LP5524TM-5EV National Semiconductor, LP5524TM-5EV Datasheet - Page 7

• Manufacturer Part Number: LP5524TM-5EV
• Description: BOARD EVALUATION FOR LP5524
• Manufacturer: National Semiconductor

Specifications of LP5524TM-5EV

• Current - Output / Channel: 100mA
• Outputs And Type: 4, Non-Isolated
• Features: Programmable output current
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LP5524
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Not Compliant

Recommended External Components
INPUT CAPACITOR, C
Although not required for normal operation, a capacitor can
be added to V
layer ceramic capacitor (MLCC) is recommended. MLCCs
with a X7R or X5R temperature characteristic are preferred.
CURRENT SET RESISTOR, R
If other than 5 mA current is required, R
used to adjust the current. For 15.9 mA current 32.4 kΩ re-
List of Recommended External Components
Recommended E96 Series (1% Tolerance) Current Set Resistors
I
Symbol
C
R
LEDs
DX
IN
ISET
= 515 / R
R
ISET
ISET
84.5
73.2
64.9
56.2
51.1
46.4
42.2
39.2
36.5
IN
169
127
102
to reduce line noise. A surface-mount multi-
(kΩ)
(Amps)
Symbol Explanation
VDD Bypass Capacitor
Current Set Resistor for 15.9 mA LED Current 32.4
IN
ISET
ISET
I
DX
resistor can be
10.1
11.1
12.2
13.1
14.1
3.0
4.1
5.0
6.1
7.0
7.9
9.2
(mA)
7
Value
100
User defined
sistor is required. Accuracy of the resistor directly effects to
the accuracy of the LED current. 1% or better is recommend-
ed.
LED
Forward voltage of LED must be less than minimum input
voltage minus minimum headroom voltage (V
ple with 2.7V input voltage and 20 mA LED current the max-
imum LED forward voltage is 2.7V - 100 mV = 2.6V.
R
ISET
34.0
32.4
30.1
28.7
26.7
25.5
24.3
23.2
22.1
21.5
20.5
(kΩ)
Unit
nF
kΩ
Type
Ceramic, X7R or X5R
1%
I
DX
15.1
15.9
17.1
17.9
19.3
20.2
21.2
22.2
23.3
24.0
25.1
(mA)
HR
). For exam-
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