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SN6501

SLLSEA0E – FEBRUARY 2012 – REVISED JANUARY 2013

www.ti.com

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 53 to Figure 56 show some of

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

Figure 53. Bridge Rectifier with Center-Tapped

Figure 54. Bridge Rectifier Without Center-Tapped

Secondary Enables Bipolar Outputs

Secondary Performs Voltage Doubling

Figure 55. Half-wave Rectifier Without Center-

Figure 56. Half-wave Rectifier Without Centered

tapped Secondary Performs Voltage Doubling,

Ground and Center-tapped Secondary Performs

Centered Ground provides Bipolar Outputs

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 4.

Table 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

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