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参数资料
| 型号： | SG5842JASZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO PWM 8-SOP |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 68kHz |
| 占空比： | 70% |
| 电源电压： | 10.5 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 ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Functional Description (Continued)
t D - OLP (ms) = 2 . 154 × R I (K Ω )
Limited Power Control
The FB voltage increases every time the output of the
power supply is shorted or overloaded. If the FB voltage
remains higher than a built-in threshold longer than t D-
OLP , PWM output is turned off. As PWM output is turned
off, the supply voltage V DD begins decreasing.
(2)
When V DD goes below the turn-off threshold (eg.
10.5V), the controller is totally shut down. V DD is
charged up to the turn-on threshold voltage of 16.5V
through the startup resistor until PWM output is
restarted. This protection feature remains activated as
long as the overloading condition persists. This
prevents the power supply from overheating due to
overloading conditions.
Protection Latch Circuit
The built-in latch function provides a versatile protection
feature that does not require external components (see
ordering information for a detailed description) . To reset
the latch circuit, disconnect the AC line voltage of the
power supply.
? 2007 Fairchild Semiconductor Corporation
SG5842A/SG582JA ? Rev. 1.4.3
11
Thermal Protection
An external NTC thermistor can be connected from the
RT pin to ground. A fixed current, I RT , is sourced from
the RT pin. Because the impedance of the NTC
decreases at high temperatures, when the voltage of
the RT pin drops below 1.05V, PWM output is latched
off. The RT pin output current is related to the PWM
frequency programming resistor R I .
Noise Immunity
Noise from the current sense or the control signal may
cause significant pulse width jitter, particularly in
continuous-conduction mode. Slope compensation
helps alleviate this problem. Good placement and
layout practices should be followed. Avoid long PCB
traces and component leads. Compensation and filter
components should be located near the SG5842A/JA.
Increasing the power-MOS gate resistance is advised.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG5842JDSY | 功能描述:电流型 PWM 控制器 HI-INTEGRD GRN-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 |
| SG5842JDSZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG5843SZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG5851 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Low-Cost Green-Mode PWM Controller for Flyback Converters |
| SG5851A | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Low-Cost, Green-Mode, PWM Controller for Flyback Converters |
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