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SN6507 Datasheet(PDF) 21 Page - Texas Instruments

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Part # SN6507
Description  SN6507 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) 21 Page - Texas Instruments

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The output frequency of the oscillator is divided down by an asynchronous divider that provides two
complementary output signals, S and S, with a 50% duty cycle. A subsequent break-before-make logic inserts
a dead-time between the high-pulses of the two signals. The resulting output signals, G1 and G2, present the
gate-drive signals for the output transistors Q1 and Q2. As shown in Figure 9-2, before either one of the gates
can assume logic high, there must be a short time period during which both signals are low and both transistors
are high-impedance. This short period, known as break-before-make time, is required to avoid shorting out both
ends of the primary.
9.2 Typical Application
Two application cases are discussed. One is for Fixed input with slew rate control. The other is for wide-ranging
input with duty cycle control.
VCC
V
OUT = 15V
GND
SW1
SW2
RILIM
CSS
GND
EN/UVLO
DC
CLK
SR
SS/ILIM
V
IN = 24V
10µF
10µF
VIN
FB
LDO
VOUT
0.1µF
10µF
1:N
RCLK
RENT
RENB
RSR
Figure 9-3. Typical Application Schematic for Fixed Input with Slew Rate Control
VCC
V
OUT = 15V
GND
SW1
SW2
RILIM
CSS
GND
EN/UVLO
DC
CLK
SR
SS/ILIM
V
IN = 18V-30V
10µF
10µF
VIN
FB
LDO
VOUT
0.1µF
10µF
1:N
L
RDC
RCLK
RENT
RENB
Figure 9-4. Typical Application Schematic for Wide-Ranging Input with Duty Cycle Control
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 9-1 as design parameters.
Table 9-1. Design Parameters
PARAMETER
COMMENT
EXAMPLE VALUE
Fixed VIN
Input voltage for fixed input case
24 V ± 2%
Wide-ranging VIN
Input voltage range for wide-input case
18 V (min)
24 V (typ.)
30 V (max)
fSW
Switching frequency
1 MHz ± 10%
VOUT
Output voltage
15 V
ILOAD
Load current
200 mA
ILIM
Peak Current Limit
500 mA
UVLO
Under Voltage Lockout
9 V
SS
Soft-Start Time
2 ms
www.ti.com
SN6507
SLLSFM0A – MARCH 2022 – REVISED JUNE 2022
Copyright © 2022 Texas Instruments Incorporated
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