Datasheet

n
V
IN
V
OUT
= 4n·V
IN
n
V
IN
V
OUT +
= 2n·V
IN
V
OUT -
= 2n·V
IN
n
V
IN
V
OUT+
= n·V
IN
V
OUT-
= n·V
IN
n
V
IN
V
OUT
= 2n·V
IN
SN6501
SLLSEA0F –FEBRUARY 2012–REVISED AUGUST 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 69 to Figure 72 show some of
these topologies together with their respective open-circuit output voltages.
Figure 69. Bridge Rectifier with Center-Tapped Figure 70. Bridge Rectifier Without Center-Tapped
Secondary Enables Bipolar Outputs Secondary Performs Voltage Doubling
Figure 71. Half-wave Rectifier Without Center- Figure 72. Half-wave Rectifier Without Centered
tapped Secondary Performs Voltage Doubling, Ground and Center-tapped Secondary Performs
Centered Ground provides Bipolar Outputs Voltage Doubling Twice, Hence Quadrupling V
IN
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
22 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links :SN6501