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Linear Technology 908A, Quick Start Manual

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Linear Technology 908A Quick Start Manual Download Page 4

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 908A 

POLYPHASE 3-OUTPUT STEP-DOWN SUPPLY WITH TRACKING 

 

 

4

 

V

O

U

T

G

N

D

 

Figure 2. Measuring Output Voltage Ripple 

+

-

Oscilloscope

Vout1 

load

A

Iout1

Pulse 
generator

COAX cable

 

Figure 3. Proper Measurement Equipment Setup for Load Step Testing. Only the setup for the 3.3V rail is shown. 

Summary of Contents for 908A

Page 1: ...ides current for the LTC3773EG s internal logic and gate drive circuitry The 5V bias can also be supplied externally If an external bias voltage is applied it needs to be between 4 5V and 7 0V Design files for this circuit board are available Call the LTC factory Table 1 Performance Summary TA 25 C PARAMETER CONDITION VALUE Minimum Input Voltage 7V Maximum Input Voltage 24V VOUT1 VIN 7V to 24V IOU...

Page 2: ...le to supply at least 20A NOTE Make sure the input voltage does not exceed 24V 4 Check for the proper output voltages Vout1 3 201V to 3 399V Vout2 2 425V to 2 575V Vout3 1 746V to 1 854V 5 Once the proper output voltages are established adjust the loads within the operating range and ob serve the output voltage regulation ripple voltage efficiency and other parameters LOAD STEP RESPONSE The load s...

Page 3: ...alues for the TRACK 1 divider at R40 and R41 and apply the tracking signal to the TRACK1 turret If desired the rails can be configured to be turned on and off independently To do this remove the TRACK2 and TRACK3 dividers at R33 R35 R38 and R39 and stuff TRACK capacitors at C31 and C32 to set the de sired ramp rate Rail sequencing can be implemented by placing a capacitor on the SDB pin As the vol...

Page 4: ...E 3 OUTPUT STEP DOWN SUPPLY WITH TRACKING 4 VOUT GND Figure2 Measuring Output Voltage Ripple Oscilloscope Vout1 load A Iout1 Pulse generator COAX cable Figure3 Proper Measurement Equipment Setup for Load Step Testing Only the setup for the 3 3V rail is shown ...

Page 5: ...PLY WITH TRACKING 5 Efficiency at Vin 12V Fsw 220kHz 84 86 88 90 92 94 96 0 3 6 9 12 15 18 Load current Amps Efficiency 3 3V 1 8V 2 5V Efficiency at Vin 24V Fsw 220kHz 80 82 84 86 88 90 92 0 3 6 9 12 15 18 Load current Amps Efficiency 3 3V 1 8V 2 5V Figure4 Typical efficiency curves ...

Page 6: ...TION CIRCUIT 908A POLYPHASE 3 OUTPUT STEP DOWN SUPPLY WITH TRACKING 6 3 3V 2 5V 1 8V SDB 2V div 2msec div Vo1 2 3 1V div Figure5 Turn on waveforms at Vin 12V after SDB pin is released Demo board is setup for coincident rail tracking ...

Page 7: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 908A POLYPHASE 3 OUTPUT STEP DOWN SUPPLY WITH TRACKING 7 ...

Page 8: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 908A POLYPHASE 3 OUTPUT STEP DOWN SUPPLY WITH TRACKING 8 ...

Page 9: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Analog Devices Inc DC908A ...

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