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PDF TOP233G Data sheet ( Hoja de datos )
| Número de pieza | TOP233G | |
| Descripción | (TOP232 - TOP234) Intergrated OFff-line Switcher | |
| Fabricantes | Power Integrations | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TOP233G (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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TOP232-234
TOPSwitch-®FX Family
Design Flexible, EcoSmart®, Integrated
Off-line Switcher
®
Product Highlights
Lower System Cost, High Design Flexibility
• Features eliminate or reduce cost of external components
• Fully integrated soft-start for minimum stress/overshoot
• Externally settable accurate current limit
• Wider duty cycle for more power, smaller input capacitor
• Line under-voltage (UV) detection: no turn off glitches
www•.DaLtainSeheoevte4rUv.oclotamge (OV) shutdown extends line surge limit
• Line feed forward with maximum duty cycle (DCMAX)
reduction rejects ripple and limits DCMAX at high line
• Single resistor sets OV/UV thresholds, DC reduction
MAX
• Frequency jittering reduces EMI and EMI filtering costs
• Regulates to zero load without dummy loading
• 132 kHz frequency reduces transformer/power supply size
• Half frequency option for video applications
• Hysteretic thermal shutdown for automatic recovery
• Large thermal hysteresis prevents PC board overheating
• Standard packages with omitted pins for large creepage
• Active-on and active-off remote ON/OFF capability
• Synchronizable to a lower frequency
EcoSmart® - Energy Efficient
• Cycle skipping reduces no-load consumption
• Reduced consumption in remote off mode
• Half frequency option for high efficiency standby
• Allows shutdown/wake-up via LAN/input port
Description
TOPSwitch-FX uses the proven TOPSwitch topology and cost
effectively integrates many new functions that reduce system
cost and, at the same time, improve design flexibility,
performance and energy efficiency. Like TOPSwitch, the high
voltage power MOSFET, PWM control, fault protection and
other control circuitry are all integrated onto a single CMOS
chip, but with two added terminals. The first one is a MULTI-
FUNCTION (M) pin, which implements programmable line
OV/UV shutdown and line feed forward/DCMAX reduction with
line voltage. The same pin can be used instead to externally set
an accurate current limit. In either case, this pin can also be used
for remote ON/OFF or to synchronize the oscillator to an
external, lower frequency signal. The second added terminal is
the FREQUENCY (F) pin and is available only in the Y
package. This pin provides the half frequency option when
connected to CONTROL (C) instead of SOURCE (S). The
features on the new pins can be disabled by shorting them to the
SOURCE, which allows the device to operate in a three terminal
+
AC DC
IN OUT
-
DM
TOPSwitch-FX
CONTROL
C
SF
Figure 1. Typical Flyback Application.
PI-2503-073099
OUTPUT POWER TABLE
PART
230 VAC ±15%
ORDER
NUMBER3 Adapter1
Open
Frame2
TOP232P
9W
TOP232G
15 W
TOP232Y 10 W
25 W
TOP233P
13 W
TOP233G
25 W
TOP233Y 20 W
50 W
TOP234P
16 W
TOP234G
30 W
TOP234Y 30 W
75 W
85-265 VAC
Adapter1
Open
Frame2
6.5 W 10 W
7 W 15 W
9 W 15 W
15 W
11 W
30 W
20 W
20 W
45 W
Table 1. Notes: 1. Typical continuous power in a non-ventilated
enclosed adapter measured at 50 ˚C ambient. 2. Maximum practical
continuous power in an open frame design with adequate heat sinking,
measured at 50 ˚C ambient. See key applications section for detailed
conditions. 3. Packages: P: DIP-8B, G: SMD-8B, Y: TO-220-7B.
TOPSwitch mode, but with the following new transparent
features:soft-start,cycleskipping,132 kHzswitchingfrequency,
frequency jittering, wider DCMAX, hysteretic thermal shutdown
and larger creepage. In addition, all critical parameters such as
frequency, current limit, PWM gain, etc. have tighter temperature
and absolute tolerances compared to the TOPSwitch-II family.
Higher current limit accuracy and larger DCMAX, when combined
with other features allow for a 10% to 15% higher power
capability on the TOPSwitch-FXdevices compared to equivalent
TOPSwitch-II devices for the same input/output conditions.
July 2001
1 page  
CONTROL pin current, before the CONTROL pin voltage has
had a chance to discharge to the lower threshold voltage of
approximately 4.8 V (internal supply under-voltage lockout
threshold). When the externally fed current charges the
CONTROL pin to the shunt regulator voltage of 5.8 V, current
in excess of the consumption of the chip is shunted to SOURCE
through resistor R as shown in Figure 2. This current flowing
E
through RE controls the duty cycle of the power MOSFET to
provide closed loop regulation. The shunt regulator has a finite
low output impedance Z that sets the gain of the error amplifier
C
when used in a primary feedback configuration. The dynamic
impedance ZC of the CONTROL pin together with the external
CONTROL pin capacitance sets the dominant pole for the
control loop.
wwwW.DahteanSahefaeut4ltUc.coonmdition such as an open loop or shorted output
prevents the flow of an external current into the CONTROL pin,
the capacitor on the CONTROL pin discharges towards 4.8 V.
At 4.8 V auto-restart is activated which turns the output MOSFET
off and puts the control circuitry in a low current standby mode.
The high-voltage current source turns on and charges the
external capacitance again. A hysteretic internal supply under-
voltage comparator keeps V within a window of typically 4.8
C
to 5.8 V by turning the high-voltage current source on and off
as shown in Figure 5. The auto-restart circuit has a divide-by-
8 counter which prevents the output MOSFET from turning on
again until eight discharge/charge cycles have elapsed. This is
accomplished by enabling the output MOSFET only when the
divide-by-8 counter reaches full count (S7). The counter
effectively limits TOPSwitch-FX power dissipation by reducing
the auto-restart duty cycle to typically 4%. Auto-restart mode
continues until output voltage regulation is again achieved
through closure of the feedback loop.
TOP232-234
Oscillator and Switching Frequency
The internal oscillator linearly charges and discharges an internal
capacitance between two voltage levels to create a sawtooth
waveform for the pulse width modulator. The oscillator sets the
pulse width modulator/current limit latch at the beginning of
each cycle.
The nominal switching frequency of 132 kHz was chosen to
minimize transformer size while keeping the fundamental EMI
frequency below 150 kHz. The FREQUENCY pin (available
only in TO-220 package), when shorted to the CONTROL pin,
lowers the switching frequency to 66 kHz (half frequency)
which may be preferable in some cases such as noise sensitive
video applications or a high efficiency standby mode. Otherwise,
the FREQUENCY pin should be connected to the SOURCE pin
for the default 132 kHz. Trimming of the current reference
improves oscillator frequency accuracy.
To further reduce the EMI level, the switching frequency is
jittered (frequency modulated) by approximately ±4 kHz at
250 Hz (typical) rate as shown in Figure 6. Figure 28 shows the
typical improvement of EMI measurements with frequency
jitter.
Pulse Width Modulator and Maximum Duty Cycle
The pulse width modulator implements voltage mode control
by driving the output MOSFET with a duty cycle inversely
proportional to the current into the CONTROL pin that is in
excess of the internal supply current of the chip (see Figure 4).
The excess current is the feedback error signal that appears
across RE (see Figure 2). This signal is filtered by an RC
network with a typical corner frequency of 7 kHz to reduce the
effect of switching noise in the chip supply current generated by
VLINE
0V
VUV
VC
0V
VDRAIN
0V
S7 S0
S1 S2
S6 S7 S0 S1 S2
S6 S7
S0
S1 S2
S6 S7 S7
5.8 V
4.8 V
VOUT
0V
12
3
Note: S0 through S7 are the output states of the auto-restart counter
2
4
Figure 5. Typical Waveforms for (1) Power Up (2) Normal Operation (3) Auto-restart (4) Power Down .
PI-2545-082299
5B
7/01
5 Page 
Typical Uses of FREQUENCY (F) Pin
TOP232-234
++
DC
Input
Voltage
D
CONTROL
C
SF
-
www.DataSheet4U.com
Figure 10. Full Frequency Operation (132 kHz).
PI-2505-081199
DC
Input
Voltage
-
D
CONTROL
C
SF
Figure 11. Half Frequency Operation (66 kHz).
PI-2506-081199
+
QS can be an optocoupler output.
DC
Input
Voltage
D
CONTROL
C
SF
STANDBY
QS47 kΩ
- RHF 20 kΩ 1 nF
PI-2507-040401
Figure 12. Half Frequency Standby Mode (For High Standby
Efficiency).
11B
7/01
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TOP233G.PDF ] | |
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