ncp1536 ON Semiconductor, ncp1536 Datasheet - Page 4

• Manufacturer Part Number: ncp1536
• Description: 3.0 A, Step-down Switching Regulator
• Manufacturer: ON Semiconductor

1. Tested junction temperature range for the NCP1536:
2. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.
3. The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output
4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.
5. Feedback (Pin 4) removed from output and connected to 0 V.
6. Feedback (Pin 4) removed from output and connected to +12 V to force the output transistor “off”.
7. V
ELECTRICAL CHARACTERISTICS
max values T
SYSTEM PARAMETERS (Note 2, Typical Test Circuit)
DEVICE PARAMETERS
Feedback Bias Current (V
Oscillator Frequency (Note 3)
Saturation Voltage (I
Max Duty Cycle (“on”) (Note 5)
Current Limit (Peak Current, Notes 3 and 4)
Output Leakage Current, T
Quiescent Current (Note 6)
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
ON/OFF Pin Logic Input Level (Test Circuit Figure 2)
ON/OFF Pin Input Current (Test Circuit Figure 2)
Feedback Voltage (V
Feedback Voltage (8.0 V ≤ V
Efficiency (V
T
T
T
T
T
T
T
T
T
T
T
Output = 0 V
Output = −1.0 V
T
T
T
T
V
V
ON/OFF Pin = 5.0 V (“off”), T
ON/OFF Pin = 0 V (“on”), T
When the NCP1536 is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section.
voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average dissipation of the IC by
lowering the minimum duty cycle from 5% down to approximately 2%.
T
T
T
T
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
out
out
in
J
J
J
J
= −40 to +125°C
= 25°C
= 25°C
= −40 to +125°C
= 25°C
= 0 to +125°C
= −40 to +125°C
= 25°C
= −40 to +125°C
= 25°C
= −40 to +125°C
= 25°C
= −40 to +125°C
= 25°C
= −40 to +125°C
= 20 V.
= 25°C
= −40 to +125°C
= 25°C
= −40 to +125°C
= 0 V
= Nominal Output Voltage
J
in
is the operating junction temperature range that applies, unless otherwise noted.) (Note 1)
= 12 V, I
out
in
Load
= 3.0 A, Note 4)
= 12 V, I
out
J
= 3.0 A, V
J
Characteristics
= 25°C (Notes 6 and 7)
= 5.0 V)
in
= 25°C
J
≤ 40 V, 0.5 A ≤ I
= 25°C
Load
= 0.5 A, V
out
(Unless otherwise specified, V
= 5.0 V)
out
Load
= 5.0 V, T
≤ 3.0 A, V
http://onsemi.com
J
T
= 25°C)
low
NCP1536
out
= −40°C
= 5.0 V)
4
in
= 12 V, I
Symbol
T
V
I
f
high
V
V
DC
V
I
V
stby
I
osc
I
I
I
CL
I
Load
IH
sat
Q
IL
η
out
out
b
L
IH
IL
= +125°C
= 500 mA. For typical values T
1.193
1.217
1.18
Min
4.2
3.5
2.2
2.4
47
42
94
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
1.23
Typ
1.23
1.5
5.8
0.8
6.0
5.0
1.4
1.2
25
52
98
80
15
77
−
−
−
−
−
−
−
−
−
−
0
J
1.267
= 25°C, for min/
1.243
Max
1.28
100
200
200
400
1.8
2.0
6.9
7.5
2.0
9.0
1.0
0.8
5.0
58
63
20
11
30
−
−
−
−
−
Unit
kHz
mA
mA
mA
mA
nA
%
V
A
V
%
V
V