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参数资料
| 型号： | LT1737IS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 25/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO CM 16SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 125kHz |
| 占空比： | 90% |
| 电源电压： | 4.1 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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LT1737
TYPICAL APPLICATIO S
therefore requires a physically larger transformer. The larg-
est size VERSA-PAC is used, a VP5-0083. Three windings
are paralleled for both the primary and secondary.
Overall power supply efficiency and output regulation ver-
sus load current at the nominal V IN = 5V may be seen in
Figures 16 and 17.
90
80
70
60
50
40
30
20
NONISOLATED APPLICATION
While the LT1737 was designed to serve isolated flyback
applications, it is useful to note that it is also capable of
supporting nonisolated applications. These are performed
by providing a continuous pseudo-DC feedback signal to
the FB pin. (The part behaves as if the flyback waveform
is infinitely long.) Figure 18 demonstrates just such a
system.
A SEPIC topology is shown whereby a 8V to 16V input is
converted to a nonisolated 12V output. A conventional
resistive feedback divider, R3/R4 drives the FB pin. (Ca-
pacitor C7 serves to filter out high frequency ripple in the
output voltage.) A combination of an R/C network (R11/
C5) in parallel with a single capacitor (C9) on the V C node
provides the required loop compensation. The load com-
pensation function is unwanted, so the R OCMP pin is left
open and the R CMPC pin is grounded. An LT1121 low
dropout regulator is programmed to a nominal 8.25V
0.01
0.1
I LOAD (A)
1
10
1737 F16
output by the R12/R13 resistor divider, and this allows the
LT1737 to drive M1, a logic level MOSFET. Minimum on
5.25
5.00
Figure 16. Efficiency vs I LOAD
time programming resistor R5 is set to 33k to minimize the
required output preload. Minimum enable time has no
direct effect on steady state operation, but programming
resistor R7 has been set to 100k for rapid start-up. Enable
delay resistor is similarly set to 24k.
Overall power supply efficiency versus input voltage and
load current may be seen in Figure 19. Because this
application example utilizes a nonisolated topology, load
regulation is not an issue. It is typically 0.2% (25mV) from
no load to full load.
Other nonisolated switching topologies may be similarly
implemented. For example, Boost and NonIsolated Fly-
4.75
0
1
2
I LOAD (A)
3
4
1737 F17
back readily suggest themselves. (A Nonisolated Flyback
topology also can be used to generate a negative output
voltage. In this case, the feedback is a dynamic waveform
derived from the primary side of the transformer, similar
Figure 17. Load Regulation
to an isolated LT1737 application.)
1737fa
25
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| LT1738 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Slew Rate Controlled Ultralow Noise DC/DC Controller |
| LT1738EG | 功能描述:IC REG CTRLR PWM CM 20-SSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1738EG#PBF | 功能描述:IC REG CTRLR PWM CM 20-SSOP 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 |
| LT1738EG#TR | 功能描述:IC REG CTRLR PWM CM 20-SSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1738EG#TRPBF | 功能描述:IC REG CTRLR PWM CM 20-SSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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