IC OFFLINE SWIT OVP UVLO 8SMD

TOP234G

Manufacturer Part NumberTOP234G
DescriptionIC OFFLINE SWIT OVP UVLO 8SMD
ManufacturerPower Integrations
SeriesTOPSwitch®-FX
TypeOff Line Switcher
TOP234G datasheet
 

Specifications of TOP234G

Output IsolationIsolatedFrequency Range66 ~ 132kHz
Voltage - Output700VPower (watts)30W
Operating Temperature-40°C ~ 150°CPackage / Case8-SMD Gull Wing, 7 Leads
Output Voltage12 VInput / Supply Voltage (max)265 VAC
Input / Supply Voltage (min)85 VACDuty Cycle (max)78 %
Switching Frequency132 KHzSupply Current1.5 mA
Operating Temperature Range- 40 C to + 150 CMounting StyleSMD/SMT
Lead Free Status / RoHS StatusContains lead / RoHS non-compliant  
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TOP232-234
TOPSwitch-FX Family
Design Flexible, EcoSmart
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
reduction rejects ripple and limits DC
• Single resistor sets OV/UV thresholds, DC
• 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/DC
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
®
®
, Integrated
AC
IN
)
MAX
at high line
MAX
reduction
MAX
Figure 1. Typical Flyback Application.
PART
ORDER
NUMBER
TOP232P
TOP232G
TOP232Y
TOP233P
TOP233G
TOP233Y
TOP234P
TOP234G
TOP234Y
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.
reduction with
TOPSwitch mode, but with the following new transparent
MAX
features: soft-start, cycle skipping, 132 kHz switching frequency,
frequency jittering, wider DC
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
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.
D
M
CONTROL
C
TOPSwitch-FX
S
F
OUTPUT POWER TABLE
±
230 VAC
15%
Open
Adapter
Adapter
1
3
Frame
2
9 W
15 W
6.5 W
10 W
25 W
7 W
13 W
25 W
9 W
20 W
50 W
15 W
16 W
30 W
11 W
30 W
75 W
20 W
, hysteretic thermal shutdown
MAX
®
+
DC
OUT
-
PI-2503-073099
85-265 VAC
Open
1
2
Frame
10 W
15 W
15 W
30 W
20 W
45 W
, when combined
MAX
July 2001

TOP234G Summary of contents

  • Page 1

    ... TOP232Y TOP233P TOP233G TOP233Y TOP234P TOP234G TOP234Y 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 ...

  • Page 2

    TOP232-234 Pin Functional Description ......................................................................................................................................... 3 TOPSwitch-FX Family Functional Description ......................................................................................................... 4 CONTROL (C) Pin Operation ................................................................................................................................. 4 Oscillator and Switching Frequency ....................................................................................................................... 5 Pulse Width Modulator and Maximum Duty Cycle ................................................................................................. 5 Minimum Duty Cycle and Cycle Skipping ............................................................................................................... ...

  • Page 3

    CONTROL ( SHUNT REGULATOR/ ERROR AMPLIFIER - + 5 (LIMIT) CURRENT LIMIT ADJUST ON/OFF MULTI- FUNCTION ( OV/UV LINE SENSE DC MAX FREQUENCY (F) ...

  • Page 4

    TOP232-234 TOPSwitch-FX Family Functional Description Like TOPSwitch, TOPSwitch- integrated switched mode power supply chip that converts a current at the control input to a duty cycle at the open drain output of a high voltage power MOSFET. During ...

  • Page 5

    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 ...

  • Page 6

    TOP232-234 the MOSFET gate driver. The filtered error signal is compared with the internal oscillator sawtooth waveform to generate the duty cycle waveform. As the control current increases, the duty cycle decreases. A clock signal from the oscillator sets a ...

  • Page 7

    At power down, UV prevents auto-restart attempts after the output goes out of regulation. This eliminates power down glitches caused by the slow discharge of input storage capacitor present in applications such as standby supplies. ...

  • Page 8

    TOP232-234 As seen above, the remote ON/OFF feature allows the TOPSwitch- turned on and off instantly cycle-by- cycle basis, with very little delay. However, remote ON/OFF can also be used as a standby or power switch ...

  • Page 9

    Using FREQUENCY and MULTI- FUNCTION Pins FREQUENCY (F) Pin Operation The FREQUENCY pin is a digital input pin available in TO-220 package only. Shorting the FREQUENCY pin to SOURCE pin selects the nominal switching frequency of 132 kHz (Figure 10) ...

  • Page 10

    TOP232-234 (Enabled) Output MOSFET Switching (Disabled) I (Default) LIMIT Current Limit DC (78.5%) MAX Maximum Duty Cycle MULTI FUNCTION Pin Voltage -250 -200 -150 Note: This figure provides idealized functional characteristics of the MULTI-FUNCTION pin with typical performance ...

  • Page 11

    Typical Uses of FREQUENCY (F) Pin + DC D Input CONTROL Voltage Figure 10. Full Frequency Operation (132 kHz). Figure 12. Half Frequency Standby Mode (For High Standby Input Voltage C PI-2505-081199 Figure 11. Half Frequency Operation ...

  • Page 12

    TOP232-234 Typical Uses of MULTI-FUNCTION (M) Pin + DC Input Voltage D M CONTROL S - Figure 13. Three Terminal Operation (MULTI-FUNCTION Features Disabled. FREQUENCY Pin Tied to SOURCE or CONTROL Pin MΩ kΩ Input Voltage ...

  • Page 13

    Typical Uses of MULTI-FUNCTION (M) Pin (cont output or can be replaced by a manual switch. DC Input Voltage D M CONTROL Q R ON/OFF 47 kΩ Figure 19. Active-on (Fail Safe) Remote ON/OFF. + ...

  • Page 14

    TOP232-234 Application Examples A High Efficiency Universal Input Power Supply The circuit shown in Figure 24 takes advantage of several of the TOPSwitch-FX features to reduce system cost and power supply size and to improve efficiency. This design ...

  • Page 15

    W Multiple Output Power Supply Figure 25 shows a five output secondary regulated power supply utilizing a TOP233 for multiple output applications such as set-top box, VCR, DVD, etc. The circuit shown is designed for a 230 ...

  • Page 16

    TOP232-234 Standby Power Supply Figure 26 shows standby application with 3.3 V and 5 V secondary outputs and primary output. The supply uses the TOP232 operating from 230 VAC or ...

  • Page 17

    Processor Controlled Supply Turn On/Off A low cost momentary contact switch can be used to turn the TOPSwitch-FX power on and off under microprocessor control that may be required in some applications such as printers. The low power remote off ...

  • Page 18

    TOP232-234 In addition to using a minimum number of components, TOPSwitch-FX provides many technical advantages in this type of application: 1. Extremely low power consumption in the off mode typical at 110 VAC and 160 mW typical at ...

  • Page 19

    Key Application Considerations TOPSwitch-FX vs. TOPSwitch-ll Table 3 compares the features and performance differences between TOPSwitch-FX and TOPSwitch-II. Many of the new features eliminate the need for costly discrete component. Function TOPSwitch-II Soft-Start N/A* External Current Limit N/A* DC 67% ...

  • Page 20

    TOP232-234 Function TOPSwitch-II Remote ON/OFF N/A* Synchronization N/A* Thermal Shutdown Latched Current Limit Tolerance ±10% (@25 °C) -8% (0 °C to100 °C) -4% (0 °C to 100 °C) DRAIN DIP 0.037" / 0.94 mm Creepage at SMD 0.037" / 0.94 ...

  • Page 21

    Zener clamp but requires more careful design (see quick design checklist). Output Diode The output diode is selected for peak inverse voltage, output current, and thermal conditions in the application (including heat sinking, air ...

  • Page 22

    TOP232-234 + J1 Input Filter Capacitor TOP VIEW M R1 Figure 29. Layout Considerations for TOPSwitch-FX using DIP or SMD (Using Line Sensing for Under-Voltage and Overvoltage Input Filter Capacitor Heat Sink ...

  • Page 23

    Zener clamp, 165 V when using an RCD clamp and 185 V when using RCD clamp with current limit feed forward. For designs where operating current is significantly lower than the default current limit recommended to ...

  • Page 24

    TOP232-234 DRAIN Voltage ............................................ -0.3 to 700 V DRAIN Peak Current: TOP232 ................................. 0.8 A TOP233 ................................. 1.6 A TOP234 ................................. 2.4 A CONTROL Voltage .......................................... -0 CONTROL Current ...............................................100 mA MULTI-FUNCTION Pin Voltage .................... -0.3 to ...

  • Page 25

    Parameter Symbol CONTROL FUNCTIONS (cont.) PWM Gain Temperature Drift External Bias l Current B CONTROL Current at Start of Cycle Skipping Dynamic Z Impedance C Dynamic Impedance Temperature Drift Control Pin Internal Filter Pole SHUTDOWN/AUTO-RESTART Control Pin l Charging Current ...

  • Page 26

    TOP232-234 Parameter Symbol MULTI-FUNCTION INPUT Line Under-Voltage l Threshold Current UV Line Over-Voltage or Remote ON/ I OFF Threshold OV Current and Hysteresis Remote ON/OFF Negative Threshold I REM (N) Current and Hysteresis MULTI-FUNCTION I Pin Short Circuit M (SC) ...

  • Page 27

    Parameter Symbol FREQUENCY INPUT FREQUENCY Pin V Threshold Voltage F FREQUENCY Pin I Input Current F CIRCUIT PROTECTION Self Protection I LIMIT Current Limit I Initial Current Limit INIT Leading Edge t Blanking Time LEB Current Limit Delay t ILD ...

  • Page 28

    TOP232-234 Parameter Symbol OUTPUT (cont.) Off-State I Current DSS Breakdown BV Voltage DSS Rise t Time R Fall t Time F SUPPLY VOLTAGE CHARACTERISTICS DRAIN Supply Voltage Shunt Regulator V Voltage C(SHUNT) Shunt Regulator Temperature Drift l CD1 Control Supply/ ...

  • Page 29

    VOLTAGE Figure 31. Duty Cycle Measurement. 120 100 Dynamic 1 = Impedance Slope CONTROL Pin Voltage (V) Figure 32. CONTROL Pin I-V Characteristic 470 Ω 0-15 V NOTES: ...

  • Page 30

    TOP232-234 BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS 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 ...

  • Page 31

    Typical Performance Characteristics (cont.) BREAKDOWN vs. TEMPERATURE 1.1 1.0 0.9 -50 - 100 125 150 Junction Temperature (°C) INTERNAL CURRENT LIMIT vs. TEMPERATURE 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - ...

  • Page 32

    TOP232-234 Typical Performance Characteristics (cont.) MULTI-FUNCTION PIN VOLTAGE vs. CURRENT See 1 Expanded Version 0 -300 -200 -100 0 100 200 300 400 500 MULTI-FUNCTION Pin Current (µA) CONTROL CURRENT at START of CYCLE SKIPPING ...

  • Page 33

    Typical Performance Characteristics (cont.) C OSS vs. DRAIN VOLTAGE 1000 100 10 0 200 DRAIN Voltage (V) DRAIN CAPACITANCE POWER (132 kHz) Scaling Factors: TOP234 1.00 TOP233 0.67 TOP232 0.33 400 600 TOP232-234 Scaling Factors: 300 TOP234 1.00 TOP233 0.67 ...

  • Page 34

    TOP232-234 .400 (10.16) .146 (3.71) .415 (10.54) .156 (3.96) + .860 (21.84) .880 (22.35) PIN 1 .050 (1.27) BSC .150 (3.81) BSC .050 (1.27) .050 (1.27) .050 (1.27) .200 (5.08) PIN 1 .150 (3.81) Y07B MOUNTING HOLE PATTERN B 34 ...

  • Page 35

    D S .004 (.10) -E- .245 (6.22) .255 (6.48) Pin 1 .375 (9.53) -D- .385 (9.78) .128 (3.25) .132 (3.35) -T- SEATING PLANE .100 (2.54) BSC .048 (1.22) .053 (1.35) .014 (.36) ⊕ .010 (.25) ...

  • Page 36

    ... Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any license under its patent rights or the rights of others. ...