SSL1750T NXP [NXP Semiconductors], SSL1750T Datasheet
SSL1750T
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SSL1750T Summary of contents
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SSL1750 SMPS control IC for LED drivers Rev. 01 — 15 September 2008 1. General description The SSL1750 is a Switched Mode Power Supply (SMPS) controller IC, suitable for driving LED applications from 250 W. For ...
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NXP Semiconductors I Frequency limitation to reduce switching losses I Burst mode operation if a low load is detected at the flyback output (patented) 2.4 Flyback green features I Valley switching for minimum switching losses (patented) I Frequency reduction with ...
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... NXP Semiconductors 4. Ordering information Table 1. Ordering information Type number Package Name SSL1750T SO16 5. Block diagram 1.12 V 3.5 V LOW VIN 7 VINSENSE LATCH RESET 6 PFCCOMP 9 2.50 V 2.7 V VOSENSE VoOVP VoBURST HIGH VoBURST LOW VoSTART FB VoSHORT OCP BLANK 500 mV 11 PFCSENSE 60 A SOFT START SOFT STOP ...
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... FBCTRL 3 4 FBAUX SSL1750T LATCH 5 PFCCOMP 6 VINSENSE 7 8 PFCAUX Pin configuration for SSL1750T (SOT109-1) Pin description Pin Description 1 supply voltage 2 ground 3 control input for flyback 4 input from auxiliary winding for demagnetization timing and overvoltage protection for flyback 5 general purpose protection input ...
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... AC/DC converter to drive multiple DC/DC LED drivers as shown in Fig 3. Application circuit SSL1750_1 Product data sheet Figure 3. The SSL1750 can also be used as a typical SSL1750T Rev. 01 — 15 September 2008 SSL1750 SMPS control IC for LED drivers Figure 4. + 014aaa561 © NXP B.V. 2008. All rights reserved. ...
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... its output is deactivated and the charge current is switched on again. Rev. 01 — 15 September 2008 SMPS control IC for LED drivers SSL1750T between V and V CC th(UVLO) level. First, the output on pin LATCH is activated voltage and the soft-start capacitor on en(LATCH) capacitor ...
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NXP Semiconductors As soon as the flyback converter is started, the voltage on pin FBCTRL is monitored. If the output voltage of the flyback converter does not reach its intended regulation level in a predefined time, the voltage on pin ...
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NXP Semiconductors VINSENSE PROTECTION PFCSENSE PFCDRIVER FBSENSE FBDRIVER FBCTRL VOSENSE Fig 5. 7.1.2 Supply management All internal reference voltages are derived from a temperature compensated and trimmed on-chip band gap circuit. Internal reference currents are derived from a temperature compensated ...
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NXP Semiconductors 7.1.4 Fast latch reset In a typical application, the mains can be interrupted briefly to reset the latched protection. The PFC bus capacitor, C reset. Typically, the PFC bus capacitor, C level. When the latched protection is set, ...
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NXP Semiconductors For applications with high transformer ringing frequencies (after the secondary stroke), Pin PFCAUX should be connected via a capacitor and a resistor to the auxiliary winding. A diode must then be placed from the ground connection to pin ...
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NXP Semiconductors Fig 6. 7.2.6 Burst mode control When the output power of the flyback converter (see converter switches over to frequency reduction mode. When frequency reduction mode is entered by the flyback controller, the power factor correction circuit switches ...
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NXP Semiconductors Fig 7. 7.2.7 Overcurrent protection (pin PFCSENSE) The maximum peak current is limited cycle-by-cycle by sensing the voltage across an external sense resistor (R measured via the pin PFCSENSE. 7.2.8 Mains undervoltage lockout / brownout protection (pin VINSENSE) ...
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NXP Semiconductors 7.2.11 Driver (pin PFCDRIVER) The driver circuit to the gate of the power MOSFET has a current sourcing capability of typically 500 mA and a current sink capability of typically 1.2 A. This permits fast turn-on and turn-off ...
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NXP Semiconductors In frequency reduction mode the PFC controller is switched to burst mode operation and the flyback maximum frequency changes linearly with the control voltage on pin FBCTRL (see Figure 50 mV (typ) hysteresis load operation the ...
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NXP Semiconductors (1) Start of new cycle at lowest drain voltage. (2) Start of new cycle in a classical Pulse Width Modulation (PWM) system without valley detection. Fig 10. Signals for valley switching 7.3.3 Current mode control (pin FBSENSE) Current ...
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NXP Semiconductors Fig 11. Frequency control of flyback part The driver output is latched in the logic, preventing multiple switch-on. 7.3.4 Demagnetization (pin FBAUX) The system is always in quasi-resonant or discontinuous conduction mode. The internal oscillator does not start ...
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NXP Semiconductors a. Circuit diagram b. Timing diagram Fig 12. Time-out protection 7.3.6 Soft start-up (pin FBSENSE) To prevent audible transformer noise during start-up, the transformer peak current, I slowly increased by the soft-start function. This can be achieved by ...
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NXP Semiconductors Fig 13. Soft start-up of flyback 7.3.7 Maximum on-time The flyback controller limits the ‘on-time’ of the external MOSFET (typ). When the ‘on-time’ is longer than 25 s, the IC stops switching and enters the ...
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NXP Semiconductors 7.3.9 Overcurrent protection (pin FBSENSE) The primary peak current in the transformer is measured accurately cycle-by-cycle using the external sense resistor internal level (see also leading edge blanking period, t Fig 14. OCP leading edge ...
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NXP Semiconductors Table 3. In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol I FBSENSE I FBDRIVER I PFCDRIVER I HV General P tot T stg T j ESD V ESD [1] Equivalent to discharging a 100 pF ...
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NXP Semiconductors Table 5. Characteristics …continued Measurement data valid amb positive when flowing into the IC; unless otherwise specified. Symbol Parameter Supply voltage management (pin V V trip voltage trip V start-up voltage startup ...
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NXP Semiconductors Table 5. Characteristics …continued Measurement data valid amb positive when flowing into the IC; unless otherwise specified. Symbol Parameter Pulse width modulator PFC t PFC on-time on(PFC) Output voltage sensing PFC (pin ...
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NXP Semiconductors Table 5. Characteristics …continued Measurement data valid amb positive when flowing into the IC; unless otherwise specified. Symbol Parameter Demagnetization management PFC (pin PFCAUX) V comparator threshold th(comp)PFCAUX voltage on pin PFCAUX ...
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NXP Semiconductors Table 5. Characteristics …continued Measurement data valid amb positive when flowing into the IC; unless otherwise specified. Symbol Parameter Peak current control flyback (pin FBCTRL) V voltage on pin FBCTRL FBCTRL V ...
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NXP Semiconductors Table 5. Characteristics …continued Measurement data valid amb positive when flowing into the IC; unless otherwise specified. Symbol Parameter Temperature protection T IC protection level pl(IC) temperature T hysteresis of IC protection ...
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NXP Semiconductors 11. Package outline SO16: plastic small outline package; 16 leads; body width 3 pin 1 index 1 DIMENSIONS (inch dimensions are derived from the original mm dimensions) A UNIT ...
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NXP Semiconductors 12. Revision history Table 6. Revision history Document ID Release date SSL1750_1 20080915 SSL1750_1 Product data sheet Data sheet status Change notice Product data sheet - Rev. 01 — 15 September 2008 SSL1750 SMPS control IC for LED ...
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NXP Semiconductors 13. Legal information 13.1 Data sheet status [1][2] Document status Product status Objective [short] data sheet Development Preliminary [short] data sheet Qualification Product [short] data sheet Production [1] Please consult the most recently issued document before initiating or ...
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NXP Semiconductors 15. Contents 1 General description . . . . . . . . . . . . . . . . . . . . . . 1 2 Features . . . . . . . . ...