8.2.3 Application Curve

See Table 8-3 for application curves.

8.2.4 Higher Output Voltage Designs

The SN6501 can drive push-pull converters that provide high output voltages of up to 30 V, or bipolar outputs of

up to ±15 V. Using commercially available center-tapped transformers, with their rather low turns ratios of 0.8 to

5, requires different rectifier topologies to achieve high output voltages. Figure 8-8 to Figure 8-11 show some of

these topologies together with their respective open-circuit output voltages.

n

V

IN

VOUT+ = n·VIN

VOUT- = n·VIN

Figure 8-8. Bridge Rectifier With Center-Tapped

Secondary Enables Bipolar Outputs

n

V

IN

V

OUT = 2n·VIN

Figure 8-9. Bridge Rectifier Without Center-Tapped

Secondary Performs Voltage Doubling

n

VIN

VOUT+ = 2n·VIN

VOUT- = 2n·VIN

Figure 8-10. Half-Wave Rectifier Without Center-

Tapped Secondary Performs Voltage Doubling,

Centered Ground Provides Bipolar Outputs

n

VIN

V

OUT = 4n·VIN

Figure 8-11. Half-Wave Rectifier Without Centered

Ground and Center-Tapped Secondary Performs

Voltage Doubling Twice, Hence Quadrupling VIN

8.2.5 Application Circuits

The following application circuits are shown for a 3.3 V input supply commonly taken from the local, regulated

micro-controller supply. For 5 V input voltages requiring different turn ratios refer to the transformer

manufacturers and their websites listed in Table 8-4.

Table 8-4. Transformer Manufacturers

Coilcraft Inc.

http://www.coilcraft.com

Halo-Electronics Inc.

http://www.haloelectronics.com

Murata Power Solutions

http://www.murata-ps.com

Wurth Electronics Midcom Inc

http://www.midcom-inc.com

www.ti.com

SN6501

SLLSEA0I – FEBRUARY 2012 – REVISED JANUARY 2021

Copyright © 2021 Texas Instruments Incorporated

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