TOP412GN-TL Power Integrations, TOP412GN-TL Datasheet



Manufacturer Part Number
Power Integrations
Step-Down (Buck), Step-Up (Boost), Flyback, Forward Converterr

Specifications of TOP412GN-TL

Internal Switch(s)
Synchronous Rectifier
Number Of Outputs
Frequency - Switching
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SMD Gull Wing
Output Voltage
5.8 V
Input / Supply Voltage (max)
265 VAC
Input / Supply Voltage (min)
85 VAC
Duty Cycle (max)
70 %
Switching Frequency
120 KHz
Supply Current
1.2 mA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
Voltage - Output
Voltage - Input
Power - Output
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
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TOPSwitch Family
Three-terminal DC to DC PWM Switch
Low Cost Replacement for Discrete Switchers
• Up to 15 fewer components - cuts cost, increases reliability
• Allows for a smaller and lighter solution under 12 mm
Over 80% Efficiency in Flyback Topology
• Built-in start-up and current limit reduce DC losses
• Low capacitance MOSFET cuts switching losses
• CMOS controller/gate driver consumes only 7 mW
• 70% maximum duty cycle minimizes conduction losses
Simplifies Design - Reduces Time to Market
• Integrated PWM Controller and high power MOSFET
• Only one external capacitor needed for compensation,
System Level Fault Protection Features
• Auto-restart and cycle by cycle current limiting functions
• On-chip latching thermal shutdown protects the entire
Highly Versatile
• Implements Buck, Boost, Flyback or Forward topology
• Easily interfaces with both opto and primary feedback
• Supports continuous or discontinuous mode of operation
• Specified for operation down to 16 V DC input
The TOPSwitch family implements, with only three terminals,
all functions necessary for a DC to DC, converter: high voltage
N-channel power MOSFET with controlled turn-on gate driver,
voltage mode PWM controller with integrated 120 kHz oscillator,
high voltage start-up bias circuit, bandgap derived reference,
bias shunt regulator/error amplifier for loop compensation and
fault protection circuitry. Compared to discrete MOSFET and
controller or self oscillating (RCC) switching converter solutions,
a TOPSwitch integrated circuit can reduce total cost, component
count, size, weight and at the same time increase efficiency and
system reliability.
Cablecom and other DC to DC converter applications up to
height, all surface mount components
bypass and start-up/auto-restart functions
handle both primary and secondary faults
system against overload
Product Highlights
This device is well suited for Telecom,
Figure 1. Typical Application.
Table 1. TOP412/414 Output Power.
Notes: 1. Assumes maximum junction temperature of 100 °C
2. Assumes output of 5 V and K
(645 mm
power capability in a given application depends on thermal
environment, transformer design, efficiency required, input storage
capacity, etc.
21 W of output power. Internally, the lead frame of the
SMD-8 package uses six of its pins to transfer heat from the chip
directly to the board, eliminating the cost of a heat sink.
36 VDC
72 VDC
18 VDC
24 VDC
90 VDC
48 VDC
60 VDC
), 2 oz. copper clad (610 gm/mm
Output Power Capability
12 W
15 W
18 W
3 W
5 W
7 W
9 W
of 0.4 3. Soldered to 1 sq. inch
) 4. The continuous
12 W
15 W
18 W
21 W
4 W
6 W
9 W
April 1999

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TOP412GN-TL Summary of contents

Page 1

TOP412/414 TOPSwitch Family Three-terminal PWM Switch Product Highlights Low Cost Replacement for Discrete Switchers • fewer components - cuts cost, increases reliability • Allows for a smaller and lighter solution under 12 mm height, ...

Page 2

TOP412/414 V C CONTROL Z C SHUNT REGULATOR/ ERROR AMPLIFIER - + 5 OSCILLATOR D MAX CLOCK SAW R E Figure 2. Functional Block Diagram. Pin Functional Description DRAIN Pin: Output MOSFET drain connection. Provides internal bias ...

Page 3

TOPSwitch Family Functional Description TOPSwitch is a self biased and protected linear control current- to-duty cycle converter with an open drain output. High efficiency is achieved through the use of CMOS and integration of the maximum number of functions possible. ...

Page 4

TOP412/414 TOPSwitch Family Functional Description (cont.) The first time V reaches the upper threshold, the high-voltage C current source is turned off and the PWM modulator and output transistor are activated, as shown in Figure 5(a). During normal operation (when ...

Page 5

DRAIN 0 V OUT 0 I OUT Figure 6. Typical Waveforms for (1) Normal Operation, (2) Auto-restart, (3) Latching Shutdown, and (4) Power Down Reset. CONTROL ...

Page 6

TOP412/414 General Circuit Operation Figure 7 shows a typical DC-DC converter application using the TOP414G. This supply delivers and works over a wide input range from 36-72 VDC. The power supply operates at an ambient ...

Page 7

Key Application Issues Use a Kelvin connection to the SOURCE pin for the CONTROL pin bypass capacitor. Use single point grounding techniques at the SOURCE pin as shown in Figure 8. Use a ceramic high frequency decoupling capacitor to bypass ...

Page 8

TOP412/414 DRAIN Voltage ............................................ -0.3 to 350 V CONTROL Voltage ..................................... - 0 Storage Temperature ..................................... -65 to 150 °C Notes: 1. All voltages referenced to SOURCE Normally limited by internal circuitry. 3. 1/16" ...

Page 9

Specification Symbol SHUTDOWN/AUTO-RESTART CONTROL Pin I C Charging Current Charging Current Temperature Drift Auto-restart V Threshold Voltage C(AR) UV Lockout Threshold Voltage Auto-restart Hysteresis Voltage Auto-restart Duty Cycle Auto-restart Frequency CIRCUIT PROTECTION Self-protection I Current Limit LIMIT Leading Edge t ...

Page 10

TOP412/414 Specification Symbol OUTPUT ON-State R Resistance DS(ON) OFF-State I Current DSS Breakdown BV Voltage DSS Rise t Time R Fall t Time F SUPPLY DRAIN Supply Voltage Shunt Regulator V Voltage C(SHUNT) Shunt Regulator Temperature Drift I CD1 CONTROL ...

Page 11

Specification Symbol LOW INPUT VOLTAGE OPERATION (See Note C) DRAIN Supply Voltage CONTROL Pin Charging Current Auto-restart Duty Cycle Auto-restart Frequency NOTES: A. For specifications with negative values, a negative temperature coefficient corresponds to an increase in magnitude with increasing ...

Page 12

TOP412/414 90% DRAIN VOLTAGE 10 Figure 9. TOPSwitch Duty Cycle Measurement. D CONTROL TOPSwitch S NOTES: 1. This test circuit is not applicable for current limit or output characteristic measurements. 2. For P ...

Page 13

BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS The following precautions should be followed when testing TOPSwitch by itself outside of a power supply. The schematic shown in Figure 11 is suggested for laboratory testing of TOPSwitch. When the DRAIN ...

Page 14

TOP412/414 Typical Performance Characteristics (cont.) OUTPUT CHARACTERISTICS 5 T CASE = 25 ° CASE = 100 ° Drain Voltage ( 4/99 Scaling Factors: TOP414 1.00 TOP412 0.67 8 ...

Page 15

D S .004 (.10 - G08A J2 .010 (.25 SMD-8 Heat Sink is 2 oz. Copper As Big As Possible .046 .060 .060 .046 ...

Page 16

... 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. ...

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