- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄47 > XRP7740ILBTR-F (Exar Corporation)IC REG 5OUT BCK/LINEAR 40TQFN Datasheet資料下載
參數(shù)資料
| 型號(hào)： | XRP7740ILBTR-F |
| 廠商： | Exar Corporation |
| 文件頁(yè)數(shù)： | 19/28頁(yè) |
| 文件大?。?/td> | 1610K |
| 描述： | IC REG 5OUT BCK/LINEAR 40TQFN |
| 產(chǎn)品變化通告： | Packing Change 15/Oct/2010 |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 系列： | PowerXR |
| 拓?fù)洌?/td> | 降壓（降壓）同步（4），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 5 |
| 頻率 - 開(kāi)關(guān)： | 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(qū)動(dòng)器： | 無(wú) |
| 帶監(jiān)控器： | 無(wú) |
| 帶序列發(fā)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(yīng)商設(shè)備封裝： | 40-TQFN（6x6） |
| 包裝： | 帶卷 (TR) |
| 配用： | 1016-1352-ND - EVAL BOARD FOR XRP7740 1016-1344-ND - IN-SOCKET PROG BRD VIA USB/GUI |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)當(dāng)前第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)
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
e
r
r
s
s
?2012 Exar Corporation
19/28
Rev. 1.2.2
POWER GOOD FLAG
The XRP7708 allows the user to set the upper and lower bound for a power good signal per
channel. The SET_PWRG_TARG_MAX_CHx register sets the upper bound, the
SET_PWRG_TARG_MIN_CHx register sets the lower bound. Each register has a 20mV LSB
resolution. When the output voltage is within bounds the power good signal is asserted high.
Typically the upper bound should be lower than the over-voltage threshold. In addition, the power
good signal can be delayed by a programmable amount set in the SET_PWRGD_DLY_CHx register.
The power good delay is only set after the soft-start period is finished. If the channel has a pre-
charged condition that falls into the power good region, a power good flag is not set until the soft-
start is finished.
PWM SWITCHING FREQUENCY
The PWM switching frequency is set by choosing the corresponding oscillator frequency and clock
divider ratio in the SET_SW_FREQUENCY register. Bits [6:4] set the oscillator frequency and bits
[2:0] set the clock divider. The tables below summarize the available Main Oscillator and PWM
switching frequency settings in the XRP7708.
Main Oscillator Frequency
SET_SW_FREQUENCY[6:4]
000
001
010
011
100
101
110
111
4 MHz 44. MHz 41. MHz
.4MHz
.2MHz
2MHz 2 . Mhz
2 . MHz
Ts
20.8ns 22.3ns
24ns
26ns
28.4ns 31.25ns 34.7ns
39ns
PWM Switching Frequency
SET_SW_FREQUENCY[6:4]
SET_SW_FREQUENCY[2:0]
000
001
010
011
100
101
110
111
NA
NA
NA
NA
NA
NA
NA
NA
1. MHz 1.4MHz 1. MHz 1.2MHz 1.1MHz 1. MHz
KHz
800KHz
1. MHz
KHz
7KHz
KHz 7 KHz
7KHz
KHz
KHz
011
750KHz 700KHz 650KHz 600KHz 550KHz 500KHz 450KHz 400KHz
1
600KHZ 560KHz 520KHz 480KHz 440KHz 400KHz 360KHz 320KHz
1 1
500KHz 467KHZ 433KHz 400KHz 367KHz 333KHz 300KHz
NA
42 KHZ 4 KHZ
7 KHz
4 KHz
14KHz
NA
NA
NA
111
375KHz 350KHz 325KHz 300KHz
NA
NA
NA
NA
There are a number of options that could result in similar PWM switching frequency as shown
above. In general, the chip consumes less power at lower oscillator frequency. When
synchronization to external clock is needed, the user can choose the oscillator frequency to be
within +/- 5% of the external clock frequency. A higher Main Oscillator frequency will not improve
accuracy or any performance efficiency.
PWM SWITCHING FREQUENCY CONSIDERATIONS
There are several considerations when choosing the PWM switching frequency.
Minimum On Time
Minimum on time determines the minimum duty cycle at the specific switching frequency. The
minimum on time for the XRP7708 is 40ns.
55V5[5V5Z5b5Z 575b5a5f 565f5P5Y5R% = 5@5V5[5V5Z5b5Z 5\5[5a5V5Z5R ?5C5J5@ 595_5R5^5b5R5[5P5f ?100
As an example the minimum duty cycle is 4% for 1MHz PWM frequency. This is important since the
minimum on time dictates the maximum conversion ratio that the PWM controller can achieve.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZDS1009TA | IC CURRENT MIRROR SOT223-8 |
| ZXCT1008FTA | IC CURRENT MONITOR 1% SOT23-3 |
| ZXCT1009T8TA | IC CURRENT MONITOR 1% SM8 |
| ZXCT1010E5TA | IC CURRENT MONITOR 1% SOT-23-5 |
| ZXCT1011E5TA | IC CURRENT MONITOR 1% SOT23-5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRP77XXEVB-XCM | 功能描述:EVAL BOARD W/USB-I2C FOR XRP7704 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| XRP77XXEVB-XPM | 功能描述:電源管理IC開(kāi)發(fā)工具 XRP77XXEVB-XPM RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| XRP9710EVB | 制造商:Exar Corporation 功能描述:Evaluation Board for the XRP9710 Series Dual 6 A Programmable Power Module 制造商:Exar Corporation 功能描述:XRP9710 eval |
| XRP9710EVB-DEMO-1 | 功能描述:XRP9710 - DC/DC, Step Down 2, Non-Isolated Outputs Evaluation Board 制造商:exar corporation 系列:- 零件狀態(tài):有效 主要用途:DC/DC，步降 輸出和類型:2，非隔離 功率 - 輸出:- 電壓 - 輸出:1.8V，2.5V 電流 - 輸出:6A，6A 電壓 - 輸入:5.5 V ~ 22 V 穩(wěn)壓器拓?fù)?降壓 頻率 - 開(kāi)關(guān):- 板類型:完全填充 所含物品:板 使用的 IC/零件:XRP9710 標(biāo)準(zhǔn)包裝:1 |
| XRP9710EY-F | 制造商:Exar Corporation 功能描述:Dual 6Amp Programmable Power Module |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。