lnk603 Power Integrations, Inc., lnk603 Datasheet - Page 7

• Manufacturer Part Number: lnk603
• Description: Energy-efficient, Accurate Cv/cc Switcher For Adapters And Chargers
• Manufacturer: Power Integrations, Inc.

Figure 8.
the BP pin voltage. The parameters I
the parameter table of the LinkSwitch-II datasheet. Diode D6
can be any low cost diode such as FR102, 1N4148 or
BAV19/20/21.
Quick Design Checklist
As with any power supply design, all LinkSwitch-II designs
should be verifi ed on the bench to make sure that component
specifi cations are not exceeded under worst-case conditions.
The following minimum set of tests is strongly recommended:
1.
2.
www.powerint.com
Maximum drain voltage – Verify that peak V
680 V at the highest input voltage and maximum output power.
Maximum drain current – At maximum ambient temperature,
maximum input voltage and maximum output load, verify
drain current waveforms at start-up for any signs of trans-
Figure 6.
LinkSwitch-II Flyback Power Supply Without Bias Supply.
Input
Desired Drain Voltage Waveform with Minimal Leakage
Ringing Undershoot.
AC
8.2
2 W
RF1
1N4007
1N4007
D1
D3
1N4007
1N4007
An overshoot
is acceptable
D2
D4
S2
and V
4.7 F
400 V
DS
1 mH
BP
C1
L1
does not exceed
are provided in
470 k
4.7 F
400 V
R2
C2
1N4007
300
D5
R3
3.
Design Tools
Up-to-date information on design tools can be found at the
Power Integrations web site: www.powerint.com
LinkSwitch-II
820 pF
LNK613DG
1 F
50 V
1 kV
former saturation and excessive leading edge current spikes.
LinkSwitch-II has a leading edge blanking time of 170 ns to
prevent premature termination of the ON-cycle.
Thermal check – At maximum output power, both minimum
and maximum input voltage and maximum ambient tempera-
ture; verify that temperature specifi cations are not exceeded
for LinkSwitch-II, transformer, output diodes and output
capacitors. Enough thermal margin should be allowed for
part-to-part variation of the R
specifi ed in the data sheet. To assure 10% CC tolerance a
maximum source pin temperature of 90 ºC is recommended.
C4
C3
Figure 7.
U1
5
3
EE13
Ring Undershoot.
TI
Undesirable Drain Voltage Waveform with Large Leakage
10
NC
8
2
4
SL13
D7
9.31 k
13 k
LNK603-606/613-616
1%
R5
1%
R6
470 F
10 V
C7
DS(ON)
PI-5116-050808
of LinkSwitch-II, as
1 k
Negative ring may
increase output
ripple and/or
degrade output
regulation
Output
DC
Rev. C 06/08
7