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| 型号： | TPS54160DGQR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.7 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 8/50页 |
| 文件大小： | 1375K |
| 代理商： | TPS54160DGQR |
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( )
(
)
( )
m
=
SS
REF
t
ms
I
A
C
nF
V
0.8
EN
SS/TR
V
SENSE
VOUT
SLVS795C – OCTOBER 2008 – REVISED OCTOBER 2010
www.ti.com
DETAILED DESCRIPTION (continued)
Slow Start/Tracking Pin (SS/TR)
The TPS54160 effectively uses the lower voltage of the internal voltage reference or the SS/TR pin voltage as
the power-supply's reference voltage and regulates the output accordingly. A capacitor on the SS/TR pin to
ground implements a slow start time. The TPS54160 has an internal pull-up current source of 2mA that charges
the external slow start capacitor. The calculations for the slow start time (10% to 90%) are shown in Equation 6.
The voltage reference (VREF) is 0.8 V and the slow start current (ISS) is 2mA. The slow start capacitor should
remain lower than 0.47mF and greater than 0.47nF.
(6)
At power up, the TPS54160 does not start switching until the slow start pin is discharged to less than 40 mV to
ensure a proper power up, see Figure 31.
Also, during normal operation, the TPS54160 stops switching and the SS/TR must be discharged to 40 mV,
when the VIN UVLO is exceeded, EN pin pulled below 1.25V, or a thermal shutdown event occurs.
The VSENSE voltage follows the SS/TR pin voltage with a 45mV offset up to 85% of the internal voltage
reference. When the SS/TR voltage is greater than 85% on the internal reference voltage the offset increases as
the effective system reference transitions from the SS/TR voltage to the internal voltage reference (see
Figure 23). The SS/TR voltage ramps linearly until clamped at 1.7V.
Figure 31. Operation of SS/TR Pin when Starting
Overload Recovery Circuit
The TPS54160 has an overload recovery (OLR) circuit. The OLR circuit slow starts the output from the overload
voltage to the nominal regulation voltage once the fault condition is removed. The OLR circuit discharges the
SS/TR pin to a voltage slightly greater than the VSENSE pin voltage using an internal pull down of 100 mA when
the error amplifier is changed to a high voltage from a fault condition. When the fault condition is removed, the
output slow-starts from the fault voltage to nominal output voltage.
16
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54160
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