L6599 STMicroelectronics, L6599 Datasheet - Page 17

• Manufacturer Part Number: L6599
• Description: High-voltage resonant controller
• Manufacturer: STMicroelectronics

Specifications of L6599

• Dimensions (l/w/h): 132 mm / 52 mm / 22 mm
• Universal Ac Mains Range: 90 VAC to 264 VAC
• High Output Power: 90 W (4.74 A, 19 VDC)
• Very Low Output Noise And Ripple: less than 300 m VP-P
• Very Low Standby Power: less than 0.5 W at 264 V
• Hiccup Mode: Auto recovery with SCP
• Latch Mode: OVP acts while VOUT > 29 VDC

L6599
After fixing CF in the hundred pF or in the nF (consistently with the maximum source
capability of the RF
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):
A different selection criterion will be given for RF
will be used (see "Operation at no load or very light load" section).
Figure 23. Oscillator waveforms and their relationship with gate-driving signals
In
signals, as well as the swinging node of the half-bridge leg (HB) is shown. Note that the low-
side gate-drive is turned on while the oscillator's triangle is ramping up and the high-side
gate-drive is turned on while the triangle is ramping down. In this way, at start-up, or as the
IC resumes switching during burst-mode operation, the low-side MOSFET will be switched
on first to charge the bootstrap capacitor. As a result, the bootstrap capacitor will always be
charged and ready to supply the high-side floating driver.
Figure 23
HVG
LVG
the timing relationship between the oscillator waveform and the gate-drive
HB
CF
min
and RF
min
pin and trading this off against the total consumption of the device),
max
T
will be selected so that the oscillator frequency is able to
D
RF
RF
min
T
D
max
=
=
------------------------------
3 CF f
⋅
-------------------- -
f
---------- - 1
f
RF
max
min
max
1
min
⋅
–
in case burst-mode operation at no-load
max
min
(at maximum input voltage and
Application information
min
(at minimum input
t
t
t
t
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