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參數(shù)資料
| 型號(hào)： | LT3420 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Photoflash Capacitor Chargers with Automatic Refresh |
| 中文描述： | 照相閃光燈電容充電器，具有自動(dòng)刷新 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 368K |
| 代理商： | LT3420 |
LT3420/LT3420-1
14
3420fa
risk of drawing too much current from the battery. The
input current to the LT3420/LT3420-1 circuit can be
adjusted by driving the CHARGE pin with a PWM (pulse
width modulation) signal. The microprocessor can adjust
the duty cycle of the PWM signal to achieve the desired
level of input current. Many schemes exist to achieve this
function. Once the target output voltage is reached, the
PWM signal should be halted to avoid overcharging the
photoflash capacitor, since the signal at the CHARGE pin
overrides the refresh timer.
A simple method to achieve adjustable input current is
shown in Figure 9. The PWM signal has a frequency of
1kHz. When ON is logic high, the circuit is enabled and the
CHARGE pin is driven by the PWM signal. When the target
output voltage is reached, DONE goes high while CHARGE
is also high. The output of A1 goes high, which forces
CHARGE high regardless of the PWM signal. The part is
now in the Refresh mode. Once the refresh period is over,
the DONE pin goes low, allowing the PWM signal to drive
the CHARGE pin once again. This function can be easily
implemented in a microcontroller. Figure 10 shows the
input current for the LT3420 and LT3420-1 as the duty
cycle of the PWM signal is varied.
APPLICATIOU
W
U
U
Figure 9. Simple Logic for Adjustable Input Current
Figure 10. Input Current as Duty Cycle is Varied
A1
A3
3420 F09
A2
TO
LT3420
CIRCUIT
CHARGE
DONE
ON
1kHz PWM
SIGNAL
I
DUTY CYCLE (%)
90
3420 F10
10
800
LT3420
LT3420-1
0
30
50
70
400
200
600
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3526 | Regulating Pulse Width Modulator |
| LT3526J | Regulating Pulse Width Modulator |
| LT3526N | Regulating Pulse Width Modulator |
| LT1526 | Octal Bus Transceivers 20-SOIC 0 to 70 |
| LT1526J | Octal Bus Transceivers 20-SOIC 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3420-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Photoflash Capacitor Chargers with Automatic Refresh |
| LT3420EDD#PBF | 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LT3420EDD#TR | 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Photoflash Capacitor Charger w/ Automatic Top-Off |
| LT3420EDD#TRPBF | 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| LT3420EDD-1#PBF | 功能描述:IC PHOTOFLASH CAP CHARGER 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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