参数资料
型号: MC34703PNB
厂商: Freescale Semiconductor
文件页数: 32/46页
文件大小: 0K
描述: IC POWER SUPPLY QUICC 33-QFN
标准包装: 1
应用: 电源
电流 - 电源: 60mA
电源电压: 2.8 V ~ 13.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 33-PowerQFN
供应商设备封装: 33-PQFN(10x10)
包装: 管件
TYPICAL APPLICATIONS
C25
LCMP
C23
R7
LDRV
Vin
MOSFET
Rs
Co2 +
Vout
ISNS
LDO
R11
LFB
Vref
R10
Figure 31. Linear Regulator Circuit
Compensation Components Setting
The compensation component values have been
determined by the design. The recommended values are the
following:
C 25 = 10nF, C 23 =6.8nF, R 7 = 1.5K ?
Since the compensation component values designed are
dependent on the output capacitor value, the capacitance of
10 μ F for the output capacitor C o is recommended.
Figure 31 . The voltage drop caused by the regulator output
current flowing through the current sense resistor is sensed
between the LDO and the ISNS pins. When the sensed
voltage exceeds 45 mV (Design), the current limit timer starts
to time out while the control circuit limits the output current. If
the over current condition lasts for more than 10 ms, the
linear regulator is shut off and tuned on again after 100 ms.
This type of operation provides equivalent protection to the
analog “current fold-back” operation. Figure 32 shows a
sample of the LDO in the Over current protection.
Output Current Limit Setting
The current limit of the linear regulator can be adjusted by
means of an external current sense resistor R s , see
V RESET
V OUT
V LDO
I OUT
Figure 32. LDO in the Over Current Condition
34703
Analog Integrated Circuit Device Data
32
Freescale Semiconductor
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