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12. Current Limit
This function operates when the output voltage reaches the current limit detection voltage (V
It is detected by the resistor R
Current value which over current
protection operates (I
When R
=0.51Ω, I
F
0.3V
During the current limit operation, the operation mode is moved to PWM OFF state by turning off the upper
output power transistor. The operation resumes at the next PWM ON timing.
Masking time is configured to avoid malfunction by noise.
RS端子
Voltage of
電圧
RS pin
Detection
電流リミット
term of
検出期間
current limit
Internal
内部
PWM
PWM
OUT1
OUT2
.
F
Over current detection voltage (V
=
)
OUT
=0.3V (typ)/0.51Ω=588mA
OUT
VM
RS
R
F
I
1.5μs
2us
OFF
（Hi-Z)
(In case HP = L and HM = H)
Detection resistance (R
OUT1
OUT2
OUT
OFF
OFF
（Hi-Z)
（Hi-Z)
22
TC78B002FNG
RS
)
RS
)
F
M
0.3V (typ)
OFF
（Hi-Z)
= 0.3 V (typ)).
2013-10-17
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