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參數資料
| 型號： | XRP7740ILB-0X18-F |
| 廠商： | Exar Corporation |
| 文件頁數： | 21/28頁 |
| 文件大小： | 1610K |
| 描述： | IC REG 5OUT BCK/LINEAR 40TQFN |
| 標準包裝： | 98 |
| 系列： | PowerXR |
| 拓撲： | 降壓（降壓）同步（4），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數： | 5 |
| 頻率 - 開關： | 1.5MHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 控制器 |
| 電壓/電流 - 輸出 3： | 控制器 |
| 帶 LED 驅動器： | 無 |
| 帶監控器： | 無 |
| 帶序列發生器： | 是 |
| 電源電壓： | 6.5 V ~ 20 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 40-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 40-TQFN（6x6） |
| 包裝： | 托盤 |
| 其它名稱： | 1016-1697 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁當前第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
X
X
R
R
P
P
7
7
7
7
0
0
8
8
a
a
n
n
d
d
X
X
R
R
P
P
7
7
7
7
4
4
0
0
Q
Q
u
u
a
a
d
d
C
C
h
h
a
a
n
n
n
n
e
e
l
l
D
D
i
i
g
g
i
i
t
t
a
a
l
l
P
P
W
W
M
M
S
S
t
t
e
e
p
p
D
D
o
o
w
w
n
n
C
C
o
o
n
n
t
t
r
r
o
o
l
l
l
l
e
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r
r
s
s
?2012 Exar Corporation
21/28
Rev. 1.2.2
appropriate bit combination the user can configure the IC to function as a master or a slave when
two or more XRP7708s are used to convert power in a system. Automatic clock selection is also
provided to allow operation even if the external clock fails by switching the IC back to an internal
clock.
External Clock Synchronization
Even when configured to use an external clock, the chip initially powers up with its internal clock.
The user can set the percent target that the frequency detector will use when comparing the
internal clock with the clock frequency input on the GPIO pin. If the external clock frequency is
detected to be within the window specified by the user, then a switchover will occur to the external
clock. If the IC does not find a clock in the specified frequency target range then the external clock
will not be used and the IC will run on the internal clock that was specified by the user. If the
external clock fails the user can chose to have the internal clock take over, using the automatic
switch back mode in the SET_SYNC_MODE_CONFIG register.
XRP7708
Configured for
external clock use
CLK_IN
GPIO1
Fig. 22:XRP7708 Configured For External Clock Use
Synchronized Operation as a Master and Slave Unit
Two XRP7708s can be synchronized together. This Master-Slave configuration is described below.
" Master
When the XRP7708 powers up as a master unit after the internal configuration memory is loaded
the unit will send CLK_OUT and SYNC_OUT signals to the slave on the preconfigured GPIO pins.
" Slave
When powering in sync mode the slave unit will initially power up with its internal clock to transfer
the configuration memory. Once this transfer occurs, then the unit is set to function as a slave unit.
In turn the unit will take the external clock provided by the master to run as its main internal clock.
GPIO2
GPIO2
XRP7708
configured
as a master
XRP7708
configured
as a slave
CLK_OUT
SYNC_OUT
SYNC_IN
CLK_IN
GPIO1
GPIO1
Fig. 23: Master/Slave Configuration of the XRP7708
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