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HA17384SPS Datasheet(PDF) 29 Page - Hitachi Semiconductor

Part No. HA17384SPS
Description  High Speed Current Mode PWM Control IC for Switching Power Supply
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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HA17384SPS Datasheet(HTML) 29 Page - Hitachi Semiconductor

 
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HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
29
Output
Input
Time constant
circuit
Feedback
HA17384
Series
VIN
VIN
18V
RB
51
CN
CB
1
µF
GND
+
Figure 17 Sample Remedial Circuit
2. Externally Synchronized Operation
• Case
When, with a power supply using the HA17384S/H or HA17385H, externally synchronized operation is
performed by applying an external syncronous signal to the R
T/CT pin (pin 4).
• Problem
Synchronized operation may not be possible if the amplitude of the external syncronous signal is too
large.
• Reason
The R
T/CT pin falls to a potential lower than the ground.
• Remedy (counter measure)
In this case, clamping is necessary using a diode with as small a V
F value as possible, such as a schottky
barrier diode, as shown in figure 18.
Vref
0.01
µF
RT
CT
47
HA17384
Series
External
synchronous
signal
Figure 18 Sample Remedial Circuit


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