National Semiconductor LM1575 Series, Руководство пользователя

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LM1575-ADJ, LM2575-ADJ, LM2575HV-ADJ
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with boldface type apply over full Operating Temperature
Range .
Symbol Parameter Conditions Typ LM1575-ADJ LM2575-ADJ Units
(Limits)
LM2575HV-ADJ
Limit Limit
(Note 2) (Note 3)
SYSTEM PARAMETERS (Note 4) Test Circuit Figure 2
V
OUT
Feedback Voltage V
IN
= 12V, I
LOAD
= 0.2A 1.230 V
V
OUT
= 5V 1.217 1.217 V(Min)
Circuit of Figure 2 1.243 1.243 V(Max)
V
OUT
Feedback Voltage 0.2A
≤
I
LOAD
≤
1A, 1.230 V
LM1575/LM2575 8V
≤
V
IN
≤
40V 1.205/ 1.193 1.193/ 1.180 V(Min)
V
OUT
= 5V, Circuit of Figure 2 1.255/ 1.267 1.267/ 1.280 V(Max)
V
OUT
Feedback Voltage 0.2A
≤
I
LOAD
≤
1A, 1.230 V
LM2575HV 8V
≤
V
IN
≤
60V 1.205/ 1.193 1.193/ 1.180 V(Min)
V
OUT
= 5V, Circuit of Figure 2 1.261/ 1.273 1.273/ 1.286 V(Max)
η
Efficiency V
IN
= 12V, I
LOAD
= 1A, V
OUT
= 5V 77 %
All Output Voltage Versions
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range . Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version, V
IN
= 25V for the 12V version,
and V
IN
= 30V for the 15V version. I
LOAD
= 200 mA.
Symbol Parameter Conditions Typ LM1575-XX LM2575-XX Units
(Limits)
LM2575HV-XX
Limit Limit
(Note 2) (Note 3)
DEVICE PARAMETERS
I
b
Feedback Bias Current V
OUT
= 5V (Adjustable Version Only) 50 100/ 500 100/ 500 nA
f
O
Oscillator Frequency (Note 13) 52 kHz
47/ 43 47/ 42 kHz(Min)
58/ 62 58/ 63 kHz(Max)
V
SAT
Saturation Voltage I
OUT
= 1A (Note 5) 0.9 V
1.2/ 1.4 1.2/ 1.4 V(Max)
DC Max Duty Cycle (ON) (Note 6) 98 %
93 93 %(Min)
I
CL
Current Limit Peak Current (Notes 5, 13) 2.2 A
1.7/ 1.3 1.7/ 1.3 A(Min)
3.0/ 3.2 3.0/ 3.2 A(Max)
I
L
Output Leakage (Notes 7, 8) Output = 0V 2 2 mA(Max)
Current Output = −1V 7.5 mA
Output = −1V 30 30 mA(Max)
I
Q
Quiescent Current (Note 7) 5 mA
10/ 12 10 mA(Max)
I
STBY
Standby Quiescent ON /OFF Pin = 5V (OFF) 50 µA
Current 200/ 500 200 µA(Max)
LM1575/LM2575/LM2575HV
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