MIW5000 Series
control to current control. The unit operates normally once the
output current is brought back into its specified range.
Test Configurations
Input Reflected-Ripple Current Test Setup
Overvoltage Protection
Input reflected-ripple current is measured with a inductor
Lin (4.7uH) and Cin (220uF, ESR < 1.0[ at 100 kHz) to
simulated source impedance.
Capacitor Cin, offsets possible battery impedance.
Current ripple is measured at the input terminals of the
module, measurement bandwidth is 0-500KHz.
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.
This provides a redundant voltage control that reduces the
risk of output overvoltage.
To Oscilloscope
+Vin
+Out
Input Source Impedance
+
+
Lin
DC / DC
Converter
Current
Probe
Load
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power module.
In applications where power is supplied over long lines and
output loading is high, it may be necessary to use a capacitor
on the input to insure startup.
Battery
Cin
-Vin
-Out
Peak-to-Peak Output Noise Measurement Test
By using a good quality low Equivalent Series Resistance
(ESR < 1.0[ at 100 kHz) capacitor of a 12uF for the 12V,
4.7uF for the 24V input devices and a 2.2uF for the 48V
devices, capacitor mounted close to the power module helps
ensure stability of the unit.
Use a Cout 0.47uF 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.
+Vin
+Out
Copper Strip
Cout
+
+Vin
DC / DC
+Out
Single Output
DC / DC
+
Resistive
Load
DC Power
Source
Scope
Load
Converter
Converter
Cin
-
-Vin
-Out
-Vin
-Out
Copper Strip
Cout
+Vin
+Out
Com.
-Out
Scope
Scope
Output Ripple Reduction
Dual Output
DC / DC
Resistive
Load
Converter
A good quality low ESR capacitor placed as close as
practicable across the load will give the best ripple and noise
performance.
Cout
-Vin
To reduce output ripple, it is recommended that 3.3uF
capacitors are used on output.
Design & Feature Considerations
Maximum Capacitive Load
+
+Vin
+Out
-Out
Single Output
DC / DC
DC Power
Source
Converter
The MIW5000 series has limitation of maximum connected
capacitance on the output.
The power module may operate in current limiting mode
during start-up, affecting the ramp-up and the startup time.
The maximum capacitance can be found in the data sheet.
Cout
Load
-
-Vin
+
+Vin
+Out
Dual Output
Overcurrent Protection
Cout
Load
DC Power
Source
DC / DC Com.
Converter
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
-
-Vin
-Out
REV:0 2005/04
MINMAX
6
MINMAX [ MINMAX TECHNOLOGY CO., LTD. ]
