WT78LXX
WT78L18 (Refer to the test circuits, Tj=0~125°C, I =40mA, V =27V, C =0.33µF, C =0.1µF unless otherwise specified)
O
in
in
O
Parameter
Symbol
Min
Typ
Max
Unit
Output Voltage
V =27V, I =40mA, T =25°C
A-Rank(3%)
in
O
j
17.46
17.10
18.0
-
18.54
18.90
V
V
O
21V ≤ V ≤ 33V, 1mA ≤ I ≤ 40mA
in
O
B-Rank(5%)
21V≤ V ≤V , 1mA≤ I ≤70mA (Note2)
in
max
O
Line Regulation
21V ≤ V ≤ 33V, I =40mA, T =25°C
-
-
145
135
300
250
in
O
j
∆V
mV
O
22V ≤ V ≤ 33V, I =40mA, T =25°C
in
O
j
Load Regulation
in
V = 27V, 1mA ≤ I ≤ 40mA, T =25°C
in
-
-
30
15
170
85
V = 27V, 1mA ≤ I ≤ 100mA, T =25°C
O
j
∆V
mV
mA
O
O
j
Quiescent Current
V = 27V, I =0mA, T =25°C
I
-
2.0
6.0
Q
in
O
j
Quiescent Current Change
V = 27V, 1mA ≤ I ≤ 40mA
in
O
∆I
-
-
-
-
0.1
1.5
Q
mA
µV
dB
21V ≤ V ≤ 33V, I =40mA
in
O
Output Noise Voltage
10Hz ≤ f ≤ 100KHz
V
n
-
150
48
-
-
Ripple Rejection
RR
34
23V ≤ V ≤ 33V, f=120Hz, T =25°C
in
j
Dropout Voltage
V
-
-
1.7
-
-
V
D
I = 100mA, T =25°C
O
j
Temperature Coefficient of Output Voltage
I = 5mA, 0°C ≤ T ≤ 125°C
∆V / ∆T
-1.8
mV/°C
O
j
O
j
WT78L24 (Refer to the test circuits, Tj=0~125°C, I =40mA, V =33V, C =0.33µF, C =0.1µF unless otherwise specified)
O
in
in
O
Parameter
Symbol
Min
Typ
Max
Unit
Output Voltage
V =33V, I =40mA, T =25°C
A-Rank(3%)
in
O
j
23.28
22.80
24.0
-
24.72
25.20
V
V
O
27V ≤ V ≤ 38V, 1mA ≤ I ≤ 40mA
in
O
B-Rank(5%)
27V≤ V ≤V , 1mA≤ I ≤70mA (Note2)
in
max
O
Line Regulation
27V ≤ V ≤ 38V, I =40mA, T =25°C
-
-
160
150
300
250
in
O
j
∆V
mV
O
28V ≤ V ≤ 38V, I =40mA, T =25°C
in
O
j
Load Regulation
in
V = 33V, 1mA ≤ I ≤ 40mA, T =25°C
in
-
-
40
20
200
100
V = 33V, 1mA ≤ I ≤ 100mA, T =25°C
O
j
∆V
mV
mA
O
O
j
Quiescent Current
V = 33V, I =0mA, T =25°C
I
-
2.2
6.0
Q
in
O
j
Quiescent Current Change
V = 33V, 1mA ≤ I ≤ 40mA
in
O
∆I
-
-
-
-
0.1
1.5
Q
mA
µV
dB
27V ≤ V ≤ 38V, I =40mA
in
O
Output Noise Voltage
10Hz ≤ f ≤ 100KHz
V
n
-
200
45
-
-
Ripple Rejection
RR
34
27V ≤ V ≤ 38V, f=120Hz, T =25°C
in
j
Dropout Voltage
V
-
-
1.7
-
-
V
D
I = 100mA, T =25°C
O
j
Temperature Coefficient of Output Voltage
I = 5mA, 0°C ≤ T ≤ 125°C
∆V / ∆T
-2.0
mV/°C
O
j
O
j
Note1: The Maximum steady state usable output current is dependent on input voltage, heat sinking, lead length of the package and
copper of PCB .The data above represent pulse test conditions with junction temperatures specified at the initiation of test.
Note2: Power dissipation<0.75W
WEITRON
http://www.weitron.com.tw
23-Mar-07
7/10
