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參數(shù)資料
| 型號(hào)： | LTC3721EUF-1 |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Push-Pull PWM Controller |
| 中文描述： | 推挽式PWM控制器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 192K |
| 代理商： | LTC3721EUF-1 |
LTC3721-1
12
sn37211 37211fs
OPERATIOU
Leading Edge Blanking
The LTC3721-1 provides programmable leading edge
blanking to prevent nuisance tripping of the current sense
circuitry. Leading edge blanking relieves the filtering re-
quirements for the CS pin, greatly improving the response
to real overcurrent conditions. It also allows the use of a
ground referenced current sense resistor or transformer(s),
further simplifying the design. With a single 10k to 100k
resistor from R
LEB
to GND, blanking times of approxi-
mately 40ns to 320ns are programmed. If not required,
connecting R
LEB
to V
REF
can disable leading edge blank-
ing. Keep in mind that the use of leading edge blanking will
slightly reduce the linear control range for the pulse width
modulator.
High Current Drivers
The LTC3721-1 high current, high speed drivers provide
direct drive of external power N-channel MOSFET switches.
The drivers swing from rail to rail. Due to the high pulsed
current nature of these drivers (1.5A sink, 1A source), care
must be taken with the board layout to obtain advertised
performance. Bypass V
CC
with a 1
μ
F minimum, low ESR,
ESL ceramic capacitor. Connect this capacitor with mini-
mal length PCB leads to both V
CC
and GND. A ground plane
is highly recommended. The driver output pins (DRVA,
DRVB) connect to the gates of the external MOSFET
switches. The PCB traces making these connections should
also be as short as possible to minimize overshoot and
undershoot of the drive signal.
Transformer Configurations
The LTC3721-1 used in a typical isolated push-pull con-
verter application will need a transformer to provide the
voltage translation and galvanic isolation. The push-pull
transformer employs a center tapped primary winding
configuration. The transformer secondary can be center
tapped or a single winding depending on the configuration
and application needs.
Center tapped secondary configurations apply alternating
<50% duty cycle square waves to a single inductor/
capacitor combination. This L-C circuit filters the square
wave and produces the regulated output voltage. The
secondary square wave amplitude is given by:
V
SEC
= V
IN
N, where N = Ns/Np, transformer turns
ratio, # of secondary turns divided by # of primary
turns.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3721EUF-1#PBF | 功能描述:IC REG CTRLR ISO PWM CM 16-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 |
| LTC3721EUF-1#TR | 功能描述:IC REG CTRLR ISO PWM CM 16-QFN RoHS:否 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 |
| LTC3721EUF-1#TRPBF | 功能描述:IC REG CTRLR ISO PWM CM 16-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 |
| LTC3722EGN-1 | 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:否 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 |
| LTC3722EGN-1#PBF | 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP 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:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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