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參數(shù)資料
| 型號： | LTC4090EDJC#TRPBR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO22 |
| 封裝： | 6 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WXXX, DFN-22 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 392K |
| 代理商： | LTC4090EDJC#TRPBR |
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LTC4090
19
4090f
APPLICATIONS INFORMATION
minimum switch-off time (~150ns). These equations show
that duty cycle range increases when switching frequency
is decreased.
A good choice of switching frequency should allow ad-
equate input voltage range (see next section) and keep
the inductor and capacitor values small.
HVIN Input Voltage Range
The maximum input voltage range for the LTC4090 appli-
cations depends on the switching frequency, the Absolute
Maximum Ratings of the VHVIN and BOOST pins, and the
operating mode.
The high voltage switching regulator can operate from
input voltages up to 38V, and safely withstand input volt-
ages up to 60V. Note that while VHVIN > 41.5V (typical),
the LTC4090 will stop switching, allowing the output to
fall out of regulation.
While the high voltage regulator output is in start-up,
short-circuit, or other overload conditions, the switching
frequency should be chosen according to the following
discussion.
For safe operation at inputs up to 60V the switching fre-
quency must be low enough to satisfy VHVIN(MAX) ≥ 45V
according to the following equation. If lower VHVIN(MAX)
is desired, this equation can be used directly.
V
VV
ft
VV
HVIN MAX
HVOUT
D
SW
ON MIN
DSW
()
–
=
+
where VHVIN(MAX) is the maximum operating input voltage,
VHVOUT is the high voltage regulator output voltage, VD is
the catch diode drop (~0.5V), VSW is the internal switch
drop (~0.5V at max load), fSW is the switching frequency
(set by RT), and tON(MIN) is the minimum switch-on time
(~150ns). Note that a higher switching frequency will de-
press the maximum operating input voltage. Conversely,
a lower switching frequency will be necessary to achieve
safe operation at high input voltages.
If the output is in regulation and no short-circuit, start-
up, or overload events are expected, then input voltage
transients of up to 60V are acceptable regardless of the
switching frequency. In this mode, the LTC4090 may enter
pulse skipping operation where some switching pulses are
skipped to maintain output regulation. In this mode the
output voltage ripple and inductor current ripple will be
higher than in normal operation. Above 41.5V, switching
will stop.
The minimum input voltage is determined by either the high
voltage regulator’s minimum operating voltage of ~6V or by
its maximum duty cycle (see equation in previous section).
The minimum input voltage due to duty cycle is:
V
VV
ft
VV
HVIN MIN
HVOUT
D
SW OFF MIN
DSW
()
=
+
+
1
where VHVIN(MIN) is the minimum input voltage, and
tOFF(MIN) is the minimum switch off time (150ns). Note
that higher switching frequency will increase the minimum
input voltage. If a lower dropout voltage is desired, a lower
switching frequency should be used.
Inductor Selection and Maximum Output Current
A good choice for the inductor value is L = 6.8μH (as-
suming a 600kHz operating frequency). With this value
the maximum load current will be 2A. The RMS current
rating of the inductor must be greater than the maximum
load current and its saturation current should be about
30% higher. Note that the maximum load current will be
programmed charge current plus the largest expected
application load current. For robust operation in fault
conditions, the saturation current should be ~3.5A. To
keep efciency high, the series resistance (DCR) should
be less than 0.1Ω. Table 2 lists several vendors and types
that are suitable.
Catch Diode
Table 2. Inductor Vendors
VENDOR URL
PART SERIES
TYPE
Murata
www.murata.com
LQH55D
Open
TDK
www.componenttdk.com
SLF7045
SLF10145
Shielded
Toko
www.toko.com
D62CB
D63CB
D75C
D75F
Shielded
Open
Sumida
www.sumida.com
CR54
CDRH74
CDRH6D38
CR75
Open
Shielded
Open
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