전자부품 데이터시트 검색엔진 |
|
LC5210D 데이터시트(PDF) 6 Page - Sanken electric |
|
LC5210D 데이터시트(HTML) 6 Page - Sanken electric |
6 / 16 page 6 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 |
유사한 부품 번호 - LC5210D |
|
유사한 설명 - LC5210D |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |