TN5D41A Sanyo Semiconductor Corporation, TN5D41A Datasheet - Page 10

• Manufacturer Part Number: TN5D41A
• Description: Separately-excited Step-down Switching Regulator 5v Output Type
• Manufacturer: Sanyo Semiconductor Corporation

Continued from preceding page.
SS terminal (5 pin) also acts as standby mode switch. By setting SS terminal (5 pin) voltage to be equal or less than
0.3Vtyp, the output ON/OFF is able to be controlled by external signals.
Points to Remember in Pattern Designing
In addition, confirmation of the following points is necessary in actual circuit.
1) Transient large current flows to V IN terminal (1 pin), so we recommend the input capacitor should be 3000μF and
2) Large current flows to C1A to C, V IN terminal (1 pin) of IC1, SWOUT terminal (3 pin), D1, L1, and C2A. So, the
3) FB terminal (4 pin) of IC1 is the feedback terminal from output voltage. It should be near to the output capacitor
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1) How the output ON/OFF control operates and its effects.
2) Is there any malfunction due to the ambient temperature change of each device or exogenous noises?
For the purpose of ensuring the stability of oscillation, a capacitor should be inserted between SS terminal (5 pin) and
GND terminal (2 pin).
The absolute maximum rated voltage of SS terminal (5 pin) is 7V. The absolute maximum rated voltage of FB
terminal (4 pin) is within the range of 5 to 30V according to the output voltage type. When a voltage equal or
higher than the rated value is applied to SS terminal (5 pin) or FB terminal (4 pin) in some cases such as abnormal
test, protection measures like inserting fuses should be taken.
The built-in over-heat protection is a function to prevent the circuit from overheat state caused by transient
temperature rise, but not a function to prevent from abnormal caused by a sudden heat generation. In addition,
the reliability of over-heat protection function is not guarantee.
above. In addition, (+) (-) terminals of the input capacitor should be set near to V IN terminal (1 pin) and GND
terminal (2 pin).
wiring should be thick and short.
C2A.
GND
V IN
FUSE
F1
+
ON/OFF Control Circuit Example
1
2 3 4
IC1
TN5D41A
5
NPN
+
V OUT
Signal
GND
IT12641
No. A1029-10/11