TLD1311EL_15 Datasheet, PDF (25/33 Pages) Infineon Technologies AG – 3 Channel High Side Current Source

TLD1311EL
Load Diagnosis
according to Equation (4), and the precondition of Equation (5) has to be fulfilled. The pull-down resistor R_DIS is
calculated according to Equation (6) and Equation (7).
n_N
–
1
≤
⎝⎜⎛_---^I_--^I_--^N_---^__--^S_--^E_---^T_--⁽_--^O_---^L_--^,_-^m_----ⁱ_-ⁿ_--⁾_--^–_---^V-_-^--_-^-_-^-_-^D-_-^-_-^-_-^-I_-^-_-^-SR_-^--_-^-_-^(-_-^-H_-S^-_-^-_-^-_E^,_-^-_-^-m_-^-_T^-_-^-_-(^-_-^a-_-m^-_-^-x_-^-_-^-_i-^-)_n-^--_-)^-+_-^-_-^-_-^-_-^-_-^V-_-^-_-^-_-^--_-^F-_--⎠⎟⎞_----^â‹_---^V_----^D_----^I_-^S_---⁽_--^H_---^,_--^m_---ⁱ_--ⁿ_--⁾_---^â‹_---^R_----^S_--^E_---^T_--⁽_--^m_---ⁱ_-ⁿ_--⁾
V_{DIS(H, max)} ⋅ 4 ⋅ V_{IN_SET(max)}
(4)
V_{-----D---I-S---(--H---,--m---i--n--)---}⋅_---V_{----I-N---_--S---E--T---(-m----i-n--)--}⋅_---R_{----S---E--T---(-m----i-n--) > 1}
(5)
(V_{IN_SET(max)})² ⋅ R_SET(max)
R_DIS(min)
=
--------------------------^V----^D---^I--^S---⁽-^H---^,--^m----^a--^x---⁾-------------------------
I_{IN_SET(OL,min)}
–
V_{-----D----I--S---(--H---,--m----a---x---)---+----}V_-----F-
R_SET(max)
(6)
R_DIS(max)
=
-------------^V----^D---^I--^S---⁽-^H---^,---^m---ⁱ--ⁿ--⁾------------
n_N
–
1
⋅
4
⋅
V_{-----I--N---_--S---E---T---(-m----a--x--)}
R_SET(min)
(7)
V_F represents the voltage drop across the diode between the IN_SET- and the DIS-pin.
Note: If one channel of the device should not be used, the according output needs to be connected to GND, which
leads to a disabling of this output.
Note: In case of a double fault, where the loads of two channels are faulty at the same time, the device operates
as in normal operation. This feature is implemented to avoid any unwanted switch off during significant
supply voltage drops. Please refer to Chapter 9.2.
9.2
Double Fault Conditions
The TLD1311EL has an integrated double fault detection feature. This feature is implemented to detect significant
supply voltage drops. During such supply voltage drops close to the forward voltage of the LEDs the drivers
outputs remain active. In case of load faults on two or more outputs within the time period t_N-1 the device disables
the diagnosis to avoid any uncorrect open load diagnosis during low supply voltages close to the forward voltages
of the connected LED chains. If the faults between two or three channels happen with a delay of longer than t_OL
the double fault detection feature is not active, i.e. the device is not turned on.
9.3
Electrical Characteristics IN_SET Pin and Load Diagnosis
Electrical Characteristics IN_SET pin and Load Diagnosis
Unless otherwise specified: V_S = 5.5 V to 40 V, T_j = -40 °C to +150 °C, R_SET = 12 kΩ, all voltages with respect to
ground, positive current flowing into pin for input pins (I), positive currents flowing out of the I/O and output pins
(O) (unless otherwise specified)
Pos. Parameter
Symbol
Limit Values
Unit Conditions
9.3.1
9.3.2
IN_SET reference
voltage
IN_SET N_1 voltage
V_{IN_SET(ref)}
Min.
1.19
V_{IN_SET(N-1)}
4
Typ.
1.23
–
Max.
1.27 V
5.5
V
1) _{VOUTx = 3.6 V}
T_j = 25...115 °C
1) _{VS > 8 V}
T_j = 25...150 °C
V_S = V_OUTx (OL) _x
Data Sheet
25
Rev. 1.1, 2015-03-19