Download L6699: Enhanced high-voltage resonant controller

L6699: Enhanced high-voltage
resonant controller
Double-ended controller
specific to series-resonant
half-bridge topology
IC description
Symmetrical duty cycle,
variable frequency control of
ZVS resonant half bridge (HB)
Available in SO16N halogen
free package
Css
1
16
VBOOT
DELAY
2
15
HVG
CF
3
14
OUT
RFmin
4
13
N.C.
STBY
5
12
Vcc
ISEN
6
11
LVG
LINE
7
10
GND
DIS
8
9
PFC_STOP
2
Features and benefits
Features
Benefits
•
600 V high side gate driver with integrated bootstrap
diode and high dV/dt immunity
•
Improved reliability and reduced BOM
•
Non linear soft-start for monotonic output voltage rise
•
Prevents any dangerous hard switching at start-up
•
Self-adjusting adaptive dead-time
•
Maximized efficiency at both light and full load
•
Superior stand-by performance:
1. Improved burst-mode operating at light-load and noload
2. Direct interface with PFC controller
1.
2.
No audible noise
Reduced BOM
1.
Avoid potential MOSFET cross conduction; avoid hard
switching; improve reliability; reduce EMI
Improved design flexibility
Improved design flexibility
Easier system design
•
High performance protections:
1. Anti-capacitive mode protection
2. Two-level OCP: frequency-shift and immediate
shutdown
3. Latched disable input
4. Input for brownout protection or power ON/OFF
sequencing
2.
3.
4.
3
Why move to L6699
It improves efficiency thanks to:
•
A reduced internal consumption: 1 mA of quiescent current
•
Its internal auto adjusted dead-time which allows the user to optimize the design
of the resonant tank so that soft-switching can be achieved with a lower level of
reactive energy (i.e. magnetizing current), hence optimizing efficiency under a
broader load range, from full to light load
It improves system reliability and lifetime thanks to:
•
The internal anti-capacitive protection, which prevents the converter from working
in or too close to the capacitive mode, in order to guarantee soft-switching
•
The proprietary smooth start-up circuit that controls the half-bridge to prevent
hard-switching from occurring in the initial cycles
It avoids audible noise when entering burst-mode operation:
•
The first driver pulse length is shorter to prevent the initial peak current
Easy to design!
• Full set of both circuit calculation and simulation files (Orcad and Simplis)
44
STEVAL-ISA138V1: 90 W/19 V demo
final efficiency data: full load
92.5%
92.0%
91.5%
Efficiency
The board is mounting diodes on secondary side
91.0%
90.5%
90.0%
115 V-60 Hz
230 V-50 Hz
89.5%
Complete system: PFC + LLC stages
89.0%
88.5%
20%
30%
40%
50%
60%
Load
70%
80%
90%
100%
5
STEVAL-ISA138V1: 90 W/19 V demo
final efficiency data: light load
6
90.00%
85.00%
80.00%
75.00%
Efficiency
70.00%
65.00%
60.00%
Efficiency is higher
than 53% with Pout
of 250 mW
(ErP lot 6 compliant)
55.00%
50.00%
115 V - 60 Hz
230 V - 50 Hz
45.00%
Complete system: PFC + LLC stages
40.00%
35.00%
0
1
2
3
Output Power (W)
4
5
STEVAL-ISA143V1: 150 W/12 V demo
efficiency data: full load
94.00%
93.00%
92.00%
Efficiency
91.00%
90.00%
89.00%
115 V-60 Hz
230 V-50 Hz
88.00%
87.00%
86.00%
20%
Complete system: PFC + LLC + SRK2000
30%
40%
50%
60%
Load
70%
80%
90%
100%
7
STEVAL-ISA143V1: 150 W/12 V demo
light load efficiency data: light load
8
85.00%
80.00%
Efficiency
75.00%
70.00%
Efficiency is higher
than 51% with Pout
of 250 mW
(ErP lot 6 compliant)
65.00%
60.00%
115 V - 60 Hz
230 V - 50 Hz
55.00%
Complete system: PFC + LLC + SRK2000
50.00%
0
1
2
3
Output Power (W)
4
5
Thank you!
9