TOP234GN Power Integrations, TOP234GN Datasheet - Page 16

IC OFFLINE SWIT OVP UVLO 8SMD

TOP234GN

Manufacturer Part Number
TOP234GN
Description
IC OFFLINE SWIT OVP UVLO 8SMD
Manufacturer
Power Integrations
Series
TOPSwitch®-FXr
Type
Off Line Switcherr
Datasheet

Specifications of TOP234GN

Output Isolation
Isolated
Frequency Range
66 ~ 132kHz
Voltage - Output
700V
Power (watts)
30W
Operating Temperature
-40°C ~ 150°C
Package / Case
8-SMD Gull Wing, 7 Leads
Output Voltage
12 V
Input / Supply Voltage (max)
265 VAC
Input / Supply Voltage (min)
85 VAC
Duty Cycle (max)
78 %
Switching Frequency
132 KHz
Supply Current
1.5 mA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TOP234GN
Manufacturer:
PowerInt
Quantity:
350
Part Number:
TOP234GN
Manufacturer:
POWER
Quantity:
4 500
Company:
Part Number:
TOP234GN,,5800,SOP-7,POWER,,,2020+
0
Company:
Part Number:
TOP234GN-TL
Manufacturer:
POWER
Quantity:
10 000
Company:
Part Number:
TOP234GN-TL,,12000,SOP-7,PI,,,2020+
0
Company:
Part Number:
TOP234GN-TL,,2500,SOP-7,POWER,,,2020+
0
17 W PC Standby Power Supply
Figure 26 shows a 17 W PC standby application with 3.3 V and
5 V secondary outputs and a 15 V primary output. The supply
uses the TOP232 operating from 230 VAC or 100/115 VAC
with doubler input. This design takes advantage of the soft-
start, line under-voltage detect, tighter current limit variation
and higher switching frequency features of TOPSwitch-FX. For
example, the higher switching frequency with tighter current
limit variation allows use of an EE19 transformer core.
Furthermore, the spacing between high voltage DRAIN pin and
low voltage pins of the TOPSwitch-FX packages provides large
creepage distance which is a significant advantage in high
pollution environments such as fan cooled PC power supplies.
Capacitor C1 provides high frequency decoupling of the high
voltage DC supply, and is necessary only if there is a long trace
length from the source of the DC supply to the inputs of this
standby circuit. The line sense resistor R1 senses the DC input
voltage for line under-voltage. When AC is turned off, the
under-voltage detect feature of the TOPSwitch-FX prevents
auto-restart glitches at the output caused by the slow discharge
of large storage capacitance in the main converter. This is
Figure 26. 17 W PC Standby Supply.
16
200-375
TOP232-234
(optional)
0.01 µF
VDC
+
1 kV
-
C1
B
7/01
BZY97C-200
3.9 MΩ
TOP232Y
R1
VR1
UF4005
D1
U1
D
S
CONTROL
CONTROL
M
F
TOPSwitch-FX
47 µF
C5
CY1
1 nF
C
T1
6.8 Ω
R5
SB540
SB540
D3
D4
BAV21
D2
1000 µF
10 V
C10
35 V
C6
achieved by turning the power supply off when the input
voltage goes below a level needed to maintain output regulation
and keeping it off until the input voltage goes above the
under-voltage threshold (V
The under voltage threshold is set at 200VDC, slightly below
the required lowest operating DC input voltage, for start-up at
170VAC. This feature saves several components needed to
implement the glitch free turn off with discrete or
TOPSwitch-II based designs.
The bias winding is rectified and filtered by D2 and C6 to create
a bias voltage for the TOP232 and to provide a 15V primary
bias output voltage for the main power supply primary control
circuitry. Both 3.3V and 5V output voltages are sensed by R9,
R10 and R11 using a TL431 (U3) circuit shown. Resistor R6
limits current through optocoupler U2 and sets overall AC
control loop gain. Resistor R7 assures that there is sufficient
bias current for the TL431 when the optocoupler is at a minimum
current. Capacitor C8 provides a soft-finish function to eliminate
turn-on overshoot. The no load regulation (cycle-skipping) of
TOPSwitch-FX permits the circuit to meet the low standby
power requirement of the Blue Angel specification for PCs.
10 µF
35 V
C8
1000 µF
10 V
C12
301 Ω
R6
3.3 µH
3.3 µH
U3
TL431CLP
SFH615-2
L2
L1
510 Ω
U2
0.1 µF
R7
C7
100 µF
10 V
C11
100 µF
10 V
C13
UV
), when the AC is turned on again.
12.1 kΩ
16.2 kΩ
10 kΩ
R10
R11
R9
Referenced)
@ 30 mA
(Primary
PI-2537-040401
5 V
@ 2 A
3.3 V
@ 2 A
RTN
15 V

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