- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377763 > LTC1772B (Linear Technology Corporation) Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 PDF資料下載
參數(shù)資料
| 型號： | LTC1772B |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 |
| 中文描述： | 恒定頻率電流模式降壓DC / DC控制器，采用SOT - 23 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 196K |
| 代理商： | LTC1772B |
4
LTC1772B
FU
CTIO
AL DIAGRW
U
U
OPERATIOU
Main Control Loop
The LTC1772B is a constant frequency current mode
switching regulator. During normal operation, the external
P-channel power MOSFET is turned on each cycle when
the oscillator sets the RS latch (RS1) and turned off when
the current comparator (ICMP) resets the latch. The peak
inductor current at which ICMP resets the RS latch is
controlled by the voltage on the I
TH
/RUN pin, which is the
output of the error amplifier EAMP. An external resistive
divider connected between V
OUT
and ground allows the
EAMP to receive an output feedback voltage V
FB
. When the
(Refer to Functional Diagram)
load current increases, it causes a slight decrease in V
FB
relative to the 0.8V reference, which in turn causes the
I
TH
/RUN voltage to increase until the average inductor
current matches the new load current.
The main control loop is shut down by pulling the I
TH
/RUN
pin low. Releasing I
TH
/RUN allows an internal 0.5
μ
A
current source to charge up the external compensation
network. When the I
TH
/RUN pin reaches 0.35V, the main
control loop is enabled with the I
TH
/RUN voltage then
pulled up to its zero current level of approximately 0.85V.
As the external compensation network continues to charge
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
–
+
–
+
0.5
μ
A
0.3V
OVP
SHORT-CIRCUIT
DETECT
SHDN
1.2V
UV
1772FD
V
REF
+
60mV
V
0.8V
V
IN
RS1
R
VOLTAGE
REFERENCE
SLOPE
COMP
ICMP
S
Q
FREQ
FOLDBACK
OSC
SENSE
–
V
IN
5
2
4
–
+
EAMP
V
FB
3
–
+
PGATE
V
IN
6
I
TH
/RUN
V
IN
0.35V
V
0.8V
1
–
+
SHDN
CMP
GND
–
+
UNDERVOLTAGE
LOCKOUT
15mV
相關PDF資料 |
PDF描述 |
|---|---|
| LTC1772BES6 | Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 |
| LTC1772CS6 | Quadruple 2-Input Positive-NAND Gate 14-SOIC -40 to 85 |
| LTC1772 | Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 |
| LTC1773 | Synchronous Step-Down Regulator Controller(同步步降穩(wěn)壓器) |
| LTC1775C | Quadruple 2-Input Positive-NAND Gate 14-TVSOP -40 to 85 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1772BES6 | 制造商:Linear Technology 功能描述:IC CTRLR DC/DC S-DWN SOT23-6 |
| LTC1772BES6#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.5V to 9.8V Input 6-Pin TSOT-23 制造商:Linear Technology 功能描述:DC-DC CONTROLLER BUCK 5A TS 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 5A, TSOT-23-6; Primary Input Voltage:9.8V; No. of Outputs:1; Output Current:5A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-TSOT-23; Supply Voltage Max:9.8V;RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 5A, TSOT-23-6; Primary Input Voltage:9.8V; No. of Outputs:1; Output Current:5A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-TSOT-23 ;RoHS Compliant: Yes |
| LTC1772BES6#TR | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| LTC1772BES6#TRM | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| LTC1772BES6#TRMPBF | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 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 標準包裝: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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。