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SN6507 Datasheet(PDF) 13 Page - Texas Instruments

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Part # SN6507
Description  SN6507-Q1 Low-Emissions, 36-V Push-Pull Transformer Driver with Duty Cyle Control for Isolated Power Supplies
PDF  44 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN6507 Datasheet(HTML) 13 Page - Texas Instruments

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8.2 Functional Block Diagram
SW1
SW2
MOSFET
Driver
EN/UVLO
VCC
+
–
+
–
VREF_EN
VREF_UVLO
Control Logic
UVLO
EN
LDO
Bandgap
Internal
Bias
CLK
External
CLK Detect
MUX
÷2
Oscillator with SSC and
Duty Cycle Control
DC
SR
SS/ILIM
OCP
ILIM
Thermal
Detection
SS
+
–
OVP
GND
GND
Soft Start
ILIM Sensor
TSD
VREF_OV
IBIAS
RENT
RENB
RCLK
RDC
RSR
RILIM
CSS
8.3 Feature Description
8.3.1 Push-Pull Converter
Push-pull converters require transformers with center-taps to transfer power from the primary to the secondary
as shown in Figure 8-1. When Q1 conducts, VIN drives a current through the lower half of the primary to ground,
thus creating a negative voltage potential at the lower primary end with regards to the VIN potential at the
center-tap. .
C
CR1
CR2
Q1
Q2
VIN
VOUT
RL
C
CR1
CR2
Q1
Q2
VIN
VOUT
RL
Figure 8-1. Switching Cycles of a Push-Pull Converter
At the same time the voltage across the upper half of the primary is such that the upper primary end is positive
with regards to the center-tap in order to maintain the previously established current flow through Q2, which now
has turned high-impedance. The two voltage sources, each of which equaling VIN, appear in series and cause a
voltage potential at the open end of the primary of 2×VIN with regards to ground.
www.ti.com
SN6507-Q1
SLLSFM1 – SEPTEMBER 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: SN6507-Q1



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