NCV7361A ON Semiconductor, NCV7361A Datasheet - Page 23

• Manufacturer Part Number: NCV7361A
• Description: Voltage Regulator
• Manufacturer: ON Semiconductor

Capacity Value
dependence from the voltage, temperature and the
frequency. The temperature coefficient of the capacity
value is positive, that means that the value increases with
increasing of the temperature. The capacity value
decreases with increasing of the frequency. This behavior
of a capacitor can cause that at T
value falls below the minimum required capacity for the
regulator. In this case the regulator becomes instable,
which means the regulator starts oscillation. The nominal
value of the capacitor at T
enough margin under consideration of the capacitor
specification. The instable behavior will be amplified
because of the decreasing of the capacity with this
oscillation.
ESR
the equivalent circuit diagram of a capacitor. The ESR
value is dependent from the temperature and frequency.
EMI Suppressing
220 pF capacitor should be directly connected to the BUS
pin (see Figure 36).
of the LIN network. 220 pF should be used for bigger
networks. Values from 333 pF up to 1.0 nF should be used
for middle to small LIN networks. Finally the size of the
The capacity value of an electrolytic capacitor is
The Equivalent Serial Resistance is the resistor part of
To minimize the influence of EMI from the bus line, a
The value of the filter capacity can be adjusted to the size
LIN−BUS
V
BAT
Protection−Diode
RC−Filter
Reverse
100 mF
10
A
= 25 C has to be chosen with
+
100 p
A
Optional
= −40 C the capacity
Figure 36. Application Circuit (Slave Node)
or
220 pF
100 nF
LC−Filter
33 mH
http://onsemi.com
V
EN
GND
BUS
SUP
NCV7361A
NCV7361A
82p
23
10 mF...100 mF
Normally the specified ESR values for a capacitor is valid
at a temperature of T
f = 100 kHz.
with increasing of the temperature the ESR value
decreases. In the choice of the capacity has to be taken into
account that the ESR can decrease at T
dramatically that the valid operating area can be left, which
causes that the regulator will be instable.
Tantalum Capacitors
capacity and the ESR from the temperature and is therefore
well suitable as V
Aluminum Capacitors
and the ESR from the temperature. These characteristic
restrains the usability as load capacity for the low drop
regulator of NCV7361A.
filter capacitor influences the effectiveness of the EMI
suppressing in conformance to the maximum LIN bus
capacity of 10 nF.
C, L or R, depends on the corner frequency, the maximum
LIN bus capacity (10 nF) and the compliance with the DC−
and AC LIN bus parameters.
RESET
The temperature coefficient is negative, which means
This type of capacitor has a low dependence of the
These capacitors show a strong influence of the capacity
LC−filters or RC−filters can also be used. The value of
V
RxD
TxD
OUT
+
OUT
100 nF
load capacity.
A
+5 V
= 25 C and a frequency of
mC
A
= −40 C