L6599 STMicroelectronics, L6599 Datasheet - Page 22

• 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

Application information
22/36
Figure 29. Power vs frequency curve in an resonant half-bridge
As a result, the average input current will smoothly increase, without the peaking that occurs
with linear frequency sweep, and the output voltage will reach the regulated value with
almost no overshoot.
Typically, R
where f
quite empirical and is a compromise between an effective soft-start action and an effective
OCP (see next section). Please refer to the timing diagram of
significant signals during the soft-start phase.
start
SS
is recommended to be at least 4 times f
and C
SS
| Z ( f ) |
will be selected based on the following relationships:
- 1
R
C
SS
ss
=
=
RESONANCE
FREQUENCY
--------------------- -
f
----------- - 1
Steady-state
f
3 10
-------------------
start
RF
min
frequency
R
⋅
SS
min
–
–
min
3
. The proposed criterion for C
Figure 32
frequency
Initial
to see some
f
SS
L6599
is