PKF5713R1A Ericsson Microelectronics, PKF5713R1A Datasheet - Page 7

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PKF5713R1A

Manufacturer Part Number
PKF5713R1A
Description
Manufacturer
Ericsson Microelectronics
Datasheet
Output Voltage Adjust (V
Output voltage, V
other external circuitry. If other circuitry is used, the slew rate has to
be limited to maximum 5 V/ms. If pins 8 and 9 are not connected
together the output will decrease to a low value. To increase V
resistor should be connected between pin 8/9 and 17, and to de-
crease V
fig. 3).
To increase output voltage:
R
V
is the desired output voltage.
To decrease output voltage:
R
V
is the desired output voltage.
Current Limiting Protection (I
The output power is limited at loads above the output current
limiting threshold (I
Capacitive Load
The PKF series has no maximum limit for capacitive load on the
output. The power module may operate in current limiting mode
during start-up, affecting the ramp-up and the start-up time. For
optimum start performance we recommend maximum 100 mF/A of
I
EN/LZT 146 127 R1A © Ericsson Microelectronics AB, December 2001
O
ou nom
I
od nom
I
. Connect capacitors at the point of load for best performance.
is the initial output voltage when pin 8 and 9 are connected, V
is the initial output voltage when pin 8 and 9 are connected, V
=3.18× (14.04-V
=11.60× (V
O
a resistor should be connected between pin 8 and 9 (see
O
I
-V
, can be adjusted by using an external resistor or
lim
O
)/(V
), specified as a minimum value.
O
)/(V
O
-10) kW
O
-V
I
adj
) kW
)
lim
)
Figure 2
Figure 3
O
a
O
O
Input and Output Impedance
Both the source impedance of the power feeding and the load im-
pedance will interact with the impedance of the DC/DC power
module.
It is most important to have the ratio between L and C as low as
possible, i.e. a low characteristic impedance, both at the input and
output, as the power modules have a low energy storage capability.
Use an electrolytic capacitor across the input if the source induct-
ance is higher than 10 mH. Their equivalent series resistance togeth-
er with the capacitance acts as a lossless damping filter. Suitable
capacitor values are in the range 10–100 mF.
Synchronization (Sync)
It is possible to synchronize the switching frequency to an external
symmetrical clock signal. The input can be driven by an TTL-
compatible output and referenced to the input pin 17.
*)
Parallel Operation
Paralleling of several converters is easily accomplished by direct
connection of the output voltage terminal pins. The load regula-
tion characteristic is specifically designed for optimum paralleling
performance. Load sharing between converters will be within
±10%. It is recommended not to exceed P
where P
number of paralleled converters, to prevent overloading any of the
converters and thereby decreasing the reliability performance.
Information Ordering
Version
Surface mount
Through hole
High level
Threshold level
Low level
Sink current
Sync. frequency
Rise time <10ns
Characteristics
Information given in this data sheet is believed to be accurate and reliable.
No responsibility is assumed for the consequences of its use nor for any infringement
of patents or other rights of third parties which may result from its use.
No license is granted by implication or otherwise under any patent or patent rights of
Ericsson Microelectronics. These products are sold only according to
Ericsson Microelectronics’ general conditions of sale, unless otherwise confirmed in
writing. Specifications subject to change without notice.
O max
is the maximum converter output power and n the
*)
Part No.
PKF 5713A SI
PKF 5713A PI
520
min
2.2
1.2
0
1.7
typ
O
= n × 0.9 × P
688
max
6.5
2.2
0.4
1.5
O max
kHz
mA
unit
V
V
V
,
7

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