NCL30083(2013_02) 데이터 시트보기 (PDF) - ON Semiconductor

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NCL30083
(Rev.:2013_02)

Dimmable Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting with Thermal Fold-back

ON Semiconductor 

NCL30083

At startup, when VCC reaches VCC(on), the controller is

not allowed to start pulsing for at least 180 ms in order to

allow the SD pin voltage to reach its nominal value if a

filtering capacitor is connected to the SD pin. This is to avoid

flickering of the LED light in case of over temperature.

VCC

Vdd

Dz

IOTP(REF)

SD

NTC

Rclamp

Vclamp

VOVP

noise delay

OVP

OTP_Timer end

noise delay

OTP

4−s Timer

S

Q

Q

R

OFF

0.5 V if OTP low

VOTP 0.7 V if OTP high

(OTP latched for version A)

S

Q

Q

Latch

VTF

R

VCCreset

Figure 58. Thermal Fold−back and OVP/OTP Circuitry

In case of over voltage, the Zener diode starts to conduct

and inject current inside the internal clamp resistor Rclamp

thus causing the pin SD voltage to increase. When this

voltage reaches the OVP threshold (2.5 V typ.), the

controller shuts−down and waits for at least 4 seconds before

restarting switching.

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