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参数资料
| 型号： | LTC3722IGN-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIV ISO PWM 24SSOP |
| 标准包装： | 55 |
| PWM 型： | 电流模式，全桥 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 98.5% |
| 电源电压： | 3.8 V ~ 10.3 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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LTC3722-1/LTC3722-2
OPERATION
R2
R1
R1 =
= 15k
= 465k
R2 =
network to implement. If there is not enough energy to
fully commutate the bridge leg to a ZVS condition, the
LTC3722-1/LTC3722-2 automatically overrides the Di-
rectSense circuitry and forces a transition. The override
or default delay time is programmed with a resistor from
DPRG to V REF .
Adaptive Mode
The LTC3722-1/LTC3722-2 are configured for adaptive
delay sensing with three pins, ADLY, PDLY and SBUS.
ADLY and PDLY sense the active and passive delay legs
respectively via a voltage divider network, as shown in
Figure 2.
V IN
A C
SBUS ADLY
R5 R6
PDLY
B D
R3 R4
1k 1k
R CS
372212 F02
Figure 2. Adaptive Mode
The threshold voltage on PDLY and ADLY for both the ris-
ing and falling transitions is set by the voltage on SBUS.
A buffered version of this voltage is used as the threshold
level for the internal DirectSense circuitry. At nominal V IN ,
the voltage on SBUS is set to 1.5V by an external voltage
divider between V IN and GND, making this voltage directly
proportional to V IN . The LTC3722-1/LTC3722-2 DirectSense
circuitry uses this characteristic to zero voltage switch
all of the external power MOSFETs, independent of input
voltage.
delays exist between the time at which the LTC3722-1/
LTC3722-2 controller output transitions, to the time at
which the power MOSFET switches on due to MOSFET
turn-on delay and external driver circuit delay. Ideally, we
want the power MOSFET to switch at the instant there
is zero volts across it. By setting a threshold voltage for
ADLY and PDLY corresponding to several volts across the
MOSFET, the LTC3722-1/LTC3722-2 can anticipate a zero
voltage VDS and signal the external driver and switch to
turn-on. The amount of anticipation can be tailored for
any application by modifying the upper divider resistor(s).
The LTC3722-1/LTC3722-2 DirectSense circuitry sources
a trimmed current out of PDLY and ADLY (proportional
to SBUS) after a low to high level transition occurs. This
provides hysteresis and noise immunity for the PDLY and
ADLY circuitry, and sets the high to low threshold on ADLY or
PDLY to nearly the same level as the low to high threshold,
thereby making the upper and lower MOSFET VDS switch
points virtually identical, independent of V IN .
Example: V IN = 48V nominal (36V to 72V)
1. Set up SBUS: 1.5V is desired on SBUS with V IN = 48V.
Set divider current to 100μA.
1.5V
100μA
48V ? 1.5V
100μA
An optional small capacitor (0.001μF) can be added
across R1 to decouple noise from this input.
2. Set up ADLY and PDLY: 7V of anticipation is desired
in this circuit to account for the delays of the external
MOSFET driver and gate drive components.
R3, R4 = 1k, sets a nominal 1.5mA in the divider chain
at the threshold.
R5, R6 =
ADLYandPDLYareconnectedthroughvoltagedividersto
the active and passive bridge legs respectively. The lower
resistor in the divider is set to 1k. The upper resistor in
the divider is selected for the desired positive transition
trip threshold.
(48V ? 7V ? 1.5V)
1.5mA
use (2) equal 13k segments.
= 26.3k,
To set up the ADLY and PDLY resistors, first determine at
what drain to source voltage to turn-on the MOSFETs. Finite
372212fb
14
For more information www.linear.com/LTC3722
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| LTC3722IGN-2#PBF | 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3722IGN-2#TRPBF | 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3723EGN-1 | 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3723EGN-1#2EYPBF | 制造商:Linear Technology 功能描述: |
| LTC3723EGN-1#PBF | 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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