Datasheet

PRI
IN
V
D =
V
C
SS
R
t
C
C
C
BOOT
C
IN
C
Y
PH
VIN
GND
BOOT
VSENSE
COMP
TPS55010
EN
RT/CLK
SS
FAULT
T1
R
HS
R
LS
INPUT
+5V
1:8:8
C pos
O
Dneg
+
V neg
O
_
C neg
O
N
PRI
C
PRI
Nsec1
Nsec2
+
V pos
O
_
Dpos
TPS55010
SLVSAV0A –APRIL 2011–REVISED JUNE 2011 www.ti.com
POWER DISSIPATION
Figure 42. 5V to 15V/-15V Isolated Power Supply
DESIGN GUIDE – STEP-BY-STEP DESIGN PROCEDURE
Table 5.
Input Voltage 5V nominal (4.5V to 5.5V)
Positive Output Voltage, Vopos +15V
Negative Output Voltage, Voneg -15V
Output Voltage Ripple <0.5%
Output Current Iopos, Ioneg 40mA
Start Voltage 4.5V
Stop Voltage 4V
PRIMARY SIDE VOLTAGE FOR DUAL OUTPUT
Similar to the single output design, the dual output voltages are a function of the primary voltage, transformer
turns ratio and the diode voltages. Using the same design constraints as the single, the primary side voltage
could be from 3.6 V to 1.1 V. A 1.93 V primary side voltage is selected, and the duty cycle is approximately
38.5%.
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