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| UC2875DW资料 | |
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UC2875DW PDF Download |
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File Size : 116 KB
Manufacturer:UNITRODE Description:DTC provides a means of limiting the output-switch duty cycle to a value less than 100 %, which is critical for boost and flyback converters. A current source generates a reference current (IDT) at DTC that is nominally equal to the current at the oscillator timing terminal, RT. Connecting a resistor between DTC and GND generates a dead-time reference voltage (VDT), which the PWM/DTC comparator compares to the oscillator triangle wave as described in the previous section. Nominally, the maximum duty cycle is 0 % when VDT is 0.7 V or less and 100 % when VDT is 1.3 V or greater. Because the triangle wave amplitude is a function of frequency and the source impedance of RT is relatively high (1250 Ω), choosing RDT for a specific maximum duty cycle, D, is accomplished using the following equation and the voltage limits for the frequency in question as found in Figure 11 (Voscmax and Voscmin are the maximum and minimum oscillator levels): |
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| 1PCS | 100PCS | 1K | 10K | ||
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型 号：UC2875DW 厂 家：UNITRODE 封 装：SMD 批 号：00+ 数 量：1513 说 明： |
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运 费：广东省内10元(平邮),广东省外20元(快递) 所在地：深圳市 新旧程度： |
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| 联系人：黄林锋 |
| 电 话：0755-82579969,83255343 |
| 手 机：13714599954, |
| QQ：172517499,137550090 |
| MSN：zfdz168@hotmail.com |
| 传 真：0755-82738881 |
| EMail：zfdz168@163.com |
| 公司地址： 深圳市福田区华强北路华强广场B座28楼L室 |
