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参数资料
| 型号： | LTC3722IGN-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/28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
V BIAS < V UVLO
V IN
Regulated bias supplies as low as 7V can be utilized to
provide bias to the LTC3722-1/LTC3722-2. Figure 5 shows
various bias supply configurations.
12V ± 10%
to UVLO is present and greater than 5V prior to the V CC
UVLO circuitry activation, then the internal UVLO logic
will prevent output switching until the following three
conditions are met: (1) V CC UVLO is enabled, (2) V REF is
in regulation and (3) UVLO pin is greater than 5V.
1.5k
V CC
1N5226
3V
0.1μF
1N914
V CC
R START
0.1μF
+
C HOLD
372212 F05
UVLO can also be used to enable and disable the power
converter. An open drain transistor connected to UVLO,
as shown in Figure 6, provides this capability.
Figure 5. Bias Configurations
Programming Undervoltage Lockout
The LTC3722-1/LTC3722-2 provides undervoltage lockout
(UVLO) control for the input DC voltage feed to the power
converter in addition to the V CC UVLO function described
in the preceding section. Input DC feed UVLO is provided
with the UVLO pin. A comparator on UVLO compares a
divided down input DC feed voltage to the 5V precision
reference. When the 5V level is exceeded on UVLO, the
SS pin is released and output switching commences. At
the same time a 10μA current is enabled which flows out
of UVLO into the voltage divider connected to UVLO. The
amount of DC feed hysteresis provided by this current is:
10μA ? R TOP , see Figure 6. The system UVLO threshold is:
5V ? [(R TOP + R BOTTOM )/R BOTTOM ]. If the voltage applied
ON OFF
Off-Line Bias Supply Generation
If a regulated bias supply is not available to provide V CC
voltage to the LTC3722-1/LTC3722-2 and supporting
circuitry, one must be generated. Since the power require-
ment is small, approximately 1W, and the regulation is not
critical, a simple open-loop method is usually the easiest
and lowest cost approach. One method that works well
is to add a winding to the main power transformer, and
post regulate the resultant square wave with an L-C filter
(see Figure 7a). The advantage of this approach is that it
maintains decent regulation as the supply voltage varies,
and it does not require full safety isolation from the input
winding of the transformer. Some manufacturers include a
primary winding for this purpose in their standard product
offerings as well. A different approach is to add a winding
to the output inductor and peak detect and filter the square
wave signal (see Figure 7b). The polarity of this winding
R TOP
UVLO
R BOTTOM
372212 F06
Figure 6. System UVLO Setup
V IN
V CC
15V*
+
R START
C HOLD
2k
0.1μF
V IN
R START
ISO BARRIER
L OUT
+
V OUT
*OPTIONAL
372212 F07a
V CC
0.1μF
C HOLD
372212 F07b
Figure 7a. Auxiliary Winding Bias Supply
Figure 7b. Output Inductor Bias Supply
372212fb
16
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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