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LX1555CDM

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
OBSOLETE PRODUCT
NOT RECOMMENDED FOR NEW DESIGNS
U
LTRA
-L
OW
S
TART
-U
P
C
URRENT
, C
URRENT
-M
ODE
PWM
LX1552/3/4/5
PRODUCT DATABOOK 1996/1997
7
Copyright © 1994
Rev. 1.0b
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 6. — OUTPUT DUTY CYCLE vs. TEMPERATURE
FIGURE 7. — REFERENCE VOLTAGE vs. TEMPERATURE FIGURE 8. — REFERENCE SHORT CIRCUIT CURRENT vs.
TEMPERATURE
FIGURE 5. — OUTPUT INITIAL ACCURACY vs. TEMPERATURE
40
44
(T
A
) Ambient Temperature - (°C)
Output Duty Cycle - (%)
42
45
41
46
47
43
-75
-50 -25 0 25 50 75 100 125
48
V
CC
= 15V
R
T
= 698
W
C
T
= 22nF
50.0
56.0
(T
A
) Ambient Temperature - (°C)
Output Initial Accuracy - (kHz)
53.0
57.5
51.5
59.0
60.5
54.5
-75
-50 -25 0 25 50 75 100 125
62.0
V
CC
= 15V
R
T
= 698
W
C
T
= 22nF
63.5
65.0
LX1552 and LX1553 only
4.95
4.99
(T
A
) Ambient Temperature - (°C)
(V
REF
) Reference Voltage - (V)
4.97
5.00
4.96
5.01
5.02
4.98
-75
-50 -25 0 25 50 75 100 125
5.03
V
CC
= 15V
I
L
= 1mA
30
90
(T
A
) Ambient Temperature - (°C)
(I
SC
) Reference Short Circuit Current - (mA)
60
105
45
120
135
75
-75
-50 -25 0 25 50 75 100 125
180
150
165
OBSOLETE PRODUCT
NOT RECOMMENDED FOR NEW DESIGNS
U
LTRA
-L
OW
S
TART
-U
P
C
URRENT
, C
URRENT
-M
ODE
PWM
LX1552/3/4/5
PRODUCT DATABOOK 1996/1997
Copyright © 1994
Rev. 1.0b
8
P
RODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 10. — START-UP CURRENT vs. TEMPERATURE
FIGURE 11. — START-UP CURRENT vs. SUPPLY VOLTAGE FIGURE 12. — START-UP CURRENT vs. SUPPLY VOLTAGE
FIGURE 9. — E.A. INPUT VOLTAGE vs. TEMPERATURE
0
100
(T
A
) Ambient Temperature - (°C)
(I
ST
) Start-Up Current - (µA)
50
125
25
150
175
75
-75
-50 -25 0 25 50 75 100 125
250
200
225
LX1552/LX1554
LX1553/LX1555
2.45
2.49
(T
A
) Ambient Temperature - (°C)
E.A. Input Voltage - (V)
2.47
2.50
2.46
2.51
2.52
2.48
-75
-50 -25 0 25 50 75 100 125
2.55
2.53
2.54
V
CC
= 15V
0
100
(V
CC
) Supply Voltage - (V)
(I
ST
) Start-Up Current - (µA)
50
125
25
150
175
75
0
2 4 6 8 10 12 14 20
250
200
225
16 18
LX1553/LX1555
T
A
= 25°C
0
100
(V
CC
) Supply Voltage - (V)
(I
ST
) Start-Up Current - (µA)
50
125
25
150
175
75
0
1234567 10
250
200
225
89
LX1552/LX1554
T
A
= 25°C
OBSOLETE PRODUCT
NOT RECOMMENDED FOR NEW DESIGNS
U
LTRA
-L
OW
S
TART
-U
P
C
URRENT
, C
URRENT
-M
ODE
PWM
LX1552/3/4/5
PRODUCT DATABOOK 1996/1997
9
Copyright © 1994
Rev. 1.0b
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 14. — CURRENT SENSE DELAY TO OUTPUT vs.
TEMPERATURE
FIGURE 15. — CURRENT SENSE THRESHOLD vs.
ERROR AMPLIFIER OUTPUT
FIGURE 16. — START-UP THRESHOLD vs. TEMPERATURE
FIGURE 13. — DYNAMIC SUPPLY CURRENT vs.
OSCILLATOR FREQUENCY
0
120
(T
A
) Ambient Temperature - (°C)
(T
pd
) C.S. Delay to Output - (ns)
60
150
30
180
210
90
-75
-50 -25 0 25 50 75 100 125
300
240
270
V
CC
= 15V
V
PIN3
= 0V to 2V
C
L
= 1nF
100
10
0
12
Oscillator Frequency - (kHz)
30
(I
CC
) Dynamic Supply Current - (mA)
6
15
24
1000
3
18
21
27
9
T
A
= 25°C
R
T
= 10k
C
L
= 1000pF
V
IN
= 16V
V
IN
= 12V
V
IN
= 10V
7.8
8.2
(T
A
) Ambient Temperature - (°C)
Start-Up Trheshold - (V)
8.0
8.3
7.9
8.4
8.5
8.1
-75
-50 -25 0 25 50 75 100 125
8.6
LX1553
LX1555
8.7
8.8
0
0.4
Error Amplifier Output Voltage - (V)
Current Sense Threshold - (V)
0.2
0.5
0.1
0.6
0.7
0.3
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 5.0
1.0
0.8
0.9
4.0 4.5
T
A
= 25°C
1.1
T
A
= 125°C
T
A
= -55°C
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LX1555CDM

Mfr. #:
Buy LX1555CDM
Manufacturer:
Microchip / Microsemi
Description:
IC REG CTRLR BUCK/BOOST 8SOIC
Lifecycle:
New from this manufacturer.
Delivery:
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