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| 型号： | HKS48T30120-PCA0 |
| 厂商： | Power-One |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | DC/DC HALF BRICK 20V 0UT 48V IN |
| 标准包装： | 50 |
| 系列： | * |
HKS48T30120 DC-DC Series Data Sheet
Half-Brick with 48VDC Input; 12VDC @ 32A Output
Noise Measurement Methods
To improve the accuracy and repeatability of ripple
and noise measurements, Power-One utilizes the
test setups shown in Figure 9 & 10 below.
COPPER STRIPS (2 to 3 inches)
DUT
+Vo1
Overcurrent Protection
To provide protection from an output overload or short
circuit condition, the HKS is equipped with current
limiting circuitry and can endure the fault condition for
an unlimited duration. At the point of current-limit
inception, the converter enters hiccup mode, causing
the output current to be limited in both peak and
duration. While in the hiccup mode, the converter
attempts to restart approximately once every 150 ms
1uF
ceramic
10uF
Tantalum
SCOPE
LOAD1
as shown in Figure 11. Because of very low duty
cycle the RMS value of output current is limited to
-Vo1
Figure 9. Output Ripple and Noise Measurement Test Setup
A BNC connector is used for measurements to
eliminate noise pickup associated with long ground
leads of conventional scope probes. The connector,
a 0.1 μ F ceramic, a 10 μ F tantalum capacitor, and
the load are located 2-3” away from the converter.
For output decoupling, we recommend using a 10 μ F
low ESR tantalum (AVX TPSC106M025R0500 is
used in Power-One test setup) and a 0.1 μ F ceramic
capacitor. Note that the capacitors do not substitute
for filtering required by the load.
TO OSCILLOSCOPE
only 8 A RMS max..
Figure 11. Short Circuit Behavior (typ)
Condition: Vin = 75 VDC
Cs 220 uF
Ltest
12 uH
220 uF
Vi(+)
Channel 1 - Short circuit current, 6.22A RMS (measured)
Scale: 20 Amperes/division.
BATTERY
ESR < 0.1 OHM
ESR < 0.1 OHM
@ 20 oC, 100 kHz
@ 20 oC, 100 kHz
Once the output current is brought back into its
Vi(-)
Figure 10. Input Reflected Ripple Current Measurement Setup
Note: Measure input reflected-ripple current with a simulated
inductance (Ltest) of 12 μH. Capacitors offset possible battery
impedance. Measure current as shown above
specified range, the converter automatically exits the
hiccup mode and continues normal operation.
Back Driving
The HKS DC-DC converter uses a control driven
synchronous rectification technique. Applying an
external voltage on the output of a unit that is shut
down will not cause damage.
FEB 14, 2006 revised to MAY 17, 2006
Page 8 of 14
www.power-one.com
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