参数资料
型号: UCC28051P
厂商: Texas Instruments
文件页数: 16/32页
文件大小: 0K
描述: IC PFC CTRLR TRANSITION 8DIP
标准包装: 50
模式: 间歇(跃迁)
频率 - 开关: 200kHz
电流 - 启动: 75µA
电源电压: 12 V ~ 18 V
工作温度: -40°C ~ 105°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
包装: 管件
产品目录页面: 1052 (CN2011-ZH PDF)
配用: 296-19036-ND - EVAL MODULE FOR UCC28051
其它名称: 296-15224-5
UCC28050, UCC28051
UCC38050, UCC38051
SLUS515F?SEPTEMBER 2002 ? REVISED MARCH 2009
Bias Current
The bias voltage is supplied by a bias winding on the inductor. Select the turns ratio so that sufficient bias voltage
can be achieved at low ac line voltage. The bias capacitor must be large enough to maintain sufficient voltage
with ac line variations. Be sure to connect a 0.1- μ F bypass capacitor between the VCC pin and the GND pin
as close to the integrated circuit as possible. For wide line variations, a resistor, R B , is necessary in order to
permit clamping action. The bias voltage should also be clamped with an external zener diode to a maximum
of 18 V.
Zero Current Detection
The zero current detection activates when the ZCD voltage falls below 1.4 V. The bias winding can provide the
necessary voltage. This pin has a clamp at approximately 5 V. Add a current limiting resistor, R ZC , to keep the
maximum current below 1 mA.
16
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