LED2000PUR STMicroelectronics, LED2000PUR Datasheet - Page 17
LED2000PUR
Manufacturer Part Number
LED2000PUR
Description
LED Lighting Drivers 3.0V to 18V 850kHz 100mV 95mOhm HS
Manufacturer
STMicroelectronics
Datasheet
1.LED2000DR.pdf
(40 pages)
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
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LED2000
6.5
Equation 14
Total loop gain
In summary, the open loop gain can be expressed as:
Equation 15
Example 1
Design specification:
V
The inductor and capacitor value are dimensioned in order to meet the I
specification (see
L=10 H, C
Accordingly, with
Equation 16
Equation 17
The gain and phase margin Bode diagrams are plotted respectively in
Figure
IN
G s
R
=12 V, V
S
LED
=
LED
=
10.
-------------------- -
700 mA
100 mV
n
G
LED
CO
n
OUT
LED
FW_LED
=
s
=2.2 F MLCC (negligible ESR)
---------------------------------------------------------------- -
n
=
140 m
LED
Section 7.1.1
A
---------------------------------------------------------------- -
n
Section 7.1.2
0
LED
=3.5 V, n
s
R
r
LED
SENSE
R
r
LED
SENSE
LED
+
LED
R
+
SENSE
Doc ID 023432 Rev 3
n
R
LED
the sensing resistor value is:
= 2, r
SENSE
for output capacitor and inductor selection guidelines):
LED
=
= 1.1 , I
-------------------------------------------------- -
2
1.1
140 m
+
LED
140 m
= 700 mA, I
=
0.06
LED RIPPLE
Figure 9
LED RIPPLE
Application notes
= 2%
and
17/40