TLD5098EL Datasheet, PDF (22/39 Pages) Infineon Technologies AG – DC/DC Boost, Buck-Boost, SEPIC controller

TLD5098EL
Protection and Diagnostic Functions
Input
Condition
Overvoltage @
Output
Open Load
Short to GND @ LED
chain
Open Feedback
Overtemperature
Undervoltage @
Input
Level *
False
True
False
True
False
True
False
True
False
True
False
True
*Note:
Sw = Switching
False = Condition does not exist
True = Condition does exist
Figure 10 Diagnosis Truth Table
SWO
Sw*
L
Sw*
L
Sw*
L
Sw*
L
Sw*
L
Sw*
L
Output
PWMO
H or Sw *
L
H or Sw *
L
H or Sw *
L
H or Sw *
L
H or Sw *
L
H or Sw *
L
IVCC
Active
Active
Active
Active
Active
Active
Active
Active
Active
Shutdown
Active
Shutdown
Overvoltage
Compartor
Feedback Voltage
Error Amplifier
R_OVH
OVFB
9
V_OVFB,TH
R_OVL
FBH
6
FBL
7
+
V_REF
-
PWMO
5
V_BO
Open Circuit 3
Open Circuit 1
R_FB
Open Circuit 2
D₁
D₂
D₃
D₄
D₅
D₆
D₇
D₈
D₉
D₁₀
Open Circuit 4
T_DIM
Output Open Circuit Conditions
Open Circuit
Condition
1
Fault Condition
Open FBH
2
Open FBL
3
Open VBO
4
Open PWMO
Fault Threshold Voltage
V_REF
-20 to -100 mV
0.5 to 1.0 V
-20 to -100 mV
Detected by overvoltage
V_REF
Max Threshold = 1.0 V
Min Threshold = 0.5 V
Typical V _REF = 0.3 V
Max Threshold = -20 mV
Min Threshold = -100 mV
Figure 11 Open Load and Open Feedback Conditions
Datasheet
22
Rev. 1.0, 2010-10-13