current is brought back into its
specified range.
De s ign & Fe a ture Cons ide ra tions
Re mote On/Off
Positive logic remote on/off turns the module on during a
logic high voltage on the remote on/off pin, and off during a
logic low.
To turn the power module on and off, the user must
supply a switch to control the voltage between the on/off
terminal and the - Vin terminal.
Output Ove rvolta ge P rote ction
The output overvoltage clamp consists of control circuitry,
which is independent of the primary regulation loop, that
monitors the voltage on the output terminals.
The control loop of the clamp has a higher voltage set
point than the primary loop.
The switch can be an open collector or equivalent.
A logic low is - 0.7V to 1.0V.
A logic high is 2.5V to 100V.
The maximum sink current at the on/off terminal (Pin 3)
during a logic low is 100 mA.
This provides a redundant voltage control that reduces
the risk of output overvoltage.
The maximum allowable leakage current of a switch
connected to the on/off terminal (Pin 3) at logic hight (2.5V to
100V) is 5uA.
The OVP level can be found in the output data .
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