Datasheet > EEE-FK1V101P-T

EEE-FK1V101P-T

更新时间： 2024-09-09 10:22:51

品牌	Logo	应用领域
英特矽尔 - INTERSIL		稳压器
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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EEE-FK1V101P-T 数据手册

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.

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.

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.

12 3 4 5 6 7...9

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