Design Idea DI-93
™
PeakSwitch General Purpose
32 W Continuous (81 W Peak) Supply
Application
Device
Power Output
Input Voltage
Output Voltage
Topology
Inkjet Printer
PKS606Y
32 W / 81 W pk
90-265 VAC
30 V
Flyback
PeakSwitch has three functions that interact with each other:
auto-restart, conditional latching shutdown and smart AC line
sense. Components D5, C7, R5 and R6 enable the smart AC
line sense and the under-voltage lockout (UVLO) functions.
When U1 does not skip any switching cycles for >30 ms, the
auto-restart function activates. If AC line voltage is absent or
insufficient for normal operation when auto-restart activates,
latching shutdown is disabled, and normal operation will
resume after theAC line voltage is restored. IfAC line voltage
is sufficient for normal operation when auto-restart activates,
latching shutdown is enabled, andAC power must be removed
and reapplied to reset the latch. The low value of C7 enables
latch reset to occur quickly, once AC is removed.
Design Highlights
•
•
•
•
•
Delivers up to 2.5 times the full load power for 50 ms
Uses a small EE25 core transformer
Meets EPS active-mode efficiency specifications
No-load input power <200 mW at 265 VAC
High standby and sleep mode efficiency: >66% and 75%
Operation
Thissupplyisconfiguredasaflybackconverter. TheON/OFF
controller integrated within the PeakSwitch IC (U1) has an
internal oscillator frequency of 277 kHz. Feedback from the
outputcausesthecontrollertoskipMOSFETswitchingcycles
to regulate the output voltage. The skipping of switching
cycles adjusts the converters effective switching frequency
(FSW_EFF) to meet the demands of the load. When delivering
32 W continuously, the FSW_EFF is near 90 kHz. When the load
demands peak power from the supply, the controller skips
fewer switching cycles, raising the FSW_EFF. This enables the
supply to deliver peak power pulses of up to 81 W (for up to
50 ms), while keeping the output voltage in regulation.
The smart AC line sense components also enable the UVLO
function. UVLO inhibits MOSFET switching until current
into the EN/UV pin is >25 µA. Resistor R16 supplies the
1 µA threshold current that activates the UVLO and AC sense
features, keeping those functions activated during brownouts
and line sags.
R8
68 Ω
1/2 W
C10
1 nF
250 VAC
C11
330 pF
30 V @
1.07 A Cont.
2.7 A Peak
R9
0.33 Ω
2 W
C13
47 µF
16 V
C14
220 nF
50 V
D9
1N4148
L2
5.3 µH
C17
4.7 nF
1 kV
C5
2.2 nF 1N4764A
1 kV 100 V
VR1
9,10
D8
STPS3150
Q1
2N3906
C12
330 µF
50 V
R10
1
VR2
1.5 kΩ
C4
150 µF
400 V
R11
3 kΩ
D1-D4
1N4007
1N5255B
28 V
7,8
4
R3
10 kΩ
1/2 W
RTN
R15
2.2 Ω
3
2
D10
R4
22 Ω
1/2 W
VR3
1N5258B
36 V
UF4003
C15
100 nF
50 V
R12
1 kΩ
C6
47 µF
35 V
L1
5.3 mH
R7
4.7 kΩ
D6
FR106
Q2
5
R2
R1
FS202DA
1.3 MΩ 1.3 MΩ
D7
1N4148
T1
R5
2.2 MΩ
R6
2.4 MΩ
EE25
D5
1N4007
C3
680 nF
X1
R16
2.7 MΩ
O
t
C16
100 nF
RT1
10 Ω
PeakSwitch
U1
PKS606Y
D
EN/UV
BP
R14
100 Ω
C7
100 nF
400 V
U2
PC817X4
C1-C2
100 pF
250 VAC
R13
1 kΩ
C8
220 nF
50 V
F1
3.15 A
S
GND
J1
L
J3
C19
1 nF, 250 VAC
RTN Connected to PE via Flying Lead
PCB Term 18 AWG
PE
N
PI-4170-060706
Figure 1. 32 W (Continuous), 81 W (Peak) Power Supply Using PKS606Y.
June 2006
DI-93
www.powerint.com
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