CAT4106HV4-GT2 ONSEMI | Alldatasheet
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Technical content
Characteristics subject to change without notice 6W Quad Channel DC/DC LED Driver with Diagnostics
FEATURES
Four LED Channels with tight current matching Integrated DC/DC Boost converter Up to 6 W LED Total Output Power Up to 92% Efficiency Low Dropout LED Channels (500 mV at 175 mA) High Frequency PWM interface (up to 2 kHz) Adjustable Short/Open LED Detection Programmable LED Channel current Adjustable LED Channel voltage Thermal shutdown protection RoHS-compliant 16-lead TQFN 4 x 4 mm and TSSOP packages
APPLICATIONS
LCD Backlight Lighting Automotive and General Purpose Lighting
ORDERING INFORMATION
CAT4106HV4-GT2 TQFN-16 (1) 2,000 CDAL CAT4106YP-T2 TSSOP-16 (2) 2,000 4106Y Notes: (1) NiPdAu Plated Finish (RoHS-compliant) (2) Matte-Tin Plated Finish (RoHS-compliant). PIN CONFIGURATION TSSOP 16-Lead (Top View) LED1 GND FAULT PGND VFMAX VFMIN CTRL VIN LED2 LED3 LED4 RSET FB SW EN/PWM NC TAB is GND TQFN 16-Lead (Top View)
DESCRIPTION
The CAT4106 is an integrated multi-channel LED driver and high power DC/DC converter suitable for powering backlighting applications up to a total of 6 watts. Up to four matched LED strings can be accurately programmed with uniform drive current set by a single external resistor. Each output channel is suitable for LED string voltages of up to 36 V. The driver automatically adjusts the output voltage to drive the highest forward volta ge string with the minimum headroom voltage maximizing the efficiency. High resolution dimming control is achieved by the EN/PWM logic pin which supports multiple frequencies. This ensures precise PWM dimming control while the device remains fully biased. In addition, when held at logic low, the device to enter a full shutdown “zero” current mode. External programming resistors set the minimum and maximum voltage limits for the acceptable “window of operation” for LED strings. Any channel which fails to regulate within the window (Open or Short LED) is detected and flagged on the FAULT logic output (active low, open-drain). The device is available in a 16-lead TQFN 4 mm x 4 mm and TSSOP with exposed pad packages. For Ordering Information details, see page 16. TYPICAL APPLICATION CIRCUIT GND VIN VIN 3 V to 5.5 V
3 V to 24 V
1 µF SW PGNDFB CTRL R5 R7 LED Fault Detection (open drain pull-down) R4 R6 R2 20 k Ω 20 kΩ 4.7µF L 47 µH D 10 µF/50 V FAULT 13141516 8765 LED2 LED3 LED4 RSET FB SW EN/PW NC LED1 GND TAB is GNDFAULT PGND VFMAX VFMIN CTRL VIN
Typical application circuit with external components is shown on page 1. For 3.0 ≤ VIN ≤ 5.5V, over full ambient temperature range -40 to +85ºC. Figure 3. CAT4106 EN/PWM Timing specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
Characteristics subject to change without notice ELECTRICAL OPERATING CHARACTERISTICS VIN = 5 V, VL (inductor drive voltage) = 12 V, TAMB = 25°C (over recommended operating conditions unless specified otherwise) Symbol Description Conditions Min Typ Max Units IQ VIN Operating Current Switching (I LED = 30 mA) Not Switching (ILED = 30 mA) Switching (I LED = 60 mA) Not Switching (ILED = 60 mA) 2.5 2.0 3.4 2.9 3.5 3.0 4.4 3.9 mA ISD VIN input shutdown Current V EN = 0V 1 µA VIH VIL REN EN/PWM Logic High Threshold Logic Low Threshold Internal Pull-Down Resistor Device Enable Level Disable/PWM Level 0.4 100 0.8 0.7 200 1.3 300 V V kΩ VUVLO Undervoltage lockout (UVLO) VIN pin voltage 2.0 V TSD Thermal Shutdown Threshold 150 °C THYS Thermal Hysteresis 20 °C VRSET RSET regulation voltage 10 μA < IRSET < 2 mA. 1.17 1.20 1.23 V ILED/IRSET RSET to LED Current gain ratio 30 mA LED current 100 VDO LED Channel Dropout Voltage I LED = 175 mA 0.5 V ΔILED LED Channel Matching 0.5 V < V LED < 5 V -5 ±1 +5 % ILED-OFF LED Channel leakage Channel is Off 1 µA VVFMAX O/C Detect voltage threshold 1.15 1.20 1.25 V VVFMIN S/C Detect voltage threshold 1.15 1.20 1.25 V VCTRL ICTRL CTRL pin voltage accuracy CTRL pin maximum load Offset to Lowest LED output - 0.1 + 0.1 V µA Pull-down Drive Current Open Drain Leakage Current FAULT¯¯¯¯¯¯ is Active (0.1 V bias) mA µA VFB IFB FB Pin control voltage FB pin input leakage current Normal switching mode regulation 285 300 315 mV µA FSW ISWMAX RSW DCMAX DCMIN ISWLEAK OVPSW SW Pin Switching Frequency Switch Pin Current Limit Switch Pin On-resistance Maximum Duty Cycle Minimum Duty Cycle Switch Leakage Current Over Voltage Protection Detect I SW = 500 mA Prior to Current Limiting Prior to Pulse-Skipping VSW = 20 V Enters Low Power mode 0.7 0.8 1.0 1.0 1.0 1.3 MHz A Ω µA V
Characteristics subject to change without notice TYPICAL ELECTRICAL OPERATING CHARACTERISTICS VIN = 5 V, VL = 12 V, TAMB = 25ºC, typical application circuit unless otherwise specified. Quiescent Current vs. RSET Current RSET CURRENT [mA] QUIESCENT CURRENT [mA] switching not switching RSET Voltage vs. VIN Supply 1.10 1.15 1.20 1.25 1.30 VIN SUPPLY [V] RSET VOLTAGE [V] RSET Voltage vs. Temperature 1.10 1.15 1.20 1.25 1.30 -50 0 50 100 150 TEMPERATURE [ºC] RSET VOLTAGE [V] ILED/IRSET Gain vs. LED Current 100 120 140 20 60 100 140 180 LED CURRENT [mA] GAIN LED Channel Current vs. LED Pin Voltage 100 125 150 175 200 LED PIN VOLTAGE [V] LED CURRENT [mA] LED Channel Current vs. VIN Supply 100 125 150 175 200 VIN SUPPLY [V] LED CURRENT [mA]
Characteristics subject to change without notice TYPICAL ELECTRICAL OPERATING CHARACTERISTICS VIN = 5 V, VL = 12 V, TAMB = 25ºC, typical application circuit unless otherwise specified. LED Channel Voltage vs. VIN Supply 0.4 0.5 0.6 0.7 0.8 0.9 VIN SUPPLY [V] LED PIN VOLTAGE [V] R2 = R3 = 24kΩ FAULT Drive RDSON vs. VIN Supply VIN SUPPLY [V] FAULT DRIVE RDSON [Ω] Switch Resistance vs. VIN Supply 0.0 0.5 1.0 1.5 2.0 VIN SUPPLY [V] SWITCH RESISTANCE [ Ω] Switching Frequency vs. VIN Supply 0.8 0.9 1.0 1.1 1.2 VIN SUPPLY [V] SWITCHING FREQUENCY [MHz] Switching Current Limit vs. VIN Supply 600 700 800 900 1000 1100 1200 VIN SUPPLY[V] SW CURRENT LIMIT [mA] Powerdown Delay vs. VIN Supply VIN SUPPLY [V] POWERDOWN DELAY [ms]
Characteristics subject to change without notice TYPICAL ELECTRICAL OPERATING CHARACTERISTICS VIN = 5 V, VL = 12 V, TAMB = 25ºC, typical application circuit unless otherwise specified. EN/PWM Threshold vs. VIN Supply 0.70 0.75 0.80 0.85 0.90 0.95 1.00 VIN SUPPLY [V] EN/PWM THRESHOLD [V] VHI VLO PWM Duty Cycle vs. LED Current 100 11 0 1 0 0 DUTY CYCLE [%] TOTAL LED CURRENT [%] 100Hz 1kHz PWM Dimming 100 Hz PWM Dimming 1 kHz Power-Up 4 x 10 LEDs, 50 mA per Channel Maximum LED Current vs. VL Supply 100 150 200 2 4 6 8 10 12 14 16 VL [V] MAX ILED PER CHANNEL [mA] VOUT = 20V 25V 30V
Characteristics subject to change without notice TYPICAL ELECTRICAL OPERATING CHARACTERISTICS VIN = 5 V, VL = 12 V, 20mA per c hannel (80mA total output current), T AMB = 25ºC, typical application circuit unless otherwise specified. Efficiency vs. VIN (VIN = VL) 100 INPUT VOLTAGE [V] EFFICIENCY [%] VOUT = 19V Efficiency vs. VL (VIN = 5V) 100 81 0 1 2 1 4 1 6 INDUCTOR VOLTAGE [V] EFFICIENCY [%] VOUT = 24V Efficiency vs. Output Current (9-LED string) 100 40 80 120 160 200 240 OUTPUT CURRENT [mA] EFFICIENCY [%]
Characteristics subject to change without notice PIN DESCRIPTION Name TQFN-16 TSSOP-16 Function LED1 1 LED1 cathode terminal GND 2 Signal Ground reference FAULT¯¯¯¯¯¯ 3 Open/Short LED Fault detection output (active-low) PGND 4 Power Ground Reference (DC/DC Power Switch) FB 5 Feedback reference (300 mV) fo r setting LED channel operating voltage SW 6 Internal power FET switch drain connection EN/PWM 7 Device Enable (active high) and PWM control input N.C 8 Not connected VIN 9 Supply voltage for the device CTRL 10 LED channel operating voltage (lowest of all 4 channels) VFMIN 11 Comparator input for setting t he LED string short-circuit voltage limit VFMAX 12 Comparator input for setting t he LED string open-circuit voltage limit RSET 13 RSET resistor pin for setti ng the LED channel operating current LED3 14 LED3 cathode terminal LED3 15 LED3 cathode terminal LED4 16 LED4 cathode terminal TAB TAB Thermal pad (connect to GND and PGND) PIN DESCRIPTIONS VIN is the supply pin for the device. The supply input current needed for normal operation is approximately 2 mA plus 3 times IRSET pin current. During intervals of PWM dimming, or whenever the converter is not switching, the supply curr ent will decrease by around 1 mA. The voltage applied at VIN should be kept between 3 V and 5.5 V. A small ceramic bypass capacitor of 0.1 μF or greater is recommended to be in close proximity to the VIN pin. EN/PWM is the device Enable and PWM dimming control input for all LED channels. Guaranteed levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. During normal PWM dimming, the entire device remains fully biased and only the LED channels are pulsed on/off. The device will only enter zero current shutdown mode after the EN/PWM is help low for at least 5 ms typically. This pin has an internal pull-down resistor of 200 kΩ. RSET is the voltage regulated control pin for sensing the desired programming current level to be applied on all LED channels. During normal operation, the RSET pin is kept at 1.2 V and accurately monitors the current level in the externa lly applied R1 resistor. The current transfer ratio from RSET pin current to LED pin current is 100. LED1 to LED4 provide the regulated current source for driving each of the LED strings with a tightly matched constant current. To ensure optimal performance, the bias voltage on the LED channels should be set at a nominal 0.6 V or higher. Each channel is capable of driving a current up to 175 mA. All channels immediately enter a high impedance mode whenever the EN/PWM is taken LOW. CTRL pin is a multiplexer output which selects the lowest operating voltage appea ring on any of the four LED output drive channels. This control signal represents the cathode terminal voltage of the LED string with greatest forward voltage (V F). An external resistor network from CTRL to FB can be used to set the lowest operating voltage of each channel. External current loading of the CTRL pin is recommended to be less than 25 μA. FB is the voltage feedback control pin for the internal high power DC/DC converter. This pin has a high impedance input and its voltage remains accurately regulated to 0.3 V during normal steady state operation
Characteristics subject to change without notice SW pin is the drain terminal of the high voltage CMOS power switch which has a typical on-resistance of 1 Ω and is current limited to 1 A typically. An overvoltage protection circuit places the device in a soft-clamping low power mode if the voltage transients exceed 40 V. VFMIN pin uses a pair of external resistors (R6 & R7) to program the worst case, minimum LED string forward voltage (V FMIN) expected in the specific application. If, during power-up, any LED string enters full regulation before this programmed level is reached (VFMIN pin voltage < 1.2 V), the string will be considered to contain LEDs which are short-circuit and a fault condition will be flagged. The VFMIN input circuitry consists of a comparator referenced to 1.2 V. A typical value for resistor R7 is around 20 kΩ. R6 can be calculated as follows: ⎛ −×= 1V2.1 V7R6R FMIN If this detection feature is not needed, the VFMIN pin must be tied to ground. VFMAX pin uses a pair of external resistors (R4 & R5) to program the worst case, maximum LED string forward voltage (V FMAX) expected in the specific application. If any LED string fails to become regulated before the programmed voltage is reached, the string will be considered to contain LEDs which are open-circuit and a fault condition will be flagged. When an open-circuit is flagged, the individual channel that causes the open-circuit is internally flagged and subsequently ignored. In the event that all channels are detected as being Open-LED, the Output Voltage (top LED Anode) will stabilize at the VFMAX programmed voltage. The VFMAX input circuitry consists of a comparator referenced to 1.2 V. A typical value for resistor R5 is 20 k Ω. R4 can be calculated as follows: ⎛ −×= 1V2.1 V5R4R FMAX If this detection feature is not needed, the VFMAX pin must be tied to ground. FAULT¯¯¯¯¯¯ is an open-drain, active-low, logic signal which becomes active during an LED short-circuit or open- circuit condition. The pin must be connected to a pull- up resistor of around 100 k Ω tied to VIN. The drive pull-down resistance (when active) is typically less than 100 Ω. The diagnostic sequence used to determine a fault condition is initiated when the device is first enabled. PGND pin is the source connection terminal of the high voltage CMOS power switch in the DC/DC converter. The inductor supply bypass capacitor should be connected in close proximity to the PGND pin. The return current from PGND should be connected to the PCB ground plane. GND is the ground reference pin for the device. All analog control voltages are referenced to this pin. In addition, all LED drive currents are conducted through the GND pin. TAB is the thermal pad connection of the package and should be connected to PCB ground plane.
Figure 4. CAT4106 Simplified Functional Block Diagram bias current on all LED strings. can be delivered when powered from a 12 V supply. Table 1. Resistor R1 and LED current
Characteristics subject to change without notice
APPLICATION INFORMATION
External Component Selection Capacitors The CAT4106 requires small ceramic capacitors of 1 µF on the VIN pin (C1), 4.7 μF on the inductor input (C2), and 10 µF on the output (C3). Under normal condition, a 4.7 µF input capacitor (C2) is sufficient. The voltage rating of each capacitor should be compatible with the maximum voltage applied. For the output, a 50 V rated capacitor (C3) is recommended in case the LED becomes disconnected (Open-LED condition). X5R and X7R capacitor types are ideal due to their stability across temperature range. Inductor A 47 µH inductor is recommended for most applications. In cases where the efficiency is critical, inductances with lower series resistance are preferred. Inductors with current rating of 1 A or higher are recommended for most applications. Coilcraft CR73-470 inductor rated at 1.08 A is recommended for most applications. Schottky Diode The current rating of the Schottky diode (D) must exceed the peak current flowing through it. A 1A rated Schottky diode is recommended. The Schottky diode performance is rated in terms of its forward voltage at a given current. In order to ac hieve the best efficiency, this forward voltage should be as low as possible. The response time is also critical since the driver is operating at 1 MHz. NXP PMEG6010CEJ (60 V / 1 A rated) Schottky barrier rectifier is recommended for most applications. Recommended Layout The board layout should provide good thermal dissipation through the PCB. Multiple via can be used to connect the tab of the CAT4106 to a large ground plane underneath the package. Input capacitor C1 should be placed as close to the driver IC as possible. The RSET resistor (R1) and channel voltage setting resi stor (R3) should have a Kelvin connection to the GND pin of the CAT4106. Figure 9. Recommended Layout for TQFN-16
Characteristics subject to change without notice PACKAGE OUTLINE DRAWINGS TQFN 16-Pad 4 x 4 mm (HV4) (1) (2) Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-220 For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. eb L A SIDE VIEWTOP VIEW BOTTOM VIEW E D PIN#1 INDEX AREA PIN#1 ID DETAIL A DETAIL A FRONT VIEW A SYMBOL MIN NOM MAX A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A3 0.20 REF b 0.25 0.30 0.35 D 3.90 4.00 4.10 D2 2.00 – 2.25 E 3.90 4.00 4.10 E2 2.00 – 2.25 e 0.65 BSC L 0.45 – 0.65
Characteristics subject to change without notice TSSOP 16-Lead Exposed Thermal Pad 4.4 mm (YP) (1) (2) Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-153 variations ABT For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Y ± 0.076 D TOP VIEW BOTTOM VIEWEND VIEW SIDE VIEW e eNS PR E1 E Y Xb A PIN#1 IDENTIFICATION EXPOSED THERMAL PAD ZONE LAND PATTERN X ± 0.076 c L SYMBOL MIN NOM MAX A1 . 1 0 A1 0.05 0.15 A2 0.85 0.95 b 0.19 0.30 c 0.13 0.20 D 4.90 5.10 E 6.30 6.50 E1 4.30 4.50 e 0.65 BSC L1 . 0 0 R E F L1 0.45 0.75 N 0.90 1.00 P 6.50 6.70 R 4.60 4.80 S 0.37 0.47 θ10 ° 8 ° X2 . 7 4 R E F Y2 . 7 4 R E F
Characteristics subject to change without notice EXAMPLE OF ORDERING INFORMATION(1) Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard plated finish is NiPdAu. (3) TSSOP only available in Matte-Tin plated finish. (4) The device used in the above exam ple is a CAT4106HV4-GT2 (TQFN , NiPdAu, Tape & Reel, 2,000/Reel). (5) For additional temperature options, please cont act your nearest ON Semiconductor Sales office. Prefix Device # Suffix CAT 4106 HV4 - G T2 Company ID Package HV4: TQFN 16-Pad YP: TSSOP 16-Lead (3) Exposed Thermal Pad Product Number 4106 Tape & Reel T: Tape & Reel 2: 2,000/Reel Lead Finish G: NiPdAu Blank: Matte-Tin For Product Top Mark Codes, click here: http://www.catsemi.com/techsupport/producttopmark.asp
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