TLD5095EL Datasheet, PDF (20/31 Pages) Infineon Technologies AG – DC/DC Boost, Buck-Boost, SEPIC controller

TLD5095EL
Protection and Diagnostic Functions
TLD5095
Overvoltage
Compartor
R_OVH
OVFB
9
V_OVFB,TH
R_OVL
Feedback Voltage
Error Amplifier
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
V_FBx < V_FBx,min = 4.5V
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
example: V_OUT,max=40V
1.25mA
TLD5095
R_OVH
OVFB ⁹
40V
1.25mA
≅
33.2kΩ
GND
12
R_{OVL 1kΩ 1.25V}
V_OVFB
V_OVP,max
Overvoltage Protection
ACTIVE
V_OVFB,TH
1.25V
Overvoltage Protection is
disabled
t
Figure 12 Overvoltage Protection description
Datasheet
20
Rev. 1.1, 2009-12-16