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GMK325BJ106KN-T

更新时间： 2024-11-24 10:43:23
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英特矽尔 - INTERSIL 稳压器电容器PC
页数 文件大小 规格书
9页 1138K
描述
Wide VIN Dual Standard Buck Regulator With 3A/3A Output Current

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GMK325BJ106KN-T 数据手册

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Application Note 1574  
Author: Paul Orfanu  
ISL85033DUALEVAL1Z Wide VIN Dual Standard  
Buck Regulator With 3A/3A Output Current  
Quick Setup Guide  
Description  
1. Ensure that the circuit is correctly connected to the  
The ISL85033DUALEVAL1Z kit is intended for use by  
supply and loads prior to applying any power.  
individuals with requirements for Point-of-Load  
applications sourcing from 4.5V to 28V. The  
ISL85033DUALEVAL1Z evaluation board is used to  
demonstrate the performance of the ISL85033 wide VIN  
dual standard buck regulator with 3A/3A output  
current converter.  
2. Connect the bias supply to VIN1, the plus terminal  
to VIN1 and the negative return to GND2.  
3. Verify that the position is ON for S1 and S2.  
4. Turn on the power supply.  
5. Verify the output voltage is 5V for V  
OUT1  
and 3.3V  
The ISL85033 is offered in a 4mmx4mm 28 Ld TQFN  
package with 1mm maximum height. The complete  
for V  
OUT2.  
2
Evaluating the Other Output Voltage  
The ISL85033DUALEVAL1Z kit outputs are preset to 5V  
for V and 3.3V for V ; however, output voltages  
converter occupies 6.25cm area.  
Key Features  
OUT1 OUT2  
can be adjusted from 0.8V to 5V. The output voltage  
programming resistor, R3 (or R14 in Channel 2), will  
depend on the desired output voltage of the regulator  
and the value for the feedback resistor R2 (R16  
respectively), as shown in Equation 1.  
• Wide Input Voltage Range from 4.5V to 28V  
• Adjustable Output Voltage with Continuous Output  
Current up to 3A  
• Current Mode Control  
• Adjustable Switching Frequency from 300kHz to 2MHz  
• Independent Power-Good Detection  
R3 = (V  
– V ) • R2 ⁄ V  
FB FB  
OUT1  
(EQ. 1)  
• Selectable In-Phase or Out-of-Phase PWMs Switching  
Operation  
R14 = (V  
– V ) • R16 ⁄ V  
FB FB  
OUT2  
• Independent, Sequential, Ratiometric or Absolute  
Tracking Between Outputs  
If the output voltage desired is 0.8V, then R3 (R14  
respectively) is shorted. The value for R2 (R16  
respectively) is typically between 1k and 10k. Please  
note that if VOUT is less than 2.5V, the switching  
frequency and compensation must be changed for  
300kHz operation due to minimum on-time limitation.  
Please refer to the data sheet for further information  
(FN6676).  
• Internal 2ms Soft-start Time  
• Overcurrent and Hiccup Mode Short Circuit  
Protection, Thermal Overload Protection, UVLO  
• Boot Undervoltage Detection  
• Channels are Out-of-phase, Reducing Voltage Ripple  
and Component Size  
Frequency Control  
Recommended Equipment  
ISL85033 has an FS pin that controls the frequency of  
operation. Programmable frequency allows for  
optimization between efficiency and external  
component size. Default switching frequency is 500kHz  
when FS is tied to VCC (R9 = 0). By removing R9 and  
connecting R10 to ground, the switching frequency  
could be changed from 300kHz (R10 = 383k) to 2MHz  
(R10 = 40.2k). Please refer to the data sheet  
(FN6676) for calculating the value of R10. Do not leave  
this pin floating.  
The following materials are recommended to perform  
testing:  
• 0V to 30V Power Supply with at least 7A source  
current capability or 5V battery  
• Electronic Loads capable of sinking current up to 7A  
• Digital Multimeters (DMMs)  
• 100MHz quad-trace oscilloscope  
• Signal generator  
November 29, 2010  
AN1574.2  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
Copyright Intersil Americas Inc. 2010. All Rights Reserved.  
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.  
All other trademarks mentioned are the property of their respective owners.  
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