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参数资料
| 型号： | MIC3809YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 3/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 8-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 2 V ~ 14 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC3809YMMTR MIC3809YMMTR-ND |
MIC3808/3809
Pin Description
Micrel
Pin Number
5
6
7
8
Pin Name
GND
OUTB
OUTA
VDD
Pin Function
Ground
Alternating high current output stages. Both stages are capable of driving the
gate of a power MOSFET. Each stage is capable of 500mA peak source
current, and 1A peak sink current. The output stages switch at half the
oscillator frequency, in a push/pull configuration. When the voltage on the
RC pin is rising, one of the two outputs is high, but during fall time, both
outputs are off. This “dead time” between the two outputs, along with a
slower output rise time than fall time, insures that the two outputs can not be
on at the same time. This dead time is typically 60ns to 200ns and depends
upon the values of the timing capacitor and resistor. The high-current output
drivers consist of MOSFET output devices, which switch from V DD to GND.
Each output stage also provides a very low impedance to overshoot and
undershoot. This means that in many cases, external Schottky clamp diodes
are not required.
The power input connection for this device. Although quiescent V DD current
is very low, total supply current will be higher, depending on OUTA and
OUTB current, and the programmed oscillator frequency. Total V DD current
is the sum of quiescent V DD current and the average OUT current. Knowing
the operating frequency and the MOSFET gate charge (Qg), average OUT
current can be calculated from I OUT = Qg × F, where F is frequency. To
prevent noise problems, bypass V DD to GND with a ceramic capacitor as
close to the chip as possible. A 1 μ F decoupling capacitor is recommended.
April 2005
3
MIC3808/3809
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