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A7442 Datasheet(PDF) 15 Page - AIT Components Ltd.

Part No. A7442
Description  DC-DC CONVERTER/ BUCK HIGH PERFORMANCE CV/CC QUICK CHARGER SYNCHRONOUS
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Maker  AITCOMPONENTS [AIT Components Ltd.]
Homepage  http://aitcomponents.com
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 15 page
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AiT Semiconductor Inc.
www.ait-ic.com
A7442
DC-DC CONVERTER/ BUCK (STEP-DOWN)
40V, 4.2AHIGHPERFORMANCE CV/CC QUICK CHARGERSYNCHRONOUS
REV1.0
- JUL 2017 RELEASED -
- 15 -
APPLICATIONS INFORMATION
Design Requirement
Design Parameters
Target Values
Input Voltage Range
6V to 40V
Typical Input Voltage
24V
Output Voltage
5V
Output Current Rating
3.5A
VCCOMP at Full Load
250mV
Table 1. Design Parameters
Setting the CC Limit
The simplified application circuit is showed on the front page. Figure 1 shows the CC Limit at 5V output verse
RS. According to this figure, RS should be set at around 15m
Ω to output 3.5A continuous current.
Setting the Cable Compensation Resistor
The cable compensation resistor, RCC, determines the gain of the cable compensation. By subtitling VCCOMP,
IOUT, RS, VOS and K into the Equation 1, RCC = 18.21
kΩ. 18kΩ is the closest E24 standard value. Table 2.
Shows the cable compensation voltage at different load with RCC = 18
kΩ and RS = 15mΩ.
ILOAD (A)
VCCOMP (mV)
0
0
0.5
21
1
59
1.5
96
2
134
2.4
164
3
209
3.5
247
Table 2. Cable Compensation Voltage at Different Load
Setting the Output Voltage
The feedback resistors, R1 and R2, together with the cable compensation resistor, RCC, program the output
voltage at no load condition according to the Equation 2.
For QC 2.0 / 3.0 applications, the upper feedback resistor(RCC + R1) is fixed at 100k
Ω generally for
compatibility. Thus, R1 = 100
kΩ - 18kΩ = 82kΩ. By subtitling RCC, R1 and VOUT into the Equation 2, R2 = 25kΩ
(24.9
kΩ is the closest standard value).




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