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SC453TSTRT Arkusz danych(PDF) 17 Page - Semtech Corporation

Numer części SC453TSTRT
Szczegółowy opis  Portable, VID Programmed Single Phase Power Supply Controller
PDF  26 Pages
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Producent  SEMTECH [Semtech Corporation]
Strona internetowa  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC453TSTRT Arkusz danych(HTML) 17 Page - Semtech Corporation

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© 2009 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC453
LOAD RELEASE
The worst-case for the transient load release is when the
hysteresis has just reached the maximum, (i.e. the high-
side switch has just turned of ). At this time the inductor
has reached its peak current as calculated below.
IRIPPLE
VINMAX VMAX_F
−
(
L1 FS
⋅
:=
It0
IMAX
:=
The load is stepping from high to low.
Immediately after the load steps down from I
MAX
to I
MIN
, the
high side FET is turned off, and the bottom FET is turned
on after the dead time. It is assumed for the worst-case
condition that at t = 0, the inductor current is initially at its
maximum;. After t = 0, the inductor discharges at a rate
equal to V
FL
/ L (ignoring secondary order effects such as
Rds_on drop, current sense resistor and copper losses).
The energy released from the output inductor during load
step-down, charges the output capacitors and is dissi-
pated through the following means: Rds_on, Rcs, Rcu,
Rcu_rt, ESR of the output capacitors and load.
Applications Information (Cont.)
Since the output inductor is discharging at a fixed rate,
there are two terms contributing to the increase of the
voltage on the output capacitors: 1) is due to the ESR of
the output capacitor; 2) is due to the added charge con-
tributed by the inductor current.
VESR tNCAP
,
() I
CAP t
()
RESR
NCAP
⋅
:=
dVCAP tNCAP
,
()
ICAP t
()t
⋅
COUT NCAP
⋅
:=
VTOTAL tNCAP
,
() V
ESR tNCAP
,
() dV
CAP tNCAP
,
()
+
:=
The chart above shows the system response for the ca-
pacitors defined in Step 1 and the chart to follow shows
the details of the response for the chosen number of out-
put capacitors.
LRDS
RCU
ESR_eq
IMAX
IMIN
Cout_eq
Rcu_rt
Rds_ON
BG
R_LOAD
t0 10 n s
⋅
,
10
μ s
⋅
..
:=
IL t
()
It0
VMAX_FL t
⋅
L1
−
⎛
⎜
⎝
⎞
⎠
:=
ICAP t
()
IL t
()
ILKGMAX
−
:=
RIPPLE
6.01 A
=
It0
23.005 A
=



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