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参数资料
| 型号： | LTC3722IGN-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/28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
R START(MAX) = V IN(MIN) ?
C HOLDUP = (I CC + I DRIVE ) ?
FixedDelayMode
The LTC3722-1/LTC3722-2 provides the flexibility through
the SBUS pin to disable the DirectSense delay circuitry
and enable fixed ZVS delays. The level of fixed ZVS delay
is proportional to the voltage programmed through the
voltage divider on the PDLY and ADLY pins (see Figure 3
for more detail).
V REF
SBUS R1
PDLY
R2
ADLY
R3
372212 F03
Figure 3. Setup for Fixed ZVS Delays
Programming Adaptive Delay Time-Out
The LTC3722-1/LTC3722-2 controllers include a feature to
program the maximum time delay before a bridge switch
turn on command is summoned. This function will come
into play if there is not enough energy to commutate a
bridge leg to the opposite supply rail, therefore bypass-
ing the adaptive delay circuitry. The time delay can be
set with an external resistor connected between DPRG
and V REF (see Figure 4). The nominal regulated voltage
on DPRG is 2V. The external resistor programs a current
which flows into DPRG. The delay can be adjusted from
approximately 35ns to 300ns, depending on the resistor
value. If DPRG is left open, the delay time is approximately
400ns. The amount of delay can also be modulated based
on an external current source that feeds current into DPRG.
Care must be taken to limit the current fed into DPRG to
350μA or less.
V REF
Powering the LTC3722-1/LTC3722-2
The LTC3722-1/LTC3722-2 utilize an integrated V CC shunt
regulator to serve the dual purposes of limiting the volt-
age applied to V CC as well as signaling that the chip’s bias
voltage is sufficient to begin switching operation (under-
voltage lockout). With its typical 10.2V turn-on voltage
and 4.2V UVLO hysteresis, the LTC3722-1/LTC3722-2
is tolerant of loosely regulated input sources such as an
auxiliary transformer winding. The V CC shunt is capable
of sinking up to 25mA of externally applied current. The
UVLO turn-on and turn-off thresholds are derived from
an internally trimmed reference making them extremely
accurate. In addition, the LTC3722-1/LTC3722-2 exhibits
very low (145μA typ) start-up current that allows the use
of 1/8W to 1/4W trickle charge start-up resistors.
The trickle charge resistor should be selected as follows:
10.7V
250μA
Adding a small safety margin and choosing standard
values yields:
APPLICATION V IN RANGE R START
DC/DC 36V TO 72V 100k
Off-Line 85V to 270V RMS 430k
PFC Preregulator 390V DC 1.4M
V CC should be bypassed with a 0.1μF to 1μF multilayer
ceramic capacitor to decouple the fast transient currents
demanded by the output drivers and a bulk tantalum or
electrolytic capacitor to hold up the V CC supply before
the bootstrap winding, or an auxiliary regulator circuit
takes over.
t DELAY
3.8V
(minimum UVLO hysteresis)
R DPRG
DPRG
+
V 2V
–
SBUS
+
–
TURN-ON
OUTPUT
372212 F04
Figure 4. Delay Timeout Circuitry
372212fb
For more information www.linear.com/LTC3722
15
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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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