top412 Power Integrations, Inc., top412 Datasheet - Page 11

• Manufacturer Part Number: top412
• Description: Three-terminal Dc To Dc Pwm Switch
• Manufacturer: Power Integrations, Inc.

NOTES:
A. For specifications with negative values, a negative temperature coefficient corresponds to an increase in
B. It is possible to start up and operate TOPSwitch at DRAIN voltages well below 36 V. Refer to the "Low Input
C. This section specifies only parameters affected by low input voltage operation (Drain Voltages less than 36 V). All
D. For low input voltage applications, the primary peak current could be set to a lower value than the current limit to
DRAIN Supply
Voltage
CONTROL Pin
Charging Current
Auto-restart
Duty Cycle
Auto-restart
Frequency
LOW INPUT VOLTAGE OPERATION (See Note C)
magnitude with increasing temperature, and a positive temperature coefficient corresponds to a decrease in
magnitude with increasing temperature.
Voltage" Specification section for details.
other parameters remain unchanged.
increase efficiency. Refer to the Output Characteristics graph (Drain Current vs. Drain Voltage). The voltage
across the transformer primary during the ON time is the difference between the input voltage and the drain
voltage (V
For example, if the input voltage is 16 VDC and a TOP414 (2.95 A minimum current limit) is used at a primary
peak current of 1A. Then the (V
primary is 13 V.
Specification
DS(ON)
).
Symbol
DS(ON)
) is 3 V at 100 °C and the energizing voltage across the transformer
(Unless Otherwise Specified)
T
J
VS2 = 16 V R1 = 0 Ω
= 25 °C
T
See Note D
SOURCE = 0 V
J
Conditions
See Figure 11
= -40 to 125 °C
S1/Open
S1/Open
V
V
C
C
= 0 V
= 5 V
-2.30
-1.20
Min
16
-1.65
-0.64
Typ
0.85
4
TOP412/414
Max
-1.00
-0.28
8
Units
4/99
Volts
mA
mA
A
Hz
%
11