PTH04T230W Datasheet, PDF (27/35 Pages) Texas Instruments – 6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans™

PTH04T230W, PTH04T231W
www.ti.com
SLTS271A – SEPTEMBER 2006 – REVISED OCTOBER 2006
Notes on Use of Auto-Track™
1. The Track pin voltage must be allowed to rise above the module set-point voltage before the module
regulates at its adjusted set-point voltage.
2. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with ramp
speeds of up to 1 V/ms.
3. The absolute maximum voltage that may be applied to the Track pin is the input voltage V_I.
4. The module cannot follow a voltage at its track control input until it has completed its soft-start initialization.
This takes about 20 ms from the time that a valid voltage has been applied to its input. During this period, it
is recommended that the Track pin be held at ground potential.
5. The Auto-Track function is disabled by connecting the Track pin to the input voltage (V_I). When Auto-Track
is disabled, the output voltage rises at a quicker and more linear rate after input power has been applied.
V_I = 5 V
6
3
MR
5
SENSE
C₄
0.1 µF
U3
TPS3808G50
4
CT
1
RESET
GND
2
C₃
4700 µF
Auto Track
Vi
TurboTrans
+Sense
Inhibit/
UVLO
U1
PTH05T210W
Vo
−Sense
+
GND
VoAdj
C_I1
R_SET1
1.62 kΩ
R_TT
V_O1 = 3.3 V
C_O1
Auto Track
SmartSync
TurboTrans
+Sense
Vi
Inhibit/
UVLO
U2
PTH04T230W
Vo
−Sense
GND
VoAdj
+
R_SET2
C_I2
4.75 kΩ
R_TT
V_O2 = 1.8 V
C_O2
Figure 24. Sequenced Power Up and Power Down Using Auto-Track
UDG−06042
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