LED2000PUR STMicroelectronics, LED2000PUR Datasheet - Page 25

• Manufacturer Part Number: LED2000PUR
• Description: LED Lighting Drivers 3.0V to 18V 850kHz 100mV 95mOhm HS
• Manufacturer: STMicroelectronics

Specifications of LED2000PUR

• Rohs: yes
• Input Voltage: 3 V to 18 V
• Operating Frequency: 850 kHz
• Maximum Supply Current: 3 A
• Mounting Style: SMD/SMT
• Package / Case: VFQFPN-8L
• Power Dissipation: 2 W

LED2000
equivalent RMS current is equal to I
are:
Equation 30
and
Equation 31
where V
internal PDMOS. Considering the range D
I
Table 7.
If the selected capacitor is ceramic (so neglecting the ESR contribution), the input voltage
ripple can be calculated as:
Equation 32
RMS
D
D
V
MIN
IN PP
MAX
TAIYO YUDEN
Electrolytic capacitors:
These are widely used due to their low price and their availability in a wide range of
RMS current ratings.
The only drawback is that, considering ripple current rating requirements, they are
physically larger than other capacitors.
Ceramic capacitors:
If available for the required value and voltage rating, these capacitors usually have a
higher RMS current rating for a given physical dimension (due to very low ESR).
The drawback is the considerably high cost.
Tantalum capacitors:
Small tantalum capacitors with very low ESR are becoming more widely available.
However, they can occasionally burn if subjected to very high current during charge.
Therefore, it is suggested to avoid this type of capacitor for the input filter of the device
as they may be stressed by a high surge current when connected to the power supply.
Manufacturer
going through the input capacitor. Capacitors that can be considered are:
MURATA
=
F
=
=
---------------------------------------- -
V
is the free-wheeling diode forward voltage and V
---------------------------------------
V
INMAX
--------------------------- -
C
V
INMIN
V
IN
OUT
List of ceramic capacitors for the LED2000
OUT
I
O
f
+
–
SW
–
+
V
V
V
V
F
SW
SW
F
1
–
GRM42-2 X7R 475K 50
D
--- -
UMK325BJ106MM-T
Doc ID 023432 Rev 3
D
+
Series
D --- -
O
divided by 2. The maximum and minimum duty cycles
1 D
–
MIN
to D
MAX
Capacitor value
, it is possible to determine the max.
(µC)
4.7
SW
10
the voltage drop across the
Application information
Rated voltage (V)
50
50
25/40