E
MICMALE
Approved
Ericsson Internal
PRODUCT SPECIFICATION
No.
4 (10)
Prepared (also subject responsible if other)
2/1301-BMR 628 Uen
Checked
Date
7
Reference
PKD 4000E
SI
series
MPM/BK/P (Natalie Johansson)
DC/DC converters, Input 36-75 V, Output up to
20
A/50 W
(EANDKUL)
2007-04-24
EN/LZT 146
375
R2B
July
2008
Rev
A
© Ericsson Power Modules AB
1.2 V/20 A Typical Characteristics
Start-up
Shut-down
PKD 4218LE SI
Start-up enabled by connecting V
I
at:
T
ref
= +25°C, V
I
= 53 V,
I
O
= 20 A resistive load.
Top trace: output voltage (0.5 V/div).
Bottom trace: intput voltage (50 V/div).
Time scale: 2 ms/div.
Shut-down enabled by disconnecting V
I
at:
T
ref
= +25°C, V
I
= 53 V,
I
O
= 20 A resistive load.
Top trace: output voltage (0.5 V/div).
Bottom trace: input voltage (50 V/div).
Time scale: 2 ms/div.
Output Ripple & Noise
Output Load Transient Response
Output voltage ripple at:
T
ref
= +25°C, V
I
= 53 V,
I
O
= 20 A resistive load.
Trace: output voltage (20mV/div).
Time scale: 2 µs/div.
Output voltage response to load current step- Top trace: output voltage (200mV/div).
change (5-15-5 A}) at:
Bottom trace: load current (10 A/div).
T
ref
=+25°C, V
I
= 53 V.
Time scale: 0.1 ms/div.
Output Voltage Adjust (see operating information)
Passive adjust
The resistor value for an adjusted output voltage is calculated by
using the following equations:
Output Voltage Adjust Upwards, Increase:
R
adj
= 6 / ((V
out
/ 1.2) - 1) - 40 kΩ
Example: Increase 4% =>V
out
= 1.248 Vdc
6 / ((1.248 / 1.2 ) - 1) — 40 = 110 k
Ω
Output Voltage Adjust Downwards, Decrease:
R
adj
= ((15 x V
out
— 7.2) / (1.2 — V
out
)) — 40 kΩ
Example: Decrease 2% =>V
out
= 1.176 Vdc
((15 x 1.176 - 7.2) / (1.2 — 1.176)) — 40 = 395 k
Ω
ERICSSON [ ERICSSON ]
