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ACT4910QW データシート(PDF) 23 Page - Active-Semi, Inc

部品番号 ACT4910QW
部品情報  Power Loss Protection with 6A eFuse
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メーカー  ACTIVE-SEMI [Active-Semi, Inc]
ホームページ  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT4910QW データシート(HTML) 23 Page - Active-Semi, Inc

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ACT4910QW
Rev 1.0, 15-Sept-2017
Innovative PowerTM
www.active-semi.com
ActiveSwitcherTM is a trademark of Active-Semi
Copyright © 2017 Active-Semi, Inc.
23
Where Vripple is the desired output ripple voltage, FSW is
the switching frequency in Hz, and ΔIL is the maximum
ripple current in Amperes.
As with the input capacitor selection, use X5R or X7R
dielectrics and be sure to consider the capacitor’s DC
bias effects.
Storage Boost Converter
General Description
The ACT4910 contains an integrated peak current-
mode, synchronous boost converter. It minimizes
system level costs by using the same components as
the buck converter. The peak current is adjustable
between 250mA and 950mA, allowing for system
optimization. The output voltage is adjustable between
5V and 36V via I2C registers and an external resistor.
The peak current-mode control topology eliminates the
need for compensation. The boost automatically
charges up the storage capacitors from the input
voltage so they are ready to provide backup power in
the event of a system fault.
Startup
The boost converter automatically starts when the IC
exits the SOFTSTART state. Note that the IC exits the
SOFTSTART state 10ms after the output voltage is
within 200mV of the input voltage.
When the storage voltage reaches regulation, the boost
enters standby mode and monitors the storage voltage.
It automatically turns back on and “tops off” the storage
capacitors when the storage voltage drops below 95%
of the programmed voltage. The boost converter
automatically turns off if it is “topping off” the storage
capacitors when the IC enters supplement mode.
The average input current when the boost charges the
storage capacitors is approximately ½ of the peak
switching current. The peak switch current is programed
by register BST_CLIM[1:0].
Table 4: Boost Peak Current Settings
BST_CLIM[1:0]
(mA)
00
250
01
650
10
950
11
1500
Operating Mode
The boost converter operates in peak current mode,
non-fixed frequency mode. The power FET stays on
until its current reaches programmed peak current. It
then turns off until the inductor current drops to 0A, at
which time it turns on again.
Storage Capacitor Voltage Setting
The buck converter output voltage is set by either the
I2C register BSTVSET[4:0], or a combination the
register and a resistor placed between the BSET pin to
VSS.
When using only the BSTVSET[4:0] leave the BSET pin
floating. Table 5 shows the programmed storage voltage.
The default value is determined by the IC’s specific CMI
option.
Table5: Storage Capacitor Voltage Settings with
BSET Pin Open
BSTVSET[3:0]
BSTVSET[4]
0
1
0000
5V
21V
0001
5.6V
22V
0010
7V
23V
0011
8V
24V
0100
9V
25V
0101
10V
26V
0110
11V
27V
0111
12V
28V
1000
13V
29V
1001
14V
30V
1010
15V
31V
1011
16V
32V
1100
17V
33V
1101
18V
34V
1110
19V
35V
1111
20V
36V
Using both the BSTVSET[4:0] register and an external
resistor provides additional output voltage resolution. In
this configuration, the following equation calculates the
output voltage.
Equation 8
Where VBSTVSET is the voltage set by the BSTVSET
register in Table 5 and RBSET is the resistor on the BSET
pin in ohms.


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