PJ3842B(2002) 查看數據表（PDF） - Promax Johnton
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PJ3842B Datasheet PDF : 15 Pages
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PJ3842B
High Performance Current Mode Controller
FIGURE 17-REPRESENTATIVE BLOCK DIAGRAM
Pin numbers adjacent to terminals are for the 8 pin dual-in-line package.
Pin numbers in parenthesis are for the SOP-14 package.
FIGURE 18-TIMING DIAGRAM
UNDERVOLTAGE LOCKOUT
Two undervoltage lockout comparators have been
incorporat ed to guarantee that the IC is fully functional before
the output stage is enabled. The positive power supply
terminal (VCC) and the referen ce output (Vref) are each
monitored by separate comparators.Each has built-in
hysteresis to prevent erratic output behavior as their
respective thresholds are crossed. The large hysteresis and
low start-up current of the PJ3842B makes it ideally suited in
off-line converter applications where effi cient bootstrap start -
up technique (Figure 33). 36 V zener is connected as a shunt
regulator from VCC to ground.Its purpose is to protect the IC
from excessive voltage that can occur during system start-up.
The minimum operating voltage for the PJ3842B is 11V.
7-15
2002/01.ver.A
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