IRPLLED1 International Rectifier, IRPLLED1 Datasheet - Page 10
IRPLLED1
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
The addition of the COUT is essentially increasing the amount of energy that can be stored in the output stage,
which also means it can supply current for an increased period of time. Therefore by slowing down the di/dt
transients in the load, the frequency is effectively decreased.
With the COUT capacitor added to the circuit the inductor current is no longer identical to that seen in the load. The
inductor current has a triangular shape, where as the load will see the same basic trend in the current, but all sharp
corners become rounded with peaks significantly reduced, as can be seen in Fig. 14 and 13.
www.irf.com
Fig. 14 Iout = 350mA, Vin = 100V, Vout = 16.85V, L = 470uH, COUT = 33uF
400
350
300
250
200
150
100
50
0
0
Fig. 13 Iout = 350mA, Vout = 16.8V, L = 470uH
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RD-0608
Capacitance (uF)
20
30
40
50
40V
100V
160V
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