Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ENVIRONMENTAL AND ABSOLUTE MAXIMUM RATINGS
- ELECTRICAL CHARACTERISTICS
- ELECTRICAL CHARACTERISTICS
- TYPICAL CHARACTERISTICSThe electrical characteristic data has been developed from actual products tested at 25C. This data is considered typical for the converter. Applies to , , and .The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper. For surface mount packages (AS and AZ suffix), multiple vias must be utilized. Please refer to the mechanical specification for more information. Applies to .
- TYPICAL CHARACTERISTICSThe electrical characteristic data has been developed from actual products tested at 25C. This data is considered typical for the converter. Applies to , , and .The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper. For surface mount packages (AS and AZ suffix), multiple vias must be utilized. Please refer to the mechanical specification for more information. Applies to .
- APPLICATION INFORMATION
- ADJUSTING THE OUTPUT VOLTAGE
- CAPACITOR RECOMMENDATIONS FOR THE PTH04T240/241W POWER MODULE
- TurboTrans Technology
- TurboTrans Selection
- UNDERVOLTAGE LOCKOUT (UVLO)
- Soft-Start Power Up
- On/Off Inhibit
- Smart Sync
- Overcurrent Protection
- Overtemperature Protection (OTP)
- Differential Output Voltage Remote Sense
- Auto-Track Function
- Tape & Reel and Tray Drawings
Smart Sync
PTH04T240W
Vi
Track
GND VoAdj
Vo
TT
+Sense
−Sense
Inhibit/
UVLO
GND
D
PRE
PTH08T220W
Vi
GND VoAdj
Vo
TT
+Sense
−Sense
+
Inhibit/
UVLO
Sync
+
+
QCLK
SN74LVC2G74
+
SYNC
R
SET1
330 µF
f
CLK
= 2 x f
MODULE
V
O1
0°
180°
V
CC
CLR
Q
V
O2
C
O1
C
O2
UDG−06051
C
I1
C
I2
R
SET2
220 µF
220 µF
220 µF
Track
V
I
=5 V
PTH04T240W , PTH04T241W
SLTS276D – OCTOBER 2006 – REVISED JULY 2009 ......................................................................................................................................................
www.ti.com
Smart Sync is a feature that allows multiple power modules to be synchronized to a common frequency. Driving
the Smart Sync pins with an external oscillator set to the desired frequency, synchronizes all connected modules
to the selected frequency. The synchronization frequency can be higher or lower than the nominal switching
frequency of the modules within the range of 240 kHz to 400 kHz (see Electrical Specifications table for
synchronization limits). Synchronizing modules powered from the same bus, eliminates beat frequencies
reflected back to the input supply, and also reduces EMI filtering requirements. Eliminating the low beat
frequencies (usually < 10 kHz) allows the EMI filter to be designed to attenuate only the synchronization
frequency. Power modules can also be synchronized out of phase to minimize source current loading and
minimize input capacitance requirements. Figure 23 shows a standard circuit with two modules syncronized 180 °
out of phase using a D flip-flop.
Figure 23. Smart Sync Schematic
26 Submit Documentation Feedback Copyright © 2006 – 2009, Texas Instruments Incorporated
Product Folder Link(s): PTH04T240W PTH04T241W