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L4990 Datasheet(PDF) 7 Page - STMicroelectronics

Part # L4990
Description  PRIMARY CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4990 Datasheet(HTML) 7 Page - STMicroelectronics

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-50
-25
0
25
50
75
100
125
150
280
290
300
310
320
Tj (
°C)
fsw (KHz)
Rt= 4.5Kohm, Ct = 1nF
Vcc = 15V, V15=Vref
Figure 14. Switching frequency vs. temperature.
10
0
0.2
0.4
0.6
0.8
1
1.2
6
8
10
12
14
16
Isourc e [A]
V sat = V [V]
Vcc = 15V
Tj = 25
°C
Figure 10. Output saturation.
0
0.2
0.4
0.6
0.8
1
1.2
0
0.5
1
1.5
2
2.5
Is ink [A]
10
Vsat = V
[V ]
Vcc = 15V
Tj = 25
°C
Figure 11. Output saturation.
1
10
100
1000
10000
0
40
80
120
fsw (Hz)
SVRR (dB)
Vcc=15V
Vp-p=1V
Figure 9. Vref SVRR vs. switching frequency.
10
20
30
40
10
20
50
100
200
500
1000
2000
5000
Rt (kohm)
fsw(KHz)
100pF
220pF
470pF
1nF
2.2nF
5.6nF
Tj= 25
°C
Vcc =15V,V15 =0V
Figure13. Timingresistorvs.switchingfrequency.
0
200
400
600
800
1,000 1,200 1,400
0
10
20
30
40
50
Vpin10 [mV]
Ipin10 [mA]
Vcc < Vccon
before turn-on
Figure 12. UVLO Saturation
L4990 - L4990A
7/24


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