参数资料
型号: L6599ADTR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: SWITCHING CONTROLLER, PDSO16
封装: ROHS COMPLIANT, SOP-16
文件页数: 11/36页
文件大小: 1595K
代理商: L6599ADTR
L6599A
Application information
Doc ID 15308 Rev 5
19/36
Figure 22.
Oscillator's internal block diagram
The following approximate relationships hold for the minimum and the maximum oscillator
frequency respectively:
Equation 1
After fixing CF in the hundred pF or in the nF (consistently with the maximum source
capability of the RFmin pin and trading this off against the total consumption of the device),
the value of RFmin and RFmax will be selected so that the oscillator frequency is able to
cover the entire range needed for regulation, from the minimum value fmin (at minimum input
voltage and maximum load) to the maximum value fmax (at maximum input voltage and
minimum load):
Equation 2
A different selection criterion will be given for RFmax in case burst-mode operation at no-load
()
max
min
max
min
RF
//
RF
CF
3
1
f
;
RF
CF
3
1
f
=
=
1
f
RF
;
f
CF
3
1
RF
min
max
min
max
min
=
=
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