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參數(shù)資料
| 型號(hào)： | LTC3785EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220WGGD, QFN-24 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大小： | 275K |
| 代理商： | LTC3785EUF |
LTC3785
3785fc
operaTion
To have the power converter latch off on a fault, a pull-up
current between 4A and 7A on the RUN/SS pin will allow
the RUN/SS capacitor to discharge during an extended
fault,butwillpreventcyclingofthefaultwhichwillcausethe
converter to stay off. One method to implement this is by
placingadiode(anodetiedtoVOUT)andaresistorfromVOUT
totheRUN/SSpin.ThecurrentsourcedintoRUN/SSwillbe
VOUT – 0.7 divided by the resistor value. To ignore all faults
sourcegreaterthan40AintotheRUN/SSpin(At1.225Von
theRUN/SSpin).Sincethemaximumfaultcurrentislimited,
this will prevent any discharging of the RUN/SS capacitor,
the soft-start capacitor will need to be sized accordingly to
accommodatetheextrachargingcurrentatstart-up.
During an output short-circuit or if VOUT is less than 1.8V,
the current limit folds back to 50% of the programmed
level.
REVERSE CURRENT LIMIT
The LTC3785 can be programmed to provide full class D
operation or allowed to source and sink current equal to
the current limit set value. This is achieved by asserting a
high level on the CCM pin. To minimize the reverse output
current, the CCM pin should be driven low or strapped to
ground. During this mode only, –15mV typical is allowed
across output switch D and is sensed with the ISVOUT and
ISSW2pins.
Figure 3. Block Diagram of Current Limit Fault Circuitry
+
–
+
–
+
–
+
–
+
–
+
–
gm
gm = 1/20k
ILIMIT COMP
IMAX COMP
TURN
SWITCHES
B AND D ON
V = 60k/RILSET
(15k/RILSET WHEN VOUT < 1.8V)
X10
V = 90k/RILSET
0.7V
2A
2.2V
CSS
1/3 ILIM(OUT)
10A MAX
ILIM(OUT)
30A MAX
1A
RUN/SS
VOUT
FB
R1
R2
ILIM COMP
IMAX COMP
VC
CP1
1.225V
THERMAL SD
RUN
FAULT
LOGIC
ILIMIT
SET
SAMPLED
REVERSE
CURRENT LIMIT
CCM = HIGH = 6k/RILSET
CCM = LOW = 15mV
ISVIN
VIN
VOUT
COUT
L1
TG1
SW1
SW2
A
B
D
C
ISSW2
ISSW1
CCM
ISVOUT
+
–
TG2
3785 F03
SWITCH D
OFF
1.225V
ERROR AMP
+
–
ILSET
RILSET
BG1
BG2
S
1
4
3
2
5
15
14
13
12
10
6
17
18
19
20
22
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC3785EUF#PBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC3785EUF#TRPBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3785EUF-1#PBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3785EUF-1#TRPBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3785EUFPBF | 制造商:Linear Technology 功能描述:10V Synch Buck-Boost Controller LTC3785 |
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