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參數(shù)資料
| 型號(hào)： | SG2549 |
| 廠商： | Microsemi Corporation |
| 英文描述： | CURRENT SENSE LATCH |
| 中文描述： | 電流檢測(cè)鎖存 |
| 文件頁(yè)數(shù)： | 3/4頁(yè) |
| 文件大?。?/td> | 74K |
| 代理商： | SG2549 |
4/90 Rev 1.1 2/94
Copyright
1994
L
IN
F
IN
ITY
Microelectronics Inc.
11861 Western Avenue
∞
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX: (714) 893-2570
3
LO Output
Off Leakage
On Voltage
1.0
0.5
.01
.3
1.0
0.5
V
= 40V
I
L
= 5mA
SG1549/SG2549/SG3549
TYPICAL SWITCHING CHARACTERISTICS
(Note 4)
(V
S
= 5V, T
A
= 25
°
C)
Reset Minimum Pulse Width (T
)
Delay from Reset to LO Output (T
D(OFF)
)
LO Input Minimum Pulse Width (T
Delay from LO Input to LO Output (T
D(ON)
)
Delay from HI Input to LO Output (T
D(ON)
)
Delay from HI Output to LO Output
ns
ns
ns
ns
ns
ns
300
600
300
360
900
60
150
300
50
180
300
30
Min. Typ. Max.
SG1549 Series
Test Conditions
Parameter
Units
DYNAMIC TEST CIRCUIT
SWITCHING WAVEFORMS
APPLICATION NOTES
HIGH LINE SENSING -
The SG1549 will provide current sensing in the
positive supply line in the typical SG1524 single-ended switching
regulator application shown in Figure 1. The HI CM sense circuitry can
be used with input voltages between 2 and 40 volts.
A value for R
is determined by dividing the 100mV input threshold by
the peak current desired. High-frequency noise, or switching transients,
can usually be eliminated by a small capacitor between pins 3 and 4.
Current control may be accomplished by either the HI OUTPUT pin
connected to the SG1524’s Shutdown pin, or the LO OUTPUT pin
connected directly to the Compensation Terminal. In either case,
activation of the current sense latch will tend to discharge the compen-
sation capacitor, C
, which may cause slow recovery from pulse limiting.
If this feature is desired, the LO OUTPUT pin may be used to discharge
a soft-start network instead of coupling directly to the SG1524. If it is not
desired, the use of a small value of C
C
, and perhaps a diode across R
C
,
will enhance recovery.
ELECTRICAL CHARACTERISTICS
(V
S
= 5V, and over recomended operating temperature, unless otherwise specified.)
Min. Typ. Max. Min. Typ. Max.
SG3549
SG1549/2549
Test Conditions
Parameter
Units
Amplitude = 3.0V
R
= 470
to V
LO CM Amplitude = 200mV
LO CM Amplitude = 200mV, R
L
= 470
to V
S
Amplitude = 200mV, V
CM
= 5V
LO CM Input = 200mV
Off Voltage
On Voltage
0
3.2
0.1
V
V
0
3.2
0.1
I
L
= 1mA
2.8
Note 4: These parameters, although guaranteed, are not tested in production.
FIGURE 1 — HIGH LINE SENSING WITH THE SG1549 IN CONJUNCTION
WITH AN SG1524 PWM CONTROL IC
HI Output Section
2.8
.01
.3
μ
A
V
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