TLE4678_15 Datasheet, PDF (27/37 Pages) Infineon Technologies AG – Low Drop Out Linear Voltage Regulator

TLE4678
Watchdog Function
8.2
Electrical Characteristics Watchdog Function
Electrical Characteristics Watchdog Function
V_I = 13.5 V, T_j = -40 °C to +150 °C,
all voltages with respect to ground, direction of currents as shown in Figure 9 (unless otherwise specified).
Parameter
Symbol
Limit Values
Unit Conditions
Number
Min. Typ. Max.
Default Watchdog Activating Threshold (pin WADJ left open)
Watchdog Activating
Threshold
I_Q,WDact,th 0.65 1.1
1.5
mA
Watchdog Deactivating
Threshold
Watchdog Activating
Threshold Hysteresis
I_Q,WDdeact,t 0.55 0.9
–
mA
h
I_Q,WDact,hy 50
200 –
µA
I_Q increasing
I_Q decreasing
–
8.2.1
8.2.2
8.2.3
Adjustable Watchdog Activating Threshold (external resistor connected to pin WADJ)
Activating Threshold
Current ratio
Internal Watchdog Adjust
Resistor
V_WADJ,th –
I_Q / I_WADJ –
R_WADJ,int 96
693 –
mV –
208 –
–
131 ¹⁷⁵ kΩ
V_WADJ = 0V
–
Activating Threshold Factor F_WDact,th 127 144 ¹⁶² mA Calculated value ¹⁾
× kΩ
Deactivating Threshold Factor F_WDdeact,t 104 118 –
h
Activating Threshold
F_WDact,hy 7
Switching Hysteresis Factor
26 –
mA Calculated value ¹⁾
× kΩ
mA Calculated value ¹⁾
× kΩ
8.2.4
8.2.5
8.2.6
8.2.7
8.2.8
8.2.9
Watchdog Input WI
Watchdog Input
Low Signal Valid
Watchdog Input
High Signal Valid
Watchdog Input
High Signal Pulse Length
Watchdog Input Signal
Slew Rate
Watchdog Input Signal
Frequency Capture Range
V_WI,lo
–
–
V_WI,hi
2.6 –
t_WI,p
0.5 –
dV_WI/dt 1
–
f_WI
–
–
0.8 V
– ²⁾
8.2.10
–
V
– ²⁾
8.2.11
–
µs
V_WI ≥ V_WI,high ²⁾
8.2.12
–
V/µs V_WI,low ≤ V_WI ≤ V_WI,high ^{2) 8.2.13}
1
MHz Square Wave,
8.2.14
50% Duty Cycle ²⁾
Datasheet
27
Rev. 1.2, 2014-10-17