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参数资料
| 型号： | L4977A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 11 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PZFM15 |
| 封装： | PLASTIC, POWER PACK-15 |
| 文件页数： | 21/21页 |
| 文件大小： | 6754K |
| 代理商： | L4977A |
PARTS LIST
R1 = 30K
C1, C2 = 3300
F 63VL EYF (ROE
R2 = 10K
C3, C4, C5, C6 = 2.2
F
R3 = 15K
C7 = 390pF Film
R4 = 16K
C8 = 22nF MKT 1817 (ERO)
R5 = 22
0,5W
R6 = 4K7
C9 = 2.2nF KP1830
R7 = 10
C10 = 220nF MKT
R8 = see tab. A
C11 = 2.2nF MP1830
R9 = OPTION
**C12, C13, C14 = 220
F 40VL EKR
R10 = 4K7
C15 = 1
F Film
R11 = 10
D1 = MBR 1560CT (or 16A/60V or equivalent)
L1 = 40
H
core 58071 MAGNETICS
27 TURNS 1,3mm (AWG 16)
COGEMA 949178
* 2 capacitors in parallel to increase input RMS current capability
** 3 capacitors in parallel to reduce total output ESR
Table B
SUGGESTED BOOTSTRAP CAPACITORS
Operating Frequency
Bootstrap Cap.c10
f = 20KHz
≥680nF
f = 50KHz
≥470nF
f = 100KHz
≥330nF
f = 200KHz
≥220nF
f = 500KHz
≥100nF
Figure 6a: P.C. Board (components side) and Components Layout of Figure 5 (1:1 scale).
Table A
V0
R9
R7
12V
15V
18V
24V
4.7k
4.7k
4.7k
4.7k
6.2kW
9.1k
12k
18k
L4977A
9/21
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