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参数资料
| 型号： | L6668 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING CONTROLLER, 105 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, SOP-16 |
| 文件页数： | 5/23页 |
| 文件大小： | 720K |
| 代理商： | L6668 |
13/23
L6668
With reference to the timing diagram of figure 36, when power is first applied to the converter the voltage
on the bulk capacitor (Vin) builds up and, as it reaches about 80V, the HV generator is enabled to oper-
ate (HV_EN is pulled high) so that it draws about 1 mA. This current, diminished by the IC consumption,
charges the bypass capacitor connected between pin Vcc (5) and ground and makes its voltage rise al-
most linearly.
Figure 36. Timing diagram: normal power-up and power-down sequences
As the Vcc voltage reaches the start-up threshold (13.5V typ.) the low-voltage chip starts operating and
the HV generator is cut off by the Vcc_OK signal asserted high. The IC is powered by the energy stored
in the Vcc capacitor until the self-supply circuit (typically an auxiliary winding of the transformer and a
steering diode) develops a voltage high enough to sustain the operation.
The residual consumption of this circuit is just the one on the 15M
resistor (≈10 mW at 400 Vdc), typically
50-70 times lower, under the same conditions, as compared to a standard start-up circuit made with an
external dropping resistor.
Figure 37. Timing diagram showing short-circuit behavior
Vcc
OUT
HV_EN
Vcc ON
Vcc OFF
Vcc restart
t
Vin
V
HVstart
IHV
1 mA
t
Vcc_OK
Power-up
Power-down
Normal
operation
regulation is lost here
Vcc
OUT
HV_EN
Vcc ON
Vcc OFF
Vcc restart
t
Vin
V
HVstart
IHV
1 mA
t
Vcc_OK
Power-up
Power-down
Normal
operation
regulation is lost here
Vcc
OUT
Vcc_OK
VccON
VccOFF
Vccrest
IHV
1 mA
Short circuit occurs here
t
Vcc
OUT
Vcc_OK
VccON
VccOFF
Vccrest
IHV
1 mA
Short circuit occurs here
t
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6668_06 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SMART PRIMARY CONTROLLER |
| L6668B2 | 功能描述:电流型 PWM 控制器 POWER SUPPLY RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6668TR | 功能描述:电流型 PWM 控制器 SMART CONTROLLER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L667 | 制造商:BURNDY 功能描述:L-DIE |
| L-667 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:Common Mode Inductor For DC/DC Power supply |
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