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參數(shù)資料
| 型號(hào)： | LT1930A |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters |
| 中文描述： | 第1A，1.2MHz/2.2MHz，升壓型DC / DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | LT1930A |
4
LT1930/LT1930A
BLOCK DIAGRA
Figure 2. Block Diagram
OPERATIOU
The LT1930 uses a constant frequency, current-mode
control scheme to provide excellent line and load regula-
tion. Operation can be best understood by referring to the
block diagram in Figure 2. At the start of each oscillator
cycle, the SR latch is set, which turns on the power switch
Q1. A voltage proportional to the switch current is added
to a stabilizing ramp and the resulting sum is fed into the
positive terminal of the PWM comparator A2. When this
voltage exceeds the level at the negative input of A2, the SR
latch is reset turning off the power switch. The level at the
negative input of A2 is set by the error amplifier A1, and is
simply an amplified version of the difference between the
feedback voltage and the reference voltage of 1.255V. In
this manner, the error amplifier sets the correct peak
current level to keep the output in regulation. If the error
amplifier’s output increases, more current is delivered to
the output; if it decreases, less current is delivered. The
LT1930 has a current limit circuit not shown in Figure 2.
The switch current is constantly monitored and not al-
lowed to exceed the maximum switch current (typically
1.2A). If the switch current reaches this value, the SR latch
is reset regardless of the state of comparator A2. This
current limit helps protect the power switch as well as the
external components connected to the LT1930.
The block diagram for the LT1930A (not shown) is iden-
tical except that the oscillator frequency is 2.2MHz.
–
+
–
+
R
Q
S
0.01
SW
DRIVER
COMPARATOR
2
SHDN
4
1
V
IN
5
FB
3
–
+
Σ
RAMP
GENERATOR
1.255V
REFERENCE
R
C
C
C
1.2MHz
OSCILLATOR*
GND
1930/A BD
Q1
A2
A1
R1 (EXTERNAL)
R2 (EXTERNAL)
FB
V
OUT
SHUTDOWN
*2.2MHz FOR LT1930A
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| LT1930AES5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters |
| LT1930AES5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.45V to 16V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.45V to 16V 5-Pin TSOT-23 Bulk 制造商:Linear Technology 功能描述:IC STEP-UP DC/DC CONVERTER 5-SOT-23 制造商:Linear Technology 功能描述:IC, STEP-UP DC/DC CONVERTER, 5-SOT-23 制造商:Linear Technology 功能描述:IC, STEP-UP DC/DC CONVERTER, 5-SOT-23; Primary Input Voltage:16V; No. of Outputs:1; Output Voltage:34V; Output Current:250mA; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LT1930AES5#TR | 功能描述:IC REG BOOST ADJ 1A TSOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1930AES5#TRM | 功能描述:IC REG BOOST ADJ 1A TSOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1930AES5#TRMPBF | 功能描述:IC REG BOOST ADJ 1A TSOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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