TC62D722CFG* Toshiba, TC62D722CFG* Datasheet - Page 23

• Manufacturer Part Number: TC62D722CFG*
• Manufacturer: Toshiba

Specifications of TC62D722CFG*

• Package: SSOP24
• # Outputs: 16
• Vout Max: 17V
• Io: 1.5 to 90mA
• Io Accuracy: ±1.5%
• Features Error Detection: Y
• Features Gain Control: 8-bit
• Features Pwm Dimming: 16-bit
• Other Features & Functions: Available in small QSOP24 package (outside Japan)
• Rohs Compatible Product(s) (#): -

6. Thermal shutdown circuit (TSD)
7. Output delay function
outputs are ON or OFF at the same time.There is a switching timelag between outputs.
A switching timelag between outputs is put in order of the following.
When the temperature of internal IC exceeds 150  C, all constant current outputs are turned off by this
function. The constant current is outputted again when the temperature decreases to the rating.
The thermal shutdown function of this IC aims at stopping the influence (emitting smoke, ignition) on
the circumference (LED and substrate) to the minimum, when it is used on the conditions beyond not a
function but the maximum rating for preventing destruction of IC and IC results in destruction.
This function is intended to have the effect of reducing switching noise by reducing the di/dt when all
Setting method of resistance for heat protection
Calculation of heat
In case used LED supply voltage is high, and heat value of internal IC is large.
OUT →
OUT →
Voltage that should decrease by external resistance V
Resistance for heat protection  = Voltage that should decrease by external resistance V / Output current A
Consumption power (IC supply) W = IC supply voltage V ×IC supply current A
Total of consumption power W = Consumption power (IC output) W + Consumption power (IC supply) W
Heat value of internal IC C = Thermal Resistance C / W × total of power consumption W
Heat value of internal IC can be reduced by decreasing the voltage with the external resistance shown below.
Temperature of internal IC C = Heat value of internal IC C + Ambient temperature C
Consumption power (IC output) W = (LED supply voltage V - Minimum of V
Take care not to let the temperature of the internal IC exceed 150℃ by referring to the formula below.
0
5
OUT
OUT
Controller
15
10
→
→
OUT →
OUT →
7
3
SCK
SIN
TRANS
PWMCLK
OUT →
OUT
REXT
= LED supply voltage V - maximum of V
12
8
→
OUT →
GND
VDD
OUT →
× Output current A × number of output × (ON Duty % / 100 )
1
4
SOUT
23
OUT
OUT15
OUT
OUT0
OUT7
14
11
→
OUT →
6
Resistance for heat protection
OUT →
f
f
of LED V - Output voltage V
TC62D722CFG/CFNG
of LED V )
9
OUT →
2
OUT
2011-09-24
13
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