There are automotive applications for indicators and for LCD local-dimming backlighting. For these applications, more persons think multi-channel constant-current LED drivers are necessary. The requirement is to get the same intensity and color temperature of LEDs. For system-level safety, it is necessary that the LED drivers can sense faults.
The TLC6C5724-Q1 device is an automotive 24-channel constant-current RGB LED driver that can do tests on the LEDs. The TLC6C5724-Q1 device supplies a maximum of 50‑mA output current set by an external resistor. The device has a 7-bit dot correction with two ranges for each output. The device also has an 8-bit intensity control for the outputs of each color group. A 12-,10-, or 8-bit grayscale control adjusts the intensity of each output. The device has circuits that sense faults in the system, including LED faults, adjacent-pin short faults, reference-resistor faults, and more. A slew rate control has 2 positions for adjustment to get the largest decrease in system noise. There is an interval between the changes of output level from one LED group to a different one. This interval helps to decrease the starting electrical current. The SDI and SDO pins let more than one device be connected in series for control through one serial interface.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TLC6C5724-Q1 | HTSSOP (38) | 6.20 mm × 12.50 mm |
Changes from * Revision (December 2017) to A Revision
MIN | MAX | UNIT | ||
---|---|---|---|---|
Input voltage | VCC | –0.3 | 6 | V |
SENSE | –0.3 | 8 | ||
BLANK, GCLK, LATCH, SCK, SDI | –0.3 | VCC + 0.3 | ||
Output voltage | ERR, IREF, SDO | –0.3 | VCC + 0.3 | V |
OUTR0–OUTR7, OUTG0–OUTG7, OUTB0–OUTB7 | –0.3 | 8 | ||
Output current | OUTR0–OUTR7, OUTG0–OUTG7, OUTB0–OUTB7 | 0 | 50 | mA |
Operating junction temperature, TJ | –40 | 150 | °C | |
Storage temperature, Tstg | –55 | 150 | °C |
VALUE | UNIT | ||||
---|---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per AEC Q100-002(1) | ±2000 | V | |
Charged-device model (CDM), per AEC Q100-011 | All pins | ±500 | |||
Corner pins (1, 19, 20, and 38) | ±750 |
MIN | NOM | MAX | UNIT | |||
---|---|---|---|---|---|---|
VCC | Device supply voltage | 3 | 5.5 | V | ||
VSENSE | LED supply voltage | 8 | V | |||
VO | Output voltage | 8 | V | |||
VIL | Input logic-low voltage | BLANK, GCLK, LATCH, SCK, SDI | 0 | 0.3 VCC | V | |
VIH | Input logic-high voltage | BLANK, GCLK, LATCH, SCK, SDI | 0.7 VCC | VCC | V | |
IOH | High-level output source current | SDO | 1 | mA | ||
IOL | Low-level input sink current | SDO | 1 | mA | ||
ERR | 5 | |||||
IO | Constant output sink current | OUTR0–OUTR7, OUTG0–OUTG7, OUTB0–OUTB7 | 2 | 50 | mA | |
TA | Operating ambient temperature | –40 | 125 | °C | ||
TJ | Operating junction temperature | –40 | 150 | °C |
THERMAL METRIC(1) | TLC6C5724-Q1 | UNIT | |
---|---|---|---|
DAP (HTSSOP) | |||
38 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 39.6 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 31.2 | °C/W |
RθJB | Junction-to-board thermal resistance | 18 | °C/W |
ψJT | Junction-to-top characterization parameter | 0.8 | °C/W |
ψJB | Junction-to-board characterization parameter | 18.1 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 2 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
POWER SUPPLIES | ||||||
ICC | Supply current | SDI, SCK, LATCH = L, BLANK = L, GCLK = L, VOUT = 1 V, IOUT = 2 mA | 4.2 | 5.5 | mA | |
SDI, SCK, LATCH = L, BLANK = L, GCLK = L, VOUT = 1 V, IOUT = 20 mA | 7.7 | 9 | ||||
SDI, SCK, LATCH = L, BLANK = H, GCLK = 8 MHz, VOUT = 1 V, IOUT = 20 mA , auto-repeat on | 8.3 | 10 | ||||
SDI, SCK, LATCH = L, BLANK = H, GCLK = 8 MHz, VOUT = 1 V, IOUT = 50 mA , auto-repeat on | 13.5 | 16 | ||||
LOGIC INPUTS (SDI, SCK, LATCH, GCLK, BLANK) | ||||||
IIkg | Input leakage current | At SDI, SCK, LATCH, with VI = VCC; or at SDI, SCK, LATCH, BLANK, GCLK, with VI = GND | –1 | 1 | µA | |
Rpd | Pull down resistance at BLANK, GCLK | 250 | 500 | 750 | kΩ | |
CONTROL OUTPUTS (IREF, ERR, SDO) | ||||||
VIREF | IREF voltage | RIREF = 0.96 kΩ | 1.17 | 1.2 | 1.23 | V |
VOH | High-level output voltage | At SDO, IOH = –1 mA | VCC – 0.4 | VCC | V | |
VOL | Low-level output voltage | At SDO, IOL = 1 mA | 0.4 | V | ||
VERR | ERR pin open-drain voltage drop | IERR = 4 mA | 0.1 VCC | V | ||
ILKG_ERR | ERR pin leakage current | VERR = 5 V | 1 | µA | ||
OUTPUT STAGE | ||||||
V(OUT,min) | Minimum output voltage | VCC = 3.6 V, IOUT = 50 mA | 0.67 | V | ||
VCC = 3 V, IOUT = 50 mA | 0.7 | |||||
K(OUT) | Ratio of output current to IREF current, K = I(OUTx) / I(IREF) | 40 | mA/mA | |||
Ilkg(OUT) | Output leakage current | BLANK = L, VOUT = 7 V, VSENSE = 7 V | 0.1 | µA | ||
CHANNEL ACCURACY | ||||||
I(OUT) | Constant output current | VOUT = 1 V, RIREF = 24 kΩ | 1.86 | 2 | 2.14 | mA |
VOUT = 1 V, RIREF = 0.96 kΩ | 46.5 | 50 | 53.5 | |||
VOUT = 1V, RIREF open or short | 7 | 10 | 13 | |||
ΔI(Ch-Ch)(1) | Current accuracy (channel-to-channel in same color group) | VOUT = 1 V, IOUT = 50 mA | –4% | 4% | ||
VOUT = 1 V, IOUT = 2 mA | –4% | 4% | ||||
ΔI(Dev-Dev)(2) | Current accuracy (device-to-device) | VOUT= 1 V, IOUT = 50 mA | –4% | 4% | ||
VOUT = 1 V, IOUT = 2 mA | -–4% | 4% | ||||
ΔI(Ch-Ideal)(3) | Current accuracy (channel-to-ideal output) | VOUT = 1 V, IOUT = 50 mA | –7% | 7% | ||
VOUT = 1 V, IOUT = 2 mA | –7% | 7% | ||||
ΔI(OUT-VCC)(4) | Line regulation | VOUT = 1 V, VCC = 3 V to 5.5 V, IOUT = 50 mA | –0.7 | 0.7 | %/V | |
VOUT = 1 V, VCC = 3 V to 5.5 V, IOUT = 2 mA | –0.7 | 0.7 | ||||
ΔI(OUT-VOUT(5) | Load regulation | VOUT = 1 V to 3 V, IOUT = 50 mA | –0.7 | 0.7 | %/V | |
VOUT = 1 V to 3 V, IOUT = 2 mA | –0.7 | 0.7 | ||||
PROTECTION CIRCUITS | ||||||
VLOD1 | LED open-circuit detection low threshold | LOD_VOLTAGE = 0b | 0.275 | 0.3 | 0.32 | V |
VLOD2 | LED open-circuit detection high threshold | LOD_VOLTAGE = 1b | 0.48 | 0.5 | 0.52 | V |
VLSD1 | LED short-circuit detection high threshold | LSD_VOLTAGE = 0b | VSENSE – 0.4 | VSENSE – 0.3 | VSENSE – 0.2 | V |
VLSD2 | LED short-circuit detection low threshold | LSD_VOLTAGE= 1b | VSENSE – 0.8 | VSENSE – 0.7 | VSENSE – 0.6 | V |
IIREF_OC | IREF resistor open-circuit detection threshold | VCC = 5 V | 8 | 10 | 12 | µA |
IIREF_OCHYS | IREF resistor open-circuit detection threshold hysteresis | VCC = 5 V | 5 | µA | ||
IIREF_SC | IREF resistor short-circuit-detection threshold | VCC = 5 V | 2 | 2.7 | 3.2 | mA |
IIREF_SCHYS | IREF resistor short-circuit-detection threshold hysteresis | VCC = 5 V | 0.3 | mA | ||
TPTW | Pre-thermal warning flag threshold | Junction temperature | 125 | 135 | 145 | °C |
THYS_PTW | Pre-thermal warning flag hysteresis | Junction temperature | 10 | °C | ||
TSD | Thermal error flag threshold | Junction temperature | 150 | 160 | 170 | °C |
THYS_TEF | Thermal error flag hysteresis | Junction temperature | 10 | °C |
MIN | NOM | MAX | UNIT | |||
---|---|---|---|---|---|---|
fCLK(SCK) | SCK data-shift clock frequency | 4 | MHz | |||
fCLK(GCLK) | GCLK grayscale clock frequency | 8 | MHz | |||
tWH0 | SCK high pulse duration | 60 | ns | |||
tWL0 | SCK low pulse duration | 60 | ns | |||
tWH1 | LATCH high pulse duration | 80 | ns | |||
tWL1 | LATCH low pulse duration | 80 | ns | |||
tWL2 | BLANK pulse duration | 80 | ns | |||
tWH3 | GCLK high pulse duration | 40 | ns | |||
tWL3 | GCLK low pulse duration | 40 | ns | |||
tSU0 | SDI - SCK↑ setup time | 55 | ns | |||
tSU1 | BLANK↑– GCLK↑ setup time | 60 | ns | |||
tSU2 | LATCH↑ – SCK↑ setup time | 200 | ns | |||
tSU3 | LATCH↑for GS data – GCLK↑when display timing reset mode is disabled , setup time | 90 | ns | |||
tSU4 | LATCH↑for GS data – GCLK↑ when display timing reset mode is enabled, setup time | 150 | ns | |||
tH0 | SCK↑– SDI hold time | 55 | ns | |||
tH1 | SCK↑– LATCH↑ hold time | 85 | ns | |||
tH2 | SCK↑– LATCH↓ hold time | 55 | ns | |||
tRI0 | SDI, SCK, LATCH rise time | 50 | ns | |||
tRI1 | GCLK rise time | 30 | ns | |||
tFI0 | SDI, SCK, LATCH fall time | 50 | ns | |||
tFI1 | GCLK fall time | 30 | ns |