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11
Technical Specification
EN/LZT 146 420 R3A March 2014
© Ericsson AB
PKB 4000A series Direct Converters
Input 36-72 V, Output up to 30 A / 125 W
5.0V, 25A /125W Typical Characteristics
Start-up
PKB 4111A PI
Shut-down
Start-up enabled by connecting VI at:
TP1 = +25°C, VI = 53 V,
IO = 25 A resistive load.
Top trace: input voltage (20 V/div.).
Bottom trace: output voltage (2 V/div.).
Time scale: (5 ms/div.).
Shut-down enabled by disconnecting VI at:
TP1 = +25°C, VI = 53 V,
IO = 25A resistive load.
Top trace: input voltage (20 V/div.).
Bottom trace: output voltage (2 V/div.).
Time scale: (5 ms/div.).
Output Ripple & Noise
Output Load Transient Response
Output voltage ripple at:
TP1 = +25°C, VI = 53 V,
IO = 25 A resistive load.
Trace: output voltage (20 mV/div.).
Time scale: (2 µs/div.).
Output voltage response to load current step- Top trace: output voltage (100 mV/div.).
change (6.25-18.75-6.25 A) at:
TP1 = +25°C, VI = 53V.
Bottom trace: load current (10 A/div.).
Time scale: (0.2 ms/div.).
Output Voltage Adjust (see operating information)
Passive adjust
Active adjust
The resistor value for an adjusted output voltage is calculated by
using the following equations:
The output voltage may be adjusted using a {current/voltage} applied
to the Vadj pin. This {current/voltage} is calculated by using the
following equations:
Output Voltage Adjust Upwards, Increase:
5.10 × 5.00
(
100 + ∆%
)
510
Vdesired − 5.00
Radj =
−
−10.2 kΩ
V
adj = 1.225 + 2.45 ×
V
1.225 × ∆%
∆%
5.00
Example: Increase 4% =>Vout = 5.2 Vdc
Example: Upwards => 5.30 V
5.10 × 5.00
(
100 + 4
)
510
4
5.30 − 5.00
−
−10.2 kΩ = 404 kΩ
1.225 + 2.45 ×
V = 1.37 V
1.225 × 4
5.00
Output Voltage Adjust Downwards, Decrease:
100
Radj = 5.11×
− 2 kΩ
∆%
ERICSSON [ ERICSSON ]
