IRPLLED1A International Rectifier, IRPLLED1A Datasheet - Page 6

• Manufacturer Part Number: IRPLLED1A
• Description: Power Management IC Development Tools Hi-Vlt DC-DC Buck Cnvr HBLED Cur Cntrl
• Manufacturer: International Rectifier
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of IRPLLED1A

• Product: Power Management Development Tools
• Tool Is For Evaluation Of: IRS25401PBF
• Output Voltage: 16 V to 24 V
• Output Current: 350 mA to 1.5 A
• Factory Pack Quantity: 1

The frequency in the IRS25401/11 application is free running and maintains current regulation by quickly adapting
to changes in input and output voltages. There is no need for additional external components to set the frequency as
seen in other controllers. The frequency is determined by L1 and COUT, as well as the input/output voltages and
load current. The selection of the frequency is a trade-off between system efficiency, current control regulation, size,
and cost.
The higher the frequency, the smaller and lower the cost of L1 and COUT, the higher the ripple, the higher the FET
switching losses, which becomes the driving factor as VBUS increases to higher voltages, the higher the component
stresses and the harder it is to control the output current.
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3. Frequency selection
1600
1400
1200
1000
1600
1400
1200
1000
800
600
400
200
800
600
400
200
0
0
10
30
Fig. 6 Vbus = 100V, L1 = 470uH, COUT = 33uF
Fig. 5 Vout = 16V, L1 = 470uH, COUT = 33uF
50
15
RD-0608
70
90
Vout (V)
Vin (V)
20
110
130
25
150
±0.1%
±0.17%
±0.13%
±0.25%
±0.3%
±0.5%
±0.6%
±1.2%
350mA
700mA
1A
1.5A
170
350mA
700mA
1A
1.5A
30
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