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L4978D 数据表(PDF) 5 Page - STMicroelectronics

部件名 L4978D
功能描述  2A STEP DOWN SWITCHING REGULATOR
PDF  13 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4978D 数据表(HTML) 5 Page - STMicroelectronics

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L4978
Figure 4. Test and evaluation board circuit.
Figure 5. PCB and component layout of the figure 4.
OSCILLATOR SECTION
Ramp Valley
0.78
0.85
0.92
V
Ramp peak
Vcc = 8V
2
2.15
2.3
V
Vcc = 55V
9
9.6
10.2
V
Maximum duty cycle
95
97
%
Maximum Frequency
Duty Cycle = 0%
Rosc = 13kΩ, Cosc = 820pF
300
kHz
Table 6. Electrical Characteristcs
(Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 24V, unless otherwise specified). “●" Specification Referred
to Tj from 0 to 125°C
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
D98IN834B
5
2
8
4
1
L4978
C1
220
µF
63V
C8
330
µF
VO=3.3V/2A
Vi=8V to 55V
R1
20K
C2
2.7nF
R2
9.1K
C4
22nF
3
7
L1
126
µH
(77120)
6
D1
STPS3L60U
C5
100nF
C7
220nF
C6
100nF
R3
R4
C1=220
µF/63V EKE
C2=2.7nF
C5=100nF
C6=100nF
C7=220nF/63V
C8=330
µF/35V CG Sanyo
L1=126
µH KoolMu 77120 - 55 Turns - 0.5mm
R1=20K
R2=9.1K
D1=STPS3L60U
VO(V)
R3(K
Ω)
R4(K
Ω)
3.3
5.1
12
15
18
24
0
2.7
12
16
20
30
4.7
4.7
4.7
4.7
4.7
L4978



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