L6598D データシートの表示（PDF） - STMicroelectronics
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L6598D Datasheet PDF : 17 Pages
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L6598
3.4 OP AMP Section
The integrated OP AMP is designed to offer Low Output Impedance, wide band, High input Impedance and wide
Common Mode Range. It can be readily used to implement protection features or a closed loop control. For this
purpose the OP AMP Output can be properly connected to Rfmin pin to adjust the oscillation frequency.
3.5 Comparators
Two CMOS comparators are available to perform protection schemes. Short pulses (>= 200ns) on Comparators
Input are recognised. The EN1 input (active High), has a threshold of 0.6V (typical value) forces the device in a
latched shut down state (e.g. LVG Low, HVG low, Oscillator stopped), as in the Under Voltage Conditions. Nor-
mal Operating conditions are resumed after a power-off power-on sequence. The EN2 input (active high), with
a threshold of 1.2V (typical value) restarts a Soft Start sequence (see Timing Diagrams). In addition the EN2
Comparator, when activated, removes a latched shutdown caused by EN1.
Figure 15. Switching Time Waveform Definitions
90%
90%
HVG
90%
10%
tr
90%
10%
tf
LVG
10%
tr
10%
tf
Figure 16. Dead Time and Duty Cycle Waveform Definition
T1
td
td
D98IN898
Dc = T1
Tperiod
HVG
50%
50%
LVG
50%
50%
Tperiod
50%
D98IN899
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