tb62719af TOSHIBA Semiconductor CORPORATION, tb62719af Datasheet - Page 24

• Manufacturer Part Number: tb62719af
• Description: 16ch Constant Current Drivers And Controller For Full-color Led Modules And Panels
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Perform two-stage temperature detection as described in the table below (TSD1/TSD2).
Reform output-open detection as described in the table below.
Temperature detection function
Output-Open Detection Function
Pulse Cancellation Circuit
(when monitored using output-open detection pin ARARM2.)
Temperature
− 40 to 120
Junction
120 to
140 to
Output Voltage
°C
> = V
< = V
Input signal
PWMCLK
No input
V (typ.)
DD
DD
× 0.04
× 0.04
(high impedance)
(low level)
(low level)
ALARM1
OFF
ON
ON
Always high impedance
(high impedance)
(low level)
Operating
ALARM2
ALARM2
OFF
ON
Output Terminals
Normal operation
Normal operation
(high impedance)
(can be monitored via the ALARM1 pin.)
Forced OFF
OUT (15:0)
(can be monitored via the ALARM2 pin.)
The output-open condition is detected when the ARARM2 pin signal is ON
and the specified voltage level is detected. (it is also detected when the
output voltage falls to near GND for some reason)
Output open detection operates when the LED string is disconnected for the
specified period.
The device incorporates pulse cancel circuit to avoid detecting
instantaneous errors, for example, output switching noise.
However, if there is no input on PWMCLK, ALARM2 output will not be
turned ON (low level).
24
When the chip temperature reaches the specified range the
ALARM1 signal goes Low (TSD1), Other functions are not
affected.
When the chip temperature reaches the specified range the
ALARM1 signal goes Low and all output pins are turned OFF
(TSD2).
Outputs are re-enabled on the TSENA signal goes Low or
when the RESET signal goes Low. Neither of these causes
the internal data to be reset.
If RESET pin = L, all internal data is reset.
Function
Function
⎯
Function
⎯
TB62719AF
2004-05-12