SN6501 Datasheet, PDF (1/26 Pages) Texas Instruments – Transformer Driver for Isolated Power Supplies

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SN6501
SLLSEA0C – FEBRUARY 2012 – REVISED MARCH 2012
Transformer Driver for Isolated Power Supplies
Check for Samples: SN6501
FEATURES
1
• Push-Pull Driver for Small Transformers
• Single 3.3 V or 5 V Supply
• High Primary-side Current Drive:
– 5 V Supply: 350 mA (max)
– 3.3 V Supply: 150 mA (max)
• Low Ripple on Rectified Output Permits Small
Output Capacitors
• Small 5-pin SOT23 Package
APPLICATIONS
• Isolated Interface Power Supply for CAN, RS-
485, RS-422, RS-232, SPI, I2C, Low-Power LAN
• Industrial Automation
• Process Control
• Medical Equipment
DESCRIPTION
The SN6501 is a monolithic oscillator/power-driver, specifically designed for small form factor, isolated power
supplies in isolated interface applications. It drives a low-profile, center-tapped transformer primary from a 3.3 V
or 5 V DC power supply. The secondary can be wound to provide any isolated voltage based on transformer
turns ratio.
The SN6501 consists of an oscillator followed by a gate drive circuit that provides the complementary output
signals to drive the ground referenced N-channel power switches. The internal logic ensures break-before-make
action between the two switches.
The SN6501 is available in a small SOT23-5 package, and is specified for operation at temperatures from –40°C
to 125°C.
VIN = 3.3V
10µF
SN6501
4
3
GND D2
2
Vcc
5
1
GND D1
MBR0520L
1:2.2
MBR0520L
VOUT
10µF 0.1µF
TPS76350
1
IN
2
GND
3
EN
5
OUT
4
NC
VOUT-REG = 5V
10µF
Figure 1. Typical Operating Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated