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参数资料
| 型号： | FAN6862TY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR GREEN MODE 6-SSOT |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 62kHz ~ 68kHz |
| 输入电压： | 9.5 V ~ 24 V |
| 功率（瓦特）： | 300mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 标准包装 |
| 其它名称： | FAN6862TYDKR |
Operation Description
Startup Operation
Figure 22 shows a typical startup circuit and transformer
auxiliary winding for a FAN6862 application. Before
FAN6862 begins switching operation, it consumes only
startup current (typically 8 μ A) and the current supplied
through the startup resistor charges the V DD capacitor
(C DD ). When V DD reaches turn-on voltage of 16V (V DD-
ON ), FAN6862 begins switching and the current
consumed increases to 3mA. Then, the power required
is supplied from the transformer auxiliary winding. The
large hysteresis of V DD (8.5V) provides more holdup
time, which allows using a small capacitor for V DD . The
startup resistor is typically connected to AC line for a
fast reset of latch protection.
V DL
+
Np
Figure 23. PWM Frequency
C DL
-
Vo
AC line
R START
C DD
N A
V FB
FAN6862
V FB.ZDC
(1.7V)
1
GND
GATE
6
2
3
FB
RT
VDD
SENSE
5
4
I ds
Figure 22. Startup Circuit
Switching
Disabled
Switching
Disabled
Figure 24. Burst Mode Operation
Green-Mode Operation
The FAN6862 uses feedback voltage (V FB ) as an
indicator of the output load and modulates the PWM
frequency, as shown in Figure 23, such that the
switching frequency decreases as load decreases. In
heavy load conditions, the switching frequency is
65KHz. Once V FB decreases below V FB-N (2.2V), the
PWM frequency starts to linearly decrease from 65KHz
to 22.5kHz to reduce the switching losses. As V FB
decreases below V FB-G (2.1V), the switching frequency
is fixed at 22.5kHz and FAN6862 enters “deep” green
mode, where the operating current decreases to 2.5mA
(maximum), further reducing the standby power
consumption. As V FB decreases below V FB-ZDC (1.7V),
FAN6862 enters burst-mode operation. When V FB drops
below V FB-ZDC , FAN6862 stops switching and the output
voltage starts to drop, which causes the feedback
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test
equipment. An internal frequency hopping circuit
changes the switching frequency between 60.8kHz and
69.2kHz with a period of 4.4ms, as shown in Figure 25.
f s
69.2kHz
65.0kHz
60.8kHz
voltage to rise. Once V FB rises above V FB-ZDC , switching
resumes. Burst mode alternately enables and disables
4.4ms
t
switching, thereby reducing switching loss in standby
mode, as shown in Figure 24.
? 2009 Fairchild Semiconductor Corporation
FAN6862 ? Rev. 1.0.3
10
Figure 25. Frequency Hopping
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN6862WLTY | 功能描述:电流型 PWM 控制器 Green Mode PWM 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 |
| FAN6862WRTY | 功能描述:电流型 PWM 控制器 Green Mode PWM 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 |
| FAN6862WTY | 功能描述:电流型 PWM 控制器 Low Power Two-Input Logic Gate TinyLogic 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 |
| FAN6863 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| FAN6863FTY | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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