PKM4510EPI Datasheet, PDF (13/37 Pages) Ericsson – 36-75 Vdc DC/DC converter Output up to 20 A/50 W

PKM 4318HE PI Typical Characteristics
Start-Up
Turn-Off
Start-up at Io=20A resistive load at T_Pcb=+25 °C,
Vin=53 V. Start enabled by connecting Vin. Top trace:
input voltage (10 V/div.). Bottom trace: output voltage
(0.5 V/div.). Time scale: 5 ms/div.
Output Ripple
Turn-off at Io=10A resistive load at T_Pcb=+25 °C,
Vin=53 V. Turn-off enabled by disconnecting Vin.
Output voltage (0.5 V/div.). Time scale: 20 µs/div.
Transient
Output voltage ripple (50mV/div.) at T_Pcb=+25 °C, Vin=53 V,
Io=20A resistive load with C=10 µF tantalum and 0.1 µF
ceramic capacitors. Band width=20MHz. Time scale: 2µs / div.
Output voltage response to load current step-change
(5-15-5 A) at T_Pcb=+25 °C, Vin=53 V. Top trace: output
voltage (100mV/div.). Bottom trace:
load current (5 A/div.) Time scale: 0.1 ms/div.
Output Voltage Adjust
The resistor value for an adjusted output voltage is
calculated by using the following equations:
Output Voltage Adjust Upwards, Increase:
R_adj= 5.11 [1.5(100+Δ%) /1.225Δ%- (100+2Δ%) /Δ%­]­ kOhm
Output Voltage Adjust Downwards, Decrease:
R_adj= 5.11 [(100 /Δ%-2)­]­ kOhm
Eg Increase 4% =>V_out = 1.56 V_dc
5.11 [1.5(100+4)/(1.225x4)-(100+2x4)/4]=24.7 kOhm
Eg Decrease 2% =>V_out = 1.47 V_dc
5.11 x(100/2-2)=245.3 kOhm
Output Voltage Adjust
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Output voltage adjust resistor value vs.
percentage change in output voltage.
PKM 4000E PI Datasheet
13
EN/LZT 146 051 R7A © Ericsson Power Modules, February 2007