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参数资料
| 型号： | LTC3803ES6-3 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件页数： | 15/16页 |
| 文件大小： | 165K |
| 代理商： | LTC3803ES6-3 |
8
LTC3803-3
38033fa
Start-Up/Shutdown
The LTC3803-3 has two shutdown mechanisms to disable
and enable operation: an undervoltage lockout on the VCC
supply pin voltage, and a forced shutdown whenever
external circuitry drives the ITH/RUN pin low. The
LTC3803-3 transitions into and out of shutdown accord-
ing to the state diagram (Figure 1).
LTC3803-3
SHUT DOWN
VITH/RUN < VITHSHDN
(NOMINALLY 0.28V)
38033 F01
VCC < VTURNOFF
(NOMINALLY 5.7V)
VITH/RUN > VITHSHDN
AND VCC > VTURNON
(NOMINALLY 8.7V)
LTC3803-3
ENABLED
Figure 1. Start-Up/Shutdown State Diagram
LTC3803-3 operation. The VCC voltage is then allowed to
fall to VTURNOFF (nominally 5.7V) before undervoltage
lockout disables the LTC3803-3. This wide UVLO hyster-
esis range supports the use of a bias winding on the
flyback transformer to power the LTC3803-3—see the
section Powering the LTC3803-3.
The ITH/RUN pin can be driven below VSHDN (nominally
0.28V) to force the LTC3803-3 into shutdown. An internal
0.3
μA current source always tries to pull this pin towards
VCC. When the ITH/RUN pin voltage is allowed to exceed
VSHDN, and VCC exceeds VTURNON, the LTC3803-3 begins
to operate and an internal clamp immediately pulls the
ITH/RUN pin up to about 0.7V. In operation, the ITH/RUN pin
voltage will vary from roughly 0.7V to 1.9V to represent cur-
rent comparator thresholds from zero to maximum.
Internal Soft-Start
An internal soft-start feature is enabled whenever the
LTC3803-3 comes out of shutdown. Specifically, the
ITH/RUN voltage is clamped and is prevented from reach-
ing maximum until roughly 1.4ms has passed. This
allows the input and output currents of LTC3803-3-
based power supplies to rise in a smooth and controlled
manner on start-up.
OPERATIO
U
The undervoltage lockout (UVLO) mechanism prevents
the LTC3803-3 from trying to drive a MOSFET with insuf-
ficient VGS. The voltage at the VCC pin must exceed
VTURNON (nominally 8.7V) at least momentarily to enable
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3803ES6-3#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Flyback 6-Pin TSOT-23 Bulk 制造商:Linear Technology 功能描述:DC/DC CONTRLER FLYBACK 300KH 制造商:Linear Technology 功能描述:DC/DC CONTRLER, FLYBACK, 300KHZ, 6SOT23 |
| LTC3803ES6-3#TRMPBF | 功能描述:IC REG CTRLR FLYBK PWM TSOT23-6 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) |
| LTC3803ES6-3#TRPBF | 功能描述:IC REG CTRLR FLYBK PWM TSOT23-6 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) |
| LTC3803ES6-5 | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Flyback 5V Input 6-Pin TSOT-23 |
| LTC3803ES6-5#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Flyback 5V Input 6-Pin TSOT-23 Bulk |
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