IRPLLED1 International Rectifier, IRPLLED1 Datasheet - Page 5

• Manufacturer Part Number: IRPLLED1
• Description: BOARD EVALUATION FOR IRS2540PBF
• Manufacturer: International Rectifier

Specifications of IRPLLED1

• Current - Output / Channel: 1.5A
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 24V
• Features: Dimmable
• Voltage - Input: 50 ~ 170V
• Utilized Ic / Part: IRS2540PBF
• Core Chip: IRS2540, IRS2541, IRS25401
• Topology: Buck (Step Down)
• No. Of Outputs: 1
• Output Current: 1.5A
• Output Voltage: 500mV
• Dimming Control Type: PWM
• Development Tool Type: Hardware - Eval/Demo Board
• Lead Free Status / RoHS Status: Contains lead / RoHS compliant by exemption

Since some of these equivalent values of resistance are not available, series and parallel combinations are used and
are specified as follows (all combinations use standard value resistors: 1.43Ω, 0.56Ω, and 0.47Ω):
Although some of the series and parallel combinations do not yield the exact resistance needed for tolerance
purposes, they are accurate enough. For this evaluation board an extremely tight current regulation is achieved with
a worst case result of ±1.2% for the 350mA setting over the bus voltage range from 50V to 170V. Likewise a precise
regulation of ±0.25% can be maintained for a range of load voltage from 16V to 24V at the 350mA current setting.
The jumper positions on the evaluation boards (JSET) for setting the different load currents are shown below:
www.irf.com
R
R
R
R
1A
1 A
350mA
700mA
5 .
=
=
0
= 43
=
5 .
. 0
. 1
Ω
. 0
33
71
≈
Ω
Ω
Ω
(
≈
. 0
≈
47
(
. 0
. 1 (
Ω
47
43
+
Ω
Ω
1600
1400
1200
1000
. 0
+
800
600
400
200
||
56
. 0
. 1
0
Ω
56
43
30
)
Ω
Ω
Fig. 4a: JSET LED Current Programming Settings
( ||
Fig. 5 Vout = 16V, L1 = 470uH, COUT = 33uF
)
)
. 0
( ||
=
47
. 0
. 0
50
Ω
47
715
+
Ω
Ω
. 0
+
56
. 0
Ω
RD-0608
56
70
)
Ω
=
)
. 0
( ||
515
. 0
90
47
Ω
Ω
Vin (V)
+
. 0
110
56
Ω
)
=
. 0
130
343
Ω
150
±0.3%
±0.5%
±0.6%
±1.2%
350mA
700mA
1A
1.5A
170
5