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
• Line overvoltage (OV) shutdown extends line surge limit
• Line feed forward with maximum duty cycle (DC
MAX
)
reduction rejects ripple and limits DC
MAX
at high line
• Single resistor sets OV/UV thresholds, DC
MAX
reduction
• 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
AC
IN
®
®
+
DC
OUT
-
D
M
CONTROL
TOPSwitch-FX
S
F
C
PI-2503-073099
Figure 1. Typical Flyback Application.
OUTPUT POWER TABLE
230 VAC
±
15%
PART
ORDER
Open
1
NUMBER
3
Adapter
Frame
2
85-265 VAC
Adapter
1
Open
Frame
2
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
TOP232P
TOP232G
TOP232Y
TOP233P
TOP233G
TOP233Y
TOP234P
TOP234G
TOP234Y
9W
10 W
13 W
20 W
16 W
30 W
15 W
25 W
25 W
50 W
30 W
75 W
6.5 W
7W
9W
15 W
11 W
20 W
10 W
15 W
15 W
30 W
20 W
45 W
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/DC
MAX
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
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, cycle skipping, 132 kHz switching frequency,
frequency jittering, wider DC
MAX
, 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 DC
MAX
, when combined
with other features allow for a 10% to 15% higher power
capability on the
TOPSwitch-FX
devices compared to equivalent
TOPSwitch-II
devices for the same input/output conditions.
July 2001
PAM [ POWER ANALOG MICOELECTRONICS ]
