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SSL5021BTS Datasheet(PDF) 9 Page - NXP Semiconductors |
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SSL5021BTS Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 20 page SSL5021BTS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 2 — 11 March 2015 9 of 20 NXP Semiconductors SSL5021BTS Compact low-ripple buck LED driver IC 8.7 Supply management The IC starts up when the voltage on the VCC pin increases to exceed Vstartup. The IC locks out (stops switching) when the voltage on the VCC pin drops to below Vth(UVLO). The hysteresis between the start and stop levels allows the VCC capacitor to supply the IC during zero-crossings of the mains. The SSL5021BTS incorporates an internal clamping circuit to limit the voltage on the VCC pin. The clamp limits the voltage on the VCC pin to the maximum value, Vclamp(VCC). If the maximum current of the external resistor minus the current consumption of the IC is lower than the limiting value of IVCC in Table 4, no external Zener diode is required. 8.8 PTC or NTC function and high-temperature foldback The PTC function or NTC function can be used as a control method for LED thermal protection. The PTC resistor which is connected to DEMOVP pin senses the temperature. When the voltage on DEMOVP pin is higher than the foldback level (Vth(fold)), the on-time is reduced with the increased DEMOVP pin voltage. Then the average LED current is reduced. When the temperature keeps increasing, the Vth(ovp) is exceeded. The converter stops switching. The IC restarts when OVP is triggered. This feature is optional as shown in Figure 7 and Figure 8. PTC is normally shorted. |
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