IC OFFLINE SWIT UVLO HV TO220

TOP242YN

Manufacturer Part NumberTOP242YN
DescriptionIC OFFLINE SWIT UVLO HV TO220
ManufacturerPower Integrations
SeriesTOPSwitch®-GX
TypeOff Line Switcher
TOP242YN datasheet
 


Specifications of TOP242YN

Output IsolationIsolatedFrequency Range66 ~ 132kHz
Voltage - Output700VPower (watts)22W
Operating Temperature-40°C ~ 150°CPackage / CaseTO-220-7 (Formed Leads), 5 Leads
Output Voltage12 VInput / Supply Voltage (max)265 VAC
Input / Supply Voltage (min)85 VACDuty Cycle (max)83 %
Switching Frequency132 KHzSupply Current1.6 mA
Operating Temperature Range- 40 C to + 150 CMounting StyleThrough Hole
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names596-1067-5
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TOP242-250
A High Efficiency, 250 W, 250-380 VDC Input Power Supply
The circuit shown in Figure 43 delivers 250 W (48 V @
5.2 A) at 84% efficiency using a TOP249 from a 250 VDC to
380 VDC input. DC input is shown, as typically at this power
level a p.f.c. boost stage would preceed this supply, providing the
DC input (C1 is included to provide local decoupling). Flyback
topology is still usable at this power level due to the high output
voltage, keeping the secondary peak currents low enough so
that the output diode and capacitors are reasonably sized.
In this example, the TOP249 is at the upper limit of its power
capability and the current limit is set to the internal maximum
by connecting the X pin to SOURCE. However, line sensing
is implemented by connecting a 2 MΩ resistor from the L pin
to the DC rail. If the DC input rail rises above 450 VDC, then
TOPSwitch-GX will stop switching until the voltage returns to
normal, preventing device damage.
Due to the high primary current, a low leakage inductance
transformer is essential. Therefore, a sandwich winding with
a copper foil secondary was used. Even with this technique,
the leakage inductance energy is beyond the power capability
of a simple Zener clamp. Therefore, R2, R3 and C6 are added
in parallel to VR1. These have been sized such that during
normal operation, very little power is dissipated by VR1,
the leakage energy instead being dissipated by R2 and R3.
R2
+250-380
VR1
68 kΩ
P6KE200
VDC
2 W
R1
2 MΩ
1/2 W
C1
22 µF
400 V
PERFORMANCE SUMMARY
Output Power:
250 W
± 1%
Line Regulation:
± 5%
Load Regulation:
≥ 85%
Efficiency:
< 100 mV pk-pk
Ripple:
No Load Consumption:
≤ 1.4 W (300 VDC)
0 V
Figure 43. 250 W, 48 V Power Supply using TOP249.
22
O
11/05
However, VR1 is essential to limit the peak drain voltage
during start-up and/or overload conditions to below the 700 V
rating of the TOPSwitch-GX MOSFET.
The secondary is rectifed and smoothed by D2 and C9, C10 and
C11. Three capacitors are used to meet the secondary ripple
current requirement. Inductor L2 and C12 provide switching
noise filtering.
A simple Zener sensing chain regulates the output voltage.
The sum of the voltage drop of VR2, VR3 and VR4 plus the
LED drop of U2 gives the desired output voltage. Resistor R6
limits LED current and sets overall control loop DC gain.
Diode D4 and C14 provide secondary soft-finish, feeding
current into the CONTROL pin prior to output regulation and
thus ensuring that the output voltage reaches regulation at start-
up under low line, full load conditions. Resistor R9 provides a
discharge path for C14. Capacitor C13 and R8 provide control
loop compensation and are required due to the gain associated
with such a high output voltage.
Sufficient heat sinking is required to keep the TOPSwitch-GX
device below 110 °C when operating under full load, low line
and maximum ambient temperature. Airflow may also be
required if a large heatsink area is not acceptable.
C7
2.2 nF Y1
D2
MUR1640CT
R3
C6
68 kΩ
4.7 nF
2 W
1 kV
C9
560 µF
63 V
D1
BYV26C
D2
1N4148
T1
TOPSwitch-GX
D
L
TOP249Y
U1
CONTROL
CONTROL
C
R4
S
X
F
6.8 Ω
C3
0.1 µF
C3
47 µF
50 V
10 V
C10
C11
L2
560 µF
560 µF
3 µH 8A
63 V
63 V
C12
68 µF
63 V
U2
LTV817A
R9
10 kΩ
C4
1 µF
50 V
R6
100 Ω
C13
150 nF
D4
63 V
1N4148
VR2 22 V
BZX79B22
C14
VR3 12 V
22 µF
R8
BZX79B12
63 V
56 Ω
VR4 12 V
BZX79B12
All resistor 1/8 W 5% unless
otherwise stated.
PI-2692-081204
48 V@
5.2 A
RTN