L6599A STMicroelectronics, L6599A Datasheet - Page 19

• Manufacturer Part Number: L6599A
• Description: IMPROVED HIGH-VOLTAGE RESONANT CONTROLLER
• Manufacturer: STMicroelectronics

Specifications of L6599A

• Two-level Ocp: frequency-shift and latched shutdown

L6599A
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 RF
cover the entire range needed for regulation, from the minimum value f
voltage and maximum load) to the maximum value f
minimum load):
Equation 2
A different selection criterion will be given for R
will be used (see
min
Section 7.2: Operation at no load or very light
and RF
f
min
=
3
RF
max
⋅
CF
min
Doc ID 15308 Rev 5
will be selected so that the oscillator frequency is able to
1
⋅
=
RF
3
min
⋅
CF
1
⋅
;
f
min
f
max
Fmax
;
=
RF
3
⋅
in case burst-mode operation at no-load
max
max
CF
⋅
(at maximum input voltage and
=
(
RF
f
f
max
RF
min
1
min
min
−
//
load).
1
RF
Application information
max
min
)
(at minimum input
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