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LC5210D 데이터시트(PDF) 6 Page - Sanken electric

부품명 LC5210D
상세설명  Off-Line LED Driver ICs
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제조업체  SANKEN [Sanken electric]
홈페이지  http://www.sanken-ele.co.jp/en
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SANKEN ELECTRIC CO., LTD.
LC5200-DS, Rev. 6.0
Off-Line LED Driver ICs
LC5200 Series
This section describes the functions displayed in the Functional
Block diagram.
Regulator
This regulator steps-down from the supply voltage, VBB , to 12 V,
and provides power to internal circuits and external devices. A
ceramic capacitor of 0.1 μF should be connected close to the
REG pin to stabilize operation because some pulse currents flow
through the gate capacitor when charging the internal power
MOSFET.
Current Control
The output current is controlled constant in internal PWM mode,
by comparing the REF pin voltage with the SEN pin voltage.
Undervoltage Lockout (UVLO)
This continually monitors whether the output voltage from the
Regulator function is normal, and prevents abnormal operation
resulting from low input voltage. When the VBB pin voltage is
lower than the UVLO threshold (Turn-off), VUVLO(OFF) , the IC
reverts to the state before startup. In addition, this function is
available during power-on reset, for releasing latched shutdowns
resulting from operation of protection functions.
Thermal Shutdown (TSD)
This continually monitors the chip temperature of the Control
Part. When the temperature increases to TTSD or higher, the
output of the OUT pin turns off to prevent damage from abnor-
mally high temperature. After TSD operation, when the tempera-
ture decreases to TTSD minus TTSD(HYS) or lower, or after cycling
power to the IC (that is, the VBB pin voltage falling down to
VUVLO(OFF) and then rising to VUVLO(ON)), the IC returns to nor-
mal operation.
Because this circuit is in the Control Part, there is a delay
before temperature increases in the internal power MOSFET are
conducted to the Control Part. If the temperature of the power
MOSFET increases rapidly, the power MOSFET may be dam-
aged before TSD is activated. Therefore, it is necessary design
the application well to protect against this.
Overcurrent Protection (OCP)
The drain current is detected by the current detection resistor,
RS . When the SEN pin voltage, VSEN , reaches the OCP detection
voltage, VOCP, or more, the OCP function is activated, and thus
the output of the OUT pin turns off, in latch mode. To release
latch mode, cycling power to the IC (that is, the VBB pin volt-
age falling down to VUVLO(OFF) and then rising to VUVLO(ON)) is
required.
Note: The OCP function is activated only when the SEN pin
voltage, VSEN , reaches VOCP by excessive output current flowing
to RS . Therefore if the output current is restricted to less than its
target value, for example by current limitations of the inductor,
even though the LEDs are shorted, OCP would not be activated.
Logic
This controls the enabling and disabling of the output of the OUT
pin according to signals from the current control circuit and/or
the various protection circuits. The output is enabled only when
the operation is normal and the current control circuit outputs the
on-signal for the OUT pin.
Gate Driver Operation
Gate driver for internal power MOSFET.
Internal Power MOSFET
An internal power MOSFET for LED driving is incorporated in
the IC series, according to the individual product ratings for cur-
rent and voltage.
Internal Circuit Descriptions


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