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| 型号： | TPS59116RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, VQFN-24 |
| 文件页数： | 4/36页 |
| 文件大小： | 827K |
| 代理商： | TPS59116RGET |
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VOCL
VVDDQ
VPGOOD
VS5
80%
87%
100%
85
s
45
s
UDG04066
VDDQ
VDDQSS
VDDQOCP
2 C
V
0.8
t
85 s
I
=
+
m
VTT
VTTSS
VTTOCL
C
V
t
I
=
TI Information — Selective Disclosure
SLUSA57 – NOVEMBER 2010
www.ti.com
Soft-Start and Powergood
The soft start function of the SMPS is achieved by ramping up reference voltage and two-stage current clamp. At
the starting point, the reference voltage is set to 650 mV (87% of its target value) and the overcurrent threshold
is set half of the nominal value. When UVP comparator detects VDDQ become greater than 80% of the target,
the reference voltage is raised toward 750 mV using internal 4-bit DAC. This takes approximately 85 ms. The
overcurrent threshold is released to nominal value at the end of this period. The powergood signal waits another
45 ms after the reference voltage reaches 750 mV and the VDDQ voltage becomes good (above 95% of the
target voltage), then turns off powergood open-drain MOSFET.
The soft-start function of the VTT LDO is achieved by current clamp. The current limit threshold is also changed
in two stages using an internal powergood signal dedicated for LDO. During VTT is below the powergood
threshold, the current limit level is cut into 60% (2.2 A).This allows the output capacitors to be charged with low
and constant current that gives linear ramp up of the output. When the output comes up to the good state, the
overcurrent limit level is released to normal value (3.8 A). TPS59116 has an independent counter for each
output, but the PGOOD signal indicates only the status of VDDQ and does not indicate VTT powergood
externally. See Figure 1.
Figure 1. VDDQ Soft-Start and Powergood Timing
Soft-start duration, TVDDQSS, TVTTSS are functions of output capacitances.
where
(2)
where
IVTTOCL = 2.2 A (typ)
(3)
In each of the two previous calculations, no load current during start-up are assumed. Note that both switchers
and the LDO do not start up with full load condition.
12
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS59116
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