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PDF TFC718 Data sheet ( Hoja de datos )

Número de pieza TFC718
Descripción Switching Power Supply Controller
Fabricantes TFC Micro-Elec 
Logotipo TFC Micro-Elec Logotipo



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No Preview Available ! TFC718 Hoja de datos, Descripción, Manual

TFC718 Switching Power Supply Controller
www.DataSheet4U.com
12/06/2005
Tianfeng Science & Technology
YinXin Electronic.,Ltd
Data Sheet
TFC718 Switching Power Supply Controller
TFC Micro-Elec.
TEL:02083295493 FAX:02083295491
Tianfen

1 page




TFC718 pdf
TFC718 Switching Power Supply Controller
www.DataSheet4U.com
12/06/2005
Definitions of Electrical Characteristics
Enabling reception current: The current on OE point when OB starts to have a 0.1mA pull-down current in the
enabling stage.
Enabling static current: The minimum power supply current when VCC connects to filter capacitor and
adjustable power supply, CT connects to 680PF and other pins unconnected to enable the oscillation of VCC
(i.e. enable the start-up of TFC718)
Enabling Voltage: The maximum VCC value of the above-mentioned VCC oscillation.
Re-enabling voltage: The minimum VCC value of the above mentioned VCC oscillation.
Oscillator turn-off voltage: The VCC value causing the stop of oscillator when the above-mentioned
oscillation falls to the edge.
Static current: VCC power supply current when FB connects to ground through 1.8K resistor in normal stage.
Oscillator pull-up/pull-down current: The pull-up/pull-down current at CT when FB = 2.5V, CT = 1.25V in
normal stage.
Over-
current
Global Oscillogram (Figure 2)
FB pull-up current: In normal stage, when FB = 2.5V, IS = 0V, FB will be pull-up current.
FB anti-upper limit current: In normal stage, when FB = 2.5V, IS = 0.8V, FB will be pull-down current.
Internal feedback power supply voltage: No-external standby feedback circuit of the power source TFC718. In
normal stage, it is the VCC value.
IS upper limit voltage: When FB = 2.5V, add from outside the adjustable power supply to IS, the minimum IS
voltage of the pull-down current at FB.
Slope current driving: Referring to that OB open current of the power tube is the function of IS, when IS = 0V,
OB open current is approximately 40mA, then OB open current will increase along with IS linearly, when IS
raises to 0.6V, OB open current is approximately 120mA.
Oscillator Cycle: The function of CT’s external capacitor CT, about CT * 24000 seconds.
Electrical Characteristics
Symbol
Item
lcs Enabling Reception Current
Enabling Static Current
Enabling voltage
Oscillator Turn-off Voltage
Re-enabling voltage
Test Condition
Min Typ Max Unit
1.6 2.0 2.4 mA
55 80 uA
8.6 8.8 9.0 V
4.1 4.28 4.45 V
3.7 V
TEL:02083295493 FAX:02083295491
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