®
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
AC
IN
DC
OUT
-
• 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
D
S
M
CONTROL
C
TOPSwitch-FX
• Line feed forward with maximum duty cycle (DCMAX
)
reduction rejects ripple and limits DCMAX at high line
F
• Single resistor sets OV/UV thresholds, DCMAX 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
PI-2503-073099
Figure 1. Typical Flyback Application.
OUTPUT POWER TABLE
• 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
230 VAC 15%
85-265 VAC
PART
ORDER
Open
Open
Adapter1
1
NUMBER3 Adapter
Frame2
Frame2
TOP232P
9 W
15 W
6.5 W
10 W
®
EcoSmart - Energy Efficient
TOP232G
• 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
10 W
13 W
20 W
16 W
30 W
25 W
25 W
50 W
30 W
75 W
7 W
9 W
15 W
15 W
30 W
20 W
45 W
TOP232Y
TOP233P
TOP233G
TOP233Y
TOP234P
TOP234G
TOP234Y
15 W
11 W
20 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/DCMAX reduction with
line voltage. The same pin can be used instead to externally set
anaccuratecurrentlimit. Ineithercase,thispincanalsobeused
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,whichallowsthedevicetooperateinathreeterminal
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,currentlimit,PWMgain,etc.havetightertemperature
and absolute tolerances compared to the TOPSwitch-II family.
HighercurrentlimitaccuracyandlargerDCMAX,whencombined
with other features allow for a 10% to 15% higher power
capabilityontheTOPSwitch-FXdevicescomparedtoequivalent
TOPSwitch-II devices for the same input/output conditions.
July 2001