L4971 STMicroelectronics, L4971 Datasheet - Page 9

• Manufacturer Part Number: L4971
• Description: IC REG SW 1.5A STEP DOWN 8-DIP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4971

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3 ~ 50 V
• Current - Output: 1.5A
• Frequency - Switching: 100kHz ~ 300kHz
• Voltage - Input: 8 ~ 55 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Power - Output: 1W
• Output Voltage: 50 V
• Mounting Style: Through Hole
• For Use With: 497-4744 - BOARD EVAL FOR L4971/L4978 REG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6697-5; E-L4971; E-L4971; L4971

Figure 24. Load transient.
Figure 25. Line transient.
Figure 26. Soft start capacitor selection Vs
V
1
2
(µH)
(V)
30
20
10
400
300
200
100
CC
L
0
15 20 25 30 35 40 45 50 V
inductor and Vccmax.
1ms/DIV
fsw=100KHz
680nF
I
f
O
sw
= 1A
= 100KHz
D97IN786
220nF
470nF
100nF
330nF
D97IN745
CCmax
(mV)
-100
100
V
0
(V)
O
Figure 27. Soft start capacitor selection vs.
Figure 28. Open loop frequency and phase of
(µH)
GAIN
300
200
100
-100
-150
-200
(dB)
-50
50
L
0
0
10
15 20 25 30 35 40 45 50 V
Inductor and Vccmax
error amplifier
10
2
10
3
fsw=200KHz
10
4
10
5
10
6
Phase
GAIN
10
7
10
D97IN787
22nF
56nF
8
D97IN746
47nF
33nF
CC
f(Hz)
max(V)
Phase
135
45
90
0
L4971
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