TOP258GN-TL Power Integrations, TOP258GN-TL Datasheet - Page 23

• Manufacturer Part Number: TOP258GN-TL
• Description: IC OFFLINE SWIT PROG OVP 8SMD
• Manufacturer: Power Integrations
• Series: TOPSwitch®-HXr
• Type: Off Line Switcherr

Specifications of TOP258GN-TL

• Output Isolation: Isolated
• Frequency Range: 119 ~ 145kHz
• Voltage - Output: 700V
• Power (watts): 77W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-SMD Gull Wing, 7 Leads
• Output Voltage: 700 V
• Input / Supply Voltage (max): 9 V
• Input / Supply Voltage (min): - 0.3 V
• Duty Cycle (max): 78 %
• Switching Frequency: 132 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Output Current: 6.88 A
• Output Power: 48 W
• For Use With: 596-1193 - KIT REF DESIGN TOP HX FOR TOP258
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 596-1190-2

Figure 43.
A High Effi ciency, 20 W continuous – 80 W Peak, Universal
Input Power Supply
The circuit shown in Figure 43 takes advantage of several of
TOPSwitch-HX features to reduce system cost and power
supply size and to improve power supply effi ciency while
delivering signifi cant peak power for a short duration. This
design delivers continuous 20 W and peak 80 W at 32 V from
an 90 VAC to 264 VAC input. A nominal effi ciency of 82% at full
load is achieved using TOP258MN. The M-package part has an
optimized current limit to enable design of power supplies
capable of delivering high power for a short duration.
Resistor R12 sets the current limit of the part. Resistors R11
and R14 provide line feed forward information that reduces the
current limit with increasing DC bus voltage, thereby maintaining
a constant overload power level with increasing line voltage.
Resistors R1 and R2 implement the line undervoltage and over-
voltage function and also provide feed forward compensation for
reducing line frequency ripple at the output. The overvoltage
feature inhibits TOPSwitch-HX switching during a line surge
extending the high voltage withstand to 700 V without device
damage.
The snubber circuit comprising of VR7, R17, R25, C5 and D2
limits the maximum drain voltage and dissipates energy stored in
the leakage inductance of transformer T1. This clamp
confi guration maximizes energy effi ciency by preventing C5 from
discharging below the value of VR7 during the lower frequency
operating modes of TOPSwitch-HX. Resistor R25 damps high
frequency ringing for reduced EMI.
A combined output overvoltage and over power protection
circuit is provided via the latching shutdown feature of
www.powerint.com
5.3 mH
L1
1 M
R23
275 VAC
90 - 264
220 nF
VAC
1N4007
C1
1N4007
D8
D11
1 M
R24
20 W Continuous, 80 W Peak, Universal Input Power Supply using TOP258MN.
3.15 A
F1
1N4007
1N4007
D9
D10
100 nF
1N4007
400 V
2 M
2 M
C30
D13
R3
R4
t
RT1
10
o
68 k
0.125 W
R26
1 k
R15
1 M
R21
120 F
400 V
C3
2N3904
2 M
2 M
Q3
R2
R1
2N3904
39 k
Q1
R18
3.6 M
3.6 M
R11
R14
2N3904
7.5 k
R12
1%
Q2
BZY97C150
D
S
150 V
TOPSwitch-HX
VR7
CONTROL
TOP258MN
0.5 W
1 k
R17
U4
V
X
C
100 nF
FR107
50 V
C6
D2
100
10 nF
1N5250B
1 kV
R25
C5
20 V
VR5
TOPSwitch-HX and R20, C9, R22 and VR5. Should the bias
winding output voltage across C13 rise due to output overload
or an open loop fault (opto coupler failure), then VR5 conducts
triggering the latching shutdown. To prevent false triggering
due to short duration overload, a delay is provided by R20, R22
and C9.
To reset the supply following a latching shutdown, the V pin
must fall below the reset threshold. To prevent the long reset
delay associated with the input capacitor discharging, a fast AC
reset circuit is used. The AC input is rectifi ed and fi ltered by
D13 and C30. While the AC supply is present, Q3 is on and Q1
is off, allowing normal device operation. However when AC is
removed, Q1 pulls down the V pin and resets the latch. The supply
will then return to normal operation when AC is again applied.
Transistor Q2 provides an additional lower UV threshold to the
level programmed via R1, R2 and the V pin. At low input AC
voltage, Q2 turns off, allowing the X pin to fl oat and thereby
disabling switching.
A simple feedback circuit automatically regulates the output
voltage. Zener VR3 sets the output voltage together with the
voltage drop across series resistor R8, which sets the DC gain
of the circuit. Resistors R10 and C28 provide a phase boost to
improve loop bandwidth.
Diodes D6 and D7 are low-loss Schottky rectifi ers, and
capacitor C20 is the output fi lter capacitor. Inductor L3 is a
common mode choke to limit radiated EMI when long output
cables are used and the output return is connected to safety
earth ground. Example applications where this occurs include
PC peripherals, such as inkjet printers.
1
2
3
250 VAC
2 M
1 nF
R22
NC
C8
EF25
R6
6.8
47 F
16 V
C7
T1
5
10
9
4
LL4148
10 F
D5
50 V
C13
100 V
1 F
C9
0.5 W
68
R19
100 pF
130 k
STPS3150
1 kV
C26
R20
250 VAC
D6-D7
C10
1 nF
330 nF
C28
50 V
56
R10
PC817D
U2A
330 F
C20
50 V
TOP252-262
PI-4833-092007
1.5 k
1N5255B
R8
3.3 H
28 V
L2
VR3
2 k
R9
22 F
C31
50 V
47 H
L3
220 nF
C29
50 V
625 mA, 2.5 A
Rev. F 01/09
32 V
23
RTN
PK