SSL5001T/1J

SSL5001T Compact non-dimmable LED controller IC Rev. 2 — 26 June 2014 Product data sheet 1. General description The SSL5001T is an Integrated Circuit (IC) for driving LED lamps in general lighting applications. It operates in fixed frequency mode. Frequency jitter is implemented to reduce ElectroMagnetic Interference (EMI). The main benefits of this IC include: • • • • • • Constant power mode applications support Small Printed-Circuit Board (PCB) footprint and compact solution High efficiency (85 % typical) Ease of integration and many protection features Low electronic Bill Of Material (BOM) Constant current and constant voltage operation possible using an optocoupler The VINSENSE and PROTECT pins are reserved for protection purposes. Input UnderVoltage Protection (UVP), input OverVoltage Protection (OVP), output OVP and output OverTemperature Protection (OTP) can be implemented using a minimum of external components. The IC provides output power control to 10 % LED current accuracy. The IC has many protection features including easy LED temperature feedback with an external PTC. Remark: All values are typical values unless otherwise stated 2. Features and benefits  LED controller IC for driving strings of LEDs or high-voltage LED modules from a rectified mains supply  Part of a high-efficiency switch mode flyback or buck/boost product family.  Controller-only which can drive an external MOSFET  Very low supply current during start-up and restart (10 A)  Low supply current during normal operation (0.5 mA without load)  Applicable in buck/boost and flyback topologies  Fast transient response through cycle-by-cycle current control:  Low AC mains ripple in LED current  No over or undershoots in the LED current  Internal protection and features:  UnderVoltage LockOut (UVLO)  Leading Edge Blanking (LEB)  General purpose protection input SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC  OverCurrent Protection (OCP)  Open output protection  Fixed switching frequency with frequency jitter to reduce EMI  Frequency reduction with fixed minimum peak current to maintain high-efficiency at low output power levels  Internal OverTemperature Protection (OTP)  Mains UnderVoltage Protection (UVP) and OverVoltage Protection (OVP)  Output Short Protection (OSP)  Low component count (see Figure 3) LED driver solution:  Easy external temperature protection with a PTC  Option for soft-start function  IC lifetime easily matches or surpasses LED lamp lifetime 3. Applications The SSL5001T is intended for compact LED lamps with fixed power output for single mains input voltages. Mains input voltages include 100 V, 120 V and 230 V (AC) depending on the voltage rating of the external components. The power range is determined using external components. For a rated power higher than 25 W, additional mains current conditioning circuitry can be required. 4. Quick reference data Table 1. Quick reference data Symbol Parameter Conditions Min Typ Max Unit VCC supply voltage operating range 14 - 25 V ICC supply current no load on pin DRIVER 0.4 0.5 0.6 mA fconv conversion frequency 62 66.5 71 kHz 9 10.5 12 V VO(DRIVER)max maximum output voltage VCC > VCC(startup) on pin DRIVER 5. Ordering information Table 2. Ordering information Type number SSL5001T SSL5001T Product data sheet Package Name Description Version SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1 All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 2 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 6. Block diagram 9&&VWDUW 9&&  9&&VWRS 9 9 FODPS  273 UHVWDUW 9 '59 VHW 233VZLWFK įPD[ —$ 6 VHW 4 4 5 %/$1. VRIWVWDUW VRIWVWDUW ODWFK /(% 9FWUO,SHDN 2&3 ODWFK 29(532:(5 &255(&7,21 9,16(16( 4 5 $1$/2* &21752/ 273 SURWKLJK SURWORZ 6  VWRS 02'8/$7,21 Nȍ 9&&VWRS RYHUSRZHU KLJKYLQ ORZYLQ 9&&VWDUW SRZHUGRZQ ORZYLQ SURWORZ 6 UHVWDUW  —$ 9FWUO,SHDN UHVWDUW VWRS įPD[ 5 26&,//$725 IUHTXHQF\UHGXFWLRQ 237,0(5 99 SRZHUGRZQ  237,0(5 9 233VZLWFK 7(03(5$785( 3527(&7,21  5(67$57 &21752/ 6285&( —$ 4 GULYHU ODWFKUHVHW 9 ODWFK FODPS '5,9(5 ' P9 RYHUSRZHU 9 *1' 9FWUO,SHDN 9 ODWFKUHVHW 6/23( &203(16$7,21 SURWKLJK  &75/  —$ 99 SURWORZ  3527(&7  —$ KLJKYLQ 9 ORZYLQ 99  9,16(16( ',*,7$/&21752/ DDD Fig 1. SSL5001T block diagram SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 3 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 7. Pinning information 7.1 Pinning 9&&  *1'   237,0(5  &75/ ,& '5,9(5   3527(&7 6285&(   9,16(16( DDD Fig 2. SSL5001T pin configuration 7.2 Pin description Table 3. SSL5001T Product data sheet Pin description Symbol Pin Description VCC 1 supply voltage GND 2 ground DRIVER 3 gate driver output SOURCE 4 current sense input VINSENSE 5 input voltage protection input PROTECT 6 general-purpose protection input CTRL 7 control input OPTIMER 8 overpower and restart timer All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 4 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 8. Functional description 8.1 Introduction The SSL5001T is a buck-boost and flyback driver for small form factor retrofit SSL lamps and separate LED drivers. 8.2 Converter operation The converter in the SSL5001T is a low-cost fixed frequency, peak current controlled system. See Figure 3 for the basic application diagram. See Figure 5 for the waveforms. To reduce ElectroMagnetic Interference (EMI), frequency jitter has been implemented. Energy is stored in inductor L each period that the switch is on. The inductor current IL is zero when the MOSFET is switched on. The amplitude of the current build-up in L is proportional to the voltage difference across the inductor and the time that the MOSFET switch is on. When the MOSFET is switched off, the current continues to flow through the output diode. The current then falls at a rate proportional to the value of VOUT and the flyback transformer winding ratio. / & 5 6 & 5 = & 5 5 9,16(16(   6285&( 3527(&7   '5,9(5 &75/  ,& & &  *1' 5  9&& 237,0(5  5 5 & & 5 & = 5 37& 5 5 Fig 3. DDD SSL5001T basic low ripple buck-boost application diagram 8.3 Conversion frequency The SSL5001T is operating in the Fixed frequency mode. The inductance value has no influence on the operating frequency. The maximum inductance applicable is determined by the operating point (71 kHz) at which DCM operation can be guaranteed. 8.4 DRIVER pin The SSL5001T is equipped with a driver that can control an external MOSFET switch. The voltage on the driver output pin is increased towards Vo(DRIVER)max to open the switch during the first cycle (t0 to t1). The voltage on the driver output pin is pulled down towards a low level from the start of the secondary stroke until the next cycle starts (t0 to t00). SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 5 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC The driver circuit to the power MOSFET gate has a current sourcing capability of 300 mA and a current sink capability of 750 mA. This enables efficient operation due to the fast power MOSFET switch-on and switch-off. At the lowest VCC voltage (VCC(stop)), the voltage of the driver is VO(DRIVER)min. 9*$7( 9287 9'5$,1 9,1  PDJQHWL]DWLRQ GHPDJQHWL]DWLRQ ,/    W W  W  W W 7 DDD Fig 4. Buck-boost waveforms 8.5 Protective features The IC has the following protections: • • • • • • • UnderVoltage LockOut (UVLO) Output OverVoltage Protection (OVP) Leading Edge Blanking (LEB) OverCurrent Protection (OCP) Internal OverTemperature Protection (OTP) Mains UnderVoltage Protection (UVP) and OverVoltage Protection (OVP) Output Short Protection (OSP) The internal OTP is a latched protection. This protective feature causes the IC to halt until a reset (a result of power cycling) is executed. When VCC drops lower than VCC(rst), the IC resets the latch protection mode. Switching starts only when no fault condition exists. 8.5.1 UnderVoltage LockOut (UVLO) When the voltage on the VCC pin drops lower than VCC(stop), the IC stops switching. A restart attempt is made after the external resistor fully recharges the VCC capacitor. At an output short-circuit the auxiliary voltage is reduced significantly, depending on the coupling of the transformer. As a result the UVLO is activated providing an adequate short-circuit protection. SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 6 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 8.5.2 Leading Edge Blanking (LEB) To prevent false detection of overcurrent, a blanking time following switch-on is implemented. When the MOSFET switch turns on there can be a short current spike due to capacitive discharge of voltage over the drain and source. During the LEB time (tleb), the spike is disregarded. 8.5.3 OverCurrent Protection (OCP) The SSL5001T contains a peak current detector. It triggers when the voltage at the SOURCE pin reaches the peak-level Vth(ocp)SOURCE. The current through the switch is sensed using a resistor connected to the SOURCE pin. The sense circuit is activated following LEB time tleb. There is a propagation delay between overcurrent detection and the actual closure of the switch td(ocp-swoff). Due to the delay, the actual peak current is slightly higher than the OCP level set using the resistor in series to the SOURCE pin. This effect can be compensated by the mains overpower compensation as described in Section 8.5.6. 8.5.4 OverTemperature Protection (OTP) When the internal OTP function is triggered at a certain IC temperature (Tth(act)otp), the converter stops operating. OTP is a latched protection which is reset by removing the voltage from the VCC pin. 8.5.5 Mains UnderVoltage Protection (UVP) Mains undervoltage protection is designed to limit the lamp power when the input voltage drops too low. Since the input power has to remain constant, the input current would otherwise increase to a level that is too large for the input circuitry. 8.5.6 Mains OverPower Compensation (OPC) The overpower compensation function can be used to realize a maximum output power which is nearly constant over the full mains input. The overpower compensation circuit measures the input voltage on the VINSENSE pin and outputs a proportionally dependent current on the SOURCE pin (see Figure 5). The DC voltage across the soft-start resistor limits the maximum peak current on the current sense resistor.   ,6285&(     99,16(16(9  DDD Fig 5. SSL5001T Product data sheet Overpower compensation using the VINSENSE and SOURCE pins All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 7 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 8.5.7 Protection input (PROTECT PIN) The PROTECT pin is a general-purpose input which can be used to switch off the converter (latched protection). The converter is stopped when the voltage on this pin is pulled above Vdet(H)(PROTECT) (0.8 V) or under Vdet(L)(PROTECT) (0.5 V). A current of 32 A flows from the IC when VPROTECT is at Vdet(L)(PROTECT). A current of 107 A flows into the IC, when VPROTECT is at Vdet(H)(PROTECT) level. The PROTECT input can be used to create overvoltage detection and OTP functions. Connect a 22 nF capacitor in parallel to a 1 M resistor to the PROTECT pin if the protective features of this pin are not used. An internal 4.1 V clamp protects this pin from overvoltage situations. 8.6 VCC supply The SSL5001T can be supplied using three methods: • Under normal operation, the voltage on the auxiliary winding is rectified and generates the VCC supply voltage • At start-up, an external resistor provides internal power until either the auxiliary supply or an external current on the VCC pin provides the supply • An external voltage source can be connected to the VCC pin Initially, the capacitor on the VCC pin is charged from the high-voltage mains via resistor R3. If VCC is lower than Vstartup, the IC current consumption is low (10 A). When VCC reaches Vstartup, the IC first waits for the VINSENSE pin to reach Vstart(VINSENSE) and the PROTECT pin to reach Vdet(L)(PROTECT). When both levels are reached, the IC charges the SOURCE pin to the Vstart(soft) level and starts switching. In a typical application, the supply voltage is taken over by the auxiliary winding of the transformer. If a protection is triggered, the controller stops switching. Depending on the triggered protection, a restart or latch to an off-state is activated. A restart caused by a protection rapidly charges the OPTIMER pin to 4.5 V. The IC enters Power-down mode until the OPTIMER pin discharges to 1.2 V. In Power-down mode, the IC consumes a very low supply current (10 A) and the VCC pin is clamped at 22 V using an internal clamp circuit. When the voltage on the OPTIMER pin drops under 1.2 V and the VCC pin voltage is higher than the VCC start-up voltage (see Figure 4), the IC restarts. Connect a 180 k resistor between the OPTIMER pin and the ground for poper operation. The parallel capacitor can be chosen freely to set the desired hiccup frequency. When a latched protection is triggered, the IC immediately enters Power-down mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage (Vrst(latch) + 1 V). When the voltage on the VCC pin drops under Vth(UVLO) during normal operation, the controller stops switching and enters restart mode. In restart mode, the driver output is disabled and the VCC pin voltage is recharged using resistor R3 which is connected to the rectified mains. SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 8 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC Remark: The VCC clamp current of the IC is 240 A. As a result an external 30 V Zener clamp can be required in applications with a short start-up time. 9VWDUWXS 9WK89/2 9&& VRIWVWDUW VRIWVWDUW 6285&( 9GHW+9,16(16( 9,16(16( 9GHW+3527(&7 9GHW/3527(&7 3527(&7 9 9 237,0(5 92 FKDUJLQJ9&& FDSDFLWRU VWDUWLQJ FRQYHUWHU QRUPDO RSHUDWLRQ SRZHUGRZQ SURWHFWLRQ UHVWDUW DDD Fig 6. Start-up sequence, normal operation and restart sequence 8.7 Supply management All internal reference voltages are derived from a temperature compensated on-chip band gap circuit. The internal reference currents are derived from a trimmed and temperature compensated current reference circuit. 8.8 Soft-start function To prevent audible noise during start-up or a restart condition, a soft-start is made. Before the converter starts, the soft-start capacitor (C6, see Figure 9) on the SOURCE pin is charged. When the converter starts switching, the primary peak current slowly increases as the soft-start capacitor discharges through the soft-start resistor (R6, see Figure 9). The soft-start capacitor value selected sets the soft-start time constant. The soft-start resistor value must also be taken into account but overpower compensation typically defines this value (see Section 8.5.5). The soft-start resistor R5 must be at least 12 k to ensure a proper start-up. 8.9 Input voltage detection (VINSENSE pin) In a typical application, the mains input voltage can be detected by the VINSENSE pin. Switching does not take place until the voltage on VINSENSE has reached Vstart(VINSENSE) (0.94 V). When the VINSENSE voltage drops under Vdet(L)(VINSENSE) (0.72 V) or exceeds Vdet(H)(VINSENSE) (3.52 V), the converter stops switching and performs a restart. If pin VINSENSE is left open or disconnected, the pin is pulled up by the internal 20 nA current source to reach the Vdet(H)(VINSENSE) level. This triggers restart protection. An internal 5.2 V clamp protects the VINSENSE pin from overvoltages. SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 9 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 8.10 Duty cycle control (CTRL pin) The output power of the converter is regulated by the CTRL pin. This pin is connected to an internal 5.4 V supply using an internal 7 k resistor. The CTRL pin voltage sets the peak current which is measured using the SOURCE pin (see Section 8.11). At a low output power, the switching frequency is also reduced. The maximum duty cycle is limited to 72 %. 8.11 Current mode control (SOURCE pin) Current mode control is used for its good line regulation. The primary current is sensed by the SOURCE pin across an external resistor R9 (see Figure 9) and compared with an internal reference voltage. The internal reference voltage is proportional to the CTRL pin voltage (see Figure 7). DDD  96285&( 9  IUHTXHQF\ UHGXFWLRQ        9&75/9 Fig 7. Peak current control using pin SOURCE Leading edge blanking prevents false triggering due to capacitive discharge when switching on the external power switch (see Figure 8). WOHE 96285&(PD[ 96285&( W DDD Fig 8. SSL5001T Product data sheet Leading edge blanking using the SOURCE pin All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 10 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 9. Limiting values Table 4. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Conditions Min Max Unit supply voltage continuous 0.4 +30 V t < 100 ms - 35 V Voltages VCC VVINSENSE voltage on pin VINSENSE current limited 0.4 +5.5 V VPROTECT voltage on pin PROTECT current limited 0.4 +5 V VCTRL voltage on pin CTRL 0.4 +5.5 V VIO(OPTIMER) input/output voltage on pin OPTIMER 0.4 +5 V VSOURCE voltage on pin SOURCE current limited 0.4 +5 V ICC supply current pin VCC;  < 10 % - +0.4 A II(VINSENSE) input current on pin VINSENSE 1 +1 mA II(PROTECT) input current on pin PROTECT 1 +1 mA ICTRL current on pin CTRL 3 0 mA ISOURCE current on pin SOURCE 10 +1 mA IDRIVER current on pin DRIVER  < 10 % 0.4 +1 A Ptot total power dissipation Tamb < 75 C - 0.5 W Tstg storage temperature 55 +150 C Tj junction temperature 40 +150 C Tamb ambient temperature C Currents General SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 11 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC Table 4. Limiting values …continued In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Conditions electrostatic discharge voltage class 1 Min Max Unit ESD VESD human body model [1] - 4000 V machine model [2] - 300 V - 750 V charged device model [1] Equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor. [2] Equivalent to discharging a 200 pF capacitor through a 0.75 H coil and a 10  resistor. 10. Thermal characteristics Table 5. Thermal characteristics Symbol Parameter Conditions Typ Unit Rth(j-a) thermal resistance from junction to ambient in free air; JEDEC test board 150 K/W Rth(j-c) thermal resistance from junction to case in free air; JEDEC test board 79 K/W 11. Characteristics Table 6. Characteristics Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit Supply voltage management (VCC pin) Vstartup start-up voltage 18.6 20.6 22.6 V Vth(UVLO) undervoltage lockout threshold voltage 11.2 12.2 13.2 V Vclamp(VCC) clamp voltage on activated during restart pin VCC activated during latched protection - Vstartup + 1 - V - Vrst(latch) + 1 - V Vhys hysteresis voltage Vstartup  Vth(UVLO) 8 9 10 V ICC(startup) start-up supply current VCC < Vstartup 5 10 15 A ICC supply current no load on pin DRIVER 0.4 0.5 0.6 mA Vrst(latch) latched reset voltage 4 5 6 V SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 12 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC Table 6. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit detection level 0.89 0.94 0.99 V Input voltage sensing (VINSENSE pin) Vstart(VINSENSE) start voltage on pin VINSENSE Vdet(L)(VINSENSE) LOW-level detection voltage on pin VINSENSE 0.68 0.72 0.76 V Vdet(H)(VINSENSE) HIGH-level detection voltage on pin VINSENSE 3.39 3.52 3.65 V IO(VINSENSE) output current on pin VINSENSE - 20 - nA Vclamp(VINSENSE) clamp voltage on II(VINSENSE) = 50 A pin VINSENSE - 5.2 - V Protection input (PROTECT pin) Vdet(L)(PROTECT) LOW-level detection voltage on pin PROTECT 0.47 0.50 0.53 V Vdet(H)(PROTECT) HIGH-level detection voltage on pin PROTECT 0.75 0.8 0.85 V IO(PROTECT) output current on VPROTECT = Vlow(PROTECT) pin PROTECT VPROTECT = Vhigh(PROTECT) 34 32 30 A 87 107 127 A Vclamp(PROTECT) clamp voltage on II(PROTECT) = 200 A pin PROTECT 3.5 4.1 4.7 V for minimum flyback peak current 1.5 1.8 2.1 V for maximum flyback peak current 3.4 3.9 4.3 V [1] Peak current control (CTRL pin) VCTRL voltage on pin CTRL Rint(CTRL) internal resistance on pin CTRL 5 7 9 k IO(CTRL) output current on VCTRL = 1.4 V pin CTRL VCTRL = 3.7 V 0.7 0.5 0.3 mA 0.28 0.2 0.12 mA fosc oscillator frequency 62 66.5 71 kHz fmod modulation frequency 210 280 350 Hz fmod modulation frequency variation 3 4 5 kHz Pulse width modulator SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 13 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC Table 6. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter max maximum duty cycle Vstart(red)f frequency reduction start voltage V(zero) zero duty cycle voltage Conditions Min Typ Max Unit 68.5 72 79  CTRL pin 1.5 1.8 2.1 V CTRL pin 1.25 1.55 1.85 V Overpower protection (OPTIMER pin) Vprot(OPTIMER) protection voltage on pin OPTIMER 2.4 2.5 2.6 V Iprot(OPTIMER) protection current no overpower situation on pin OPTIMER overpower situation 100 150 200 A 12.2 10.7 9.2 A 0.8 1.2 1.6 V 4.1 4.5 4.9 V 127 107 87 A discharging OPTIMER capacitor 0.1 0 0.1 A V/t = 50 mV/s; VVINSENSE = 0.78 V 0.48 0.51 0.54 V V/t = 200 mV/s; VVINSENSE = 0.78 V 0.50 0.53 0.56 V 370 400 430 mV 17 25 33 mV/s 250 300 350 ns VVINSENSE = 1.25 V; VSOURCE(max) > 400 mV 1.0 - +0.1 A VVINSENSE = 2.75 V; VSOURCE(max) > 400 mV 2.6 - 1.0 A VVINSENSE = 4 V; VSOURCE(max) > 400 mV 2.2 - 1.9 A 63 55 47 A - Vsense(max) - V Restart timer (OPTIMER pin) Vrestart(OPTIMER) Irestart(OPTIMER) restart voltage on low-level pin OPTIMER high-level restart current on charging OPTIMER pin OPTIMER capacitor Current sense (SOURCE pin) VSOURCE(max) maximum voltage on pin SOURCE Vth(opp)SOURCE overpower protection threshold voltage on pin SOURCE Vsc/t slope compensation voltage tleb leading edge blanking time pin SOURCE; V/t = 50 mV/s Overpower compensation (VINSENSE and SOURCE pins) Iopc(SOURCE) overpower compensation current on pin SOURCE Soft-start (SOURCE pin) Istart(soft) soft start current Vstart(soft) soft start voltage SSL5001T Product data sheet VCTRL = 4 V; enable voltage All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 14 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC Table 6. Characteristics …continued Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the IC; unless otherwise specified. Symbol Parameter Rstart(soft) Conditions Min Typ Max Unit soft start resistance 12 - - k Isource(DRIVER) source current on VDRIVER = 2 V pin DRIVER - 0.3 0.25 A Isink(DRIVER) sink current on pin DRIVER Driver (DRIVER (pin) VO(DRIVER)max maximum output voltage on pin DRIVER VDRIVER = 2 V 0.25 0.3 - A VDRIVER = 10 V 0.6 0.75 - A VCC > VCC(startup) 9 10.5 12 V 130 140 150 C Temperature protection Tpl(IC) [1] IC protection latching level temperature The clamp voltage on the PROTECT pin is lowered when the IC is in power-down (latched or restart protection). SSL5001T Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 2 — 26 June 2014 © NXP Semiconductors N.V. 2014. All rights reserved. 15 of 22 SSL5001T NXP Semiconductors Compact non-dimmable LED controller IC 12. Application information A LED driver with the SSL5001T is a flyback converter operating in Discontinuous Conduction Mode (DCM) and if required in Continuous Conduction Mode (CCM) (See Figure 9). Capacitor C5 buffers the IC supply voltage, which is powered using resistor R3 at start-up and using the auxiliary winding during normal operation. Sense resistor R9 converts the current through the MOSFET S1 into a voltage on the SOURCE pin. The value of R9 defines the maximum primary peak current on MOSFET S1. Resistor R7 reduces the peak current to capacitor C5. In the example shown in Figure 9, the OTP level is set by Positive Temperature Coefficient (PTC) resistor R4. The VINSENSE pin is used for mains voltage detection and resistors R1 and R2 set the start voltage to about 80 V (AC). Resistor R6 and capacitor C6 define the soft-start time. Resistor R5 prevents the soft-start capacitor C6 from being charged during normal operation caused by negative voltage spikes across the current sense resistor R9. Capacitor C3 reduces noise on the CTRL pin. The approximate output power to the LEDs (DCM mode) can be caluculated with Equation 1: V SOURCE  max  2 1 P LED =   ---  L prim   -----------------------------------  f osc   R9 2 (1) Where: •  is the expected frequency. / —+ & —) 9 %