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
Application Examples
A High Efficiency, 30 W, Universal Input Power Supply
The circuit shown in Figure 41 takes advantage of several of
the TOPSwitch-GX features to reduce system cost and power
supply size and to improve efficiency. This design delivers
30 W at 12 V, from an 85 VAC to 265 VAC input, at an ambient
of 50 °C, in an open frame configuration. A nominal efficiency
of 80% at full load is achieved using TOP244Y.
The current limit is externally set by resistors R1 and R2 to a
value just above the low line operating peak DRAIN current
of approximately 70% of the default current limit. This
allows use of a smaller transformer core size and/or higher
transformer primary inductance for a given output power,
reducing TOPSwitch-GX power dissipation, while at the same
time avoiding transformer core saturation during startup and
output transient conditions. The resistors R1 & R2 provide a
signal that reduces the current limit with increasing line voltage,
which in turn limits the maximum overload power at high input
line voltage. This function in combination with the built-in
soft-start feature of TOPSwitch-GX, allows the use of a low cost
RCD clamp (R3, C3 and D1) with a higher reflected voltage,
by safely limiting the TOPSwitch-GX drain voltage, with
adequate margin under worst case conditions. Resistor R4
provides line sensing, setting UV at 100 VDC and OV at
450 VDC. The extended maximum duty cycle feature of
PERFORMANCE SUMMARY
Output Power:
30 W
± 4%
Regulation:
≥ 79%
Efficiency:
≤ 50 mV pk-pk
Ripple:
BR1
600 V
2A
L1
20 mH
C1
68 µF
CX1
400 V
100 nF
250 VAC
F1
J1
3.15 A
L
N
Figure 41. 30 W Power Supply using External Current Limit Programming and Line Sensing for UV and OV.
20
O
11/05
TOPSwitch-GX (guaranteed minimum value of 75% vs. 64%
for TOPSwitch-II) allows the use of a smaller input capacitor
(C1). The extended maximum duty cycle and the higher
reflected voltage possible with the RCD clamp also permit
the use of a higher primary to secondary turns ratio for T1,
which reduces the peak reverse voltage experienced by the
secondary rectifier D8. As a result a 60 V Schottky rectifier
can be used for up to 15 V outputs, which greatly improves
power supply efficiency. The frequency reduction feature of the
TOPSwitch-GX eliminates the need for any dummy loading
for regulation at no load and reduces the no-load/standby
consumption of the power supply. Frequency jitter provides
improved margin for conducted EMI, meeting the CISPR 22
(FCC B) specification.
Output regulation is achieved by using a simple Zener sense
circuit for low cost. The output voltage is determined by the
Zener diode (VR2) voltage and the voltage drops across the
optocoupler (U2) LED and resistor R6. Resistor R8 provides
bias current to Zener VR2 for typical regulation of ±5% at
the 12 V output level, over line and load and component
variations.
A High Efficiency, Enclosed, 70 W, Universal Adapter Supply
The circuit shown in Figure 42 takes advantage of several of the
TOPSwitch-GX features to reduce cost, power supply size and
CY1
2.2 nF
R15
C14
150 Ω
1 nF
R3
C3
68 kΩ
4.7 nF
D8
2 W
1 kV
MBR1060
D1
UF4005
R4
1N4148
2 MΩ
1/2 W
T1
R1
4.7 MΩ
1/2 W
TOPSwitch-GX
D
L
U1
TOP244Y
CONTROL
CONTROL
C
R5
S
X
F
6.8 Ω
R2
C5
9.09 kΩ
47 µF
10 V
L3
3.3 µH
C10
C11
220 µF
560 µF
560 µF
35 V
35 V
D2
R6
150 Ω
R8
150 Ω
C6
0.1 µF
U2
LTV817A
VR2
1N5240C
10 V, 2%
12 V @
2.5 A
C12
35 V
RTN
PI-2657-081204