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IR2155&(PbF)
Absolute Maximum Ratings
Absolute Maximum Ratings indicate sustained limits beyond which damage to the device may occur. All voltage param-
eters are absolute voltages referenced to COM. The Thermal Resistance and Power Dissipation ratings are measured
under board mounted and still air conditions.
Parameter
Value
Symbol
V B
V S
V HO
V LO
V RT
V CT
I CC
I RT
dV s /dt
Definition
High Side Floating Supply Voltage
High Side Floating Supply Offset Voltage
High Side Floating Output Voltage
Low Side Output Voltage
R T Voltage
C T Voltage
Supply Current (Note 1)
R T Output Current
Allowable Offset Supply Voltage Transient
Min.
-0.3
V B - 25
V S - 0.3
-0.3
-0.3
-0.3
—
-5
—
Max.
625
V B + 0.3
V B + 0.3
V CC + 0.3
V CC + 0.3
V CC + 0.3
25
5
50
Units
V
mA
V/ns
P D
R θ JA
T J
T S
T L
Package Power Dissipation @ T A ≤ +25 ° C
Thermal Resistance, Junction to Ambient
Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 seconds)
(8 Lead DIP)
(8 Lead SOIC)
(8 Lead DIP)
(8 Lead SOIC)
—
—
—
—
—
-55
—
1.0
0.625
125
200
150
150
300
W
° C/W
° C
Recommended Operating Conditions
The Input/Output logic timing diagram is shown in Figure 1. For proper operation the device should be used within the
recommended conditions. The V S offset rating is tested with all supplies biased at 15V differential.
Parameter
Value
Symbol
V B
V S
V HO
V LO
I CC
T A
Definition
High Side Floating Supply Absolute Voltage
High Side Floating Supply Offset Voltage
High Side Floating Output Voltage
Low Side Output Voltage
Supply Current (Note 1)
Ambient Temperature
Min.
V S + 10
—
V S
0
—
-40
Max.
V S + 20
600
V B
V CC
5
125
Units
V
mA
° C
Note 1:
2
Because of the IR2155’s application specificity toward off-line supply systems, this IC contains a zener clamp
structure between the chip V CC and COM which has a nominal breakdown voltage of 15.6V. Therefore, the IC
supply voltage is normally derived by forcing current into the supply lead (typically by means of a high value
resistor connected between the chip V CC and the rectified line voltage and a local decoupling capacitor from
V CC to COM) and allowing the internal zener clamp circuit to determine the nominal supply voltage. There-
fore, this circuit should not be driven by a DC, low impedance power source of greater than V CLAMP .
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