top233 Power Integrations, Inc., top233 Datasheet - Page 30

• Manufacturer Part Number: top233
• Description: Design Flexible, Ecosmart , Integrated Off-line Switcher
• Manufacturer: Power Integrations, Inc.

The following precautions should be followed when testing
TOPSwitch-FX by itself outside of a power supply. The schematic
shown in Figure 34 is suggested for laboratory testing of
TOPSwitch-FX.
When the DRAIN pin supply is turned on, the part will be in the
auto-restart mode. The CONTROL pin voltage will be oscillating
at a low frequency between 4.8 and 5.8 V and the drain is turned
on every eighth cycle of the CONTROL pin oscillation. If the
CONTROL pin power supply is turned on while in this auto-
Typical Performance Characteristics
30
TOP232-234
BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS
B
7/01
1.0
.9
.8
.7
.6
.5
.4
.3
-250
1.1
1.0
.9
.8
.7
.6
.5
.4
.3
Scaling Factors:
0
TOP234 1.50
TOP233 1.00
TOP232 0.50
Maximum and minimum levels
are based on characterization.
Minimum
CURRENT LIMIT vs. MULTI-FUNCTION
5K
-200
CURRENT LIMIT vs. EXTERNAL
External Current Limit Resistor R
CURRENT LIMIT RESISTANCE
Typical
10K
PIN CURRENT
-150
I
M
(µA)
Maximum
15K
restart mode, there is only a 12.5% chance that the CONTROL
pin oscillation will be in the correct state (drain active state) so
that the continuous drain voltage waveform may be observed.
It is recommended that the V
and the DRAIN pin power supply second if continuous drain
voltage waveforms are to be observed. The 12.5% chance of
being in the correct state is due to the divide-by-8 counter.
Temporarily shorting the CONTROL pin to the SOURCE pin
will reset TOPSwitch-FX, which then will come up in the
correct state.
-100
20K
IL
(Ω)
-50
Scaling Factors:
TOP234 1.50
TOP233 1.00
TOP232 0.50
25K
PI-2539-033001
PI-2540-033001
C
power supply be turned on first
30K
0
200
180
160
140
120
100
80
60
200
180
160
140
120
100
80
60