E
EJUNGYA
Approved
Ericsson Internal
PRODUCT SPECIFICATION
No.
Checked
Date
4 (5)
Prepared (also subject responsible if other)
2/1301-BMR 636
Technical Specification
01/A4 Uen
2007-5-15
EN/LZT 146
382 R1A June
2007
Rev
Reference
7
PKB
4717 PINB
SEC/D (LINDA ZHONG)
DC/DC converters,
Input
36-75
V, Output
10.5
A/75 W
A
© Ericsson Power Modules AB
7.2 V/10.5 A Typical Characteristics
Start-up
Shut-down
PKB 4717 PINB
Start-up enabled by connecting V
I
at:
T
ref
= +25°C, V
I
= 53 V,
I
O
= 10.5 A resistive load.
Top trace: output voltage (2V/div.).
Bottom trace: input voltage (20V/div.).
Time scale: (5ms/div.).
Shut-down enabled by disconnecting V
I
at:
T
ref
= +25°C, V
I
= 53 V,
I
O
= 10.5 A resistive load.
Top trace: output voltage (2V/div.).
Bottom trace: input voltage (50V/div.).
Time scale: (0.1ms/div.).
Output Ripple & Noise
Output Load Transient Response
Output voltage ripple at:
T
ref
= +25°C, V
I
= 53 V,
I
O
= 10.5 A resistive load.
Trace: output voltage (20mV/div.).
Time scale: (2μs/div.).
Output voltage response to load current step- Top trace: output voltage (200mV/div.).
change (2.5-7.5-2.5 A) at:
Bottom trace: load current (5A/div.).
T
ref
=+25°C, V
I
= 53 V.
Time scale: (0.1ms/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:
⎞
kΩ
⎛
5.11
×
7.2
(
V
out
−
1.225
)
⎟
Radj
= ⎜
⎜
1.225
×
V
−
1.225
×
7.2
−
10.22
⎟
out
⎠
⎝
Output Voltage Adjust Downwards, Decrease:
Active adjust
The output voltage may be adjusted using a voltage applied to the
Vadj pin. This voltage is calculated by using the following equations:
Vdesired
7.2
⎞
V
−
⎛
V
adj
= ⎜
1.225
+
2.45
×
⎟
7.2
⎝
⎠
Example: Upwards => 7.85 V
⎛
5 .11
×
(
2
V
out
−
7.2
)
⎞
kΩ
⎟
Radj
= ⎜
⎜
⎟
7.2
−
V
out
⎝
⎠
7.85
−
7.2
⎞
⎛
⎜
1.225
+
2.45
×
⎟
V = 1.45 V
7.2
⎝
⎠
Example: Upwards =>V
out
= 7.85 Vdc
⎛
5 . 11
×
7 . 2
(
7 . 85
−
1 . 225
)
⎞
−
10 . 22
⎟
kΩ = 296 kΩ
⎜
⎝
1 . 225
×
7 . 85
−
1 . 225
×
7 . 2
⎠
ERICSSON [ ERICSSON ]
