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dc1477bfa

DEMO MANUAL DC1477B

Quick start proceDure

Demonstration circuit DC1477B is an easy way to evalu-

ate the performance of the LTM4609EV. Please refer to 

Figure 1 for proper measurement equipment setup and 

follow the procedure below: 
1. Place jumpers in the following positions for a typical 

30V

OUT

 application:

RUN

CLOCK

MODE

START

ON

PROG

CCM

SSO

2. With the power supply off, connect the input power 

supply, load and meters as shown in Figure 1. Preset 

the load to 0A and V

IN

 supply between 10V to 36V. 

3. Turn on the power at the input. The output voltage 

should be 30V ± 2%.

4.  Once the proper output voltage is established, adjust the 

load within the operating range and observe the output 

voltage regulation, ripple voltage, efficiency and other 

parameters. A cooling fan and heat sink are necessary 

for V

IN

 <10V and I

OUT 

= 3A.

5. To measure input and output ripple, please refer to 

Figure 2 for proper setup.

6. To adjust the switching frequency turn off the power 

supply and modify R6 and R7. Do not allow voltage at 

pin PLLFLTR to exceed 2.4V.

7. Inductor and R

SENSE

 should be modified to accom-

modate certain input and output condition. Refer to 

the data sheet for details.

8. The input filter formed by CIN2, L2 and L3, CIN3 and 

CIN4 is for the purpose of reducing the input voltage 

ripple. The magnetic beads L2 and L3 are not necessary, 

but they help to reduce the high frequency ringings on 

the input supply significantly. See Figure 5 for details.

9.  The optional components Rsnb1 and Csnb1, Rsnb2 and 

Csnb2 can be used to form RC snubber circuits on the 

switching nodes, which may help to reduce the output 

ripple. Refer to the data sheet for details.

Summary of Contents for DC1477B

Page 1: ...and the Linear logo are registered trademarks of Linear Technology Corporation All other trademarks are the property of their respective owners Performance Summary Board Photo 200kHz to 400kHz to red...

Page 2: ...voltage efficiency and other parameters A cooling fan and heat sink are necessary for VIN 10V and IOUT 3A 5 To measure input and output ripple please refer to Figure 2 for proper setup 6 To adjust th...

Page 3: ...dc1477bfa DEMO MANUAL DC1477B quick start procedure Figure 1 Test Setup of DC1477B Figure 2 Proper Scope Probe Placement for Measuring Input or Output Ripple LOAD 0 TO 3A VIN INPUT OR OUTPUT CAPACITO...

Page 4: ...DC1477B LTM4609 EFFICIENCY AT 20VIN Input 0 100 90 80 70 60 50 0 5 1 1 5 2 2 5 3 EFFICIENCY DCM BURST CCM LOAD CURRENT A DC1477B LTM4609 EFFICIENCY AT 30VIN Input 0 100 90 80 70 60 50 0 5 1 1 5 2 2 5...

Page 5: ...IN 10V VOUT 30V CCM MODE 1 5A to 3A LOAD STEP COUT 2 10 F CERAMIC 2 100 F ALUM VOUT 200mV DIV IOUT STEP 1A DIV VIN 36V VOUT 30V CCM MODE 1 5A to 3A LOAD STEP COUT 2 10 F CERAMIC 2 100 F ALUM VIN 1V DI...

Page 6: ...206 VISHAY WSL1206R0150FEA 12 1 U1 I C HIGH DENSITY HIGH OUTPUT BUCK BOOST Module 15mm 15mm 2 82mm LGA LINEAR TECH LTM4609EV PBF Additional Demo Board Circuit Components 1 0 CIN5 Csnb1 Csnb2 C07 OPT C...

Page 7: ...lvd LTC Confidential For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RE...

Page 8: ...CLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR C...

Page 9: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Analog Devices Inc DC1477B...

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