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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： | 20/21页 |
| 文件大小： | 6754K |
| 代理商： | L4977A |
ELECTRICAL CHARACTERISTICS (continued)
RESET AND POWER FAIL FUNCTIONS
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V11R
Rising Threshold Voltage
(pin 11)
Vi = 15 to 50V
V3 = 5.3V
Vref
–120
Vref
–100
Vref
–80
V
mV
7D
V11F
Falling Threshold Voltage
(pin 11)
Vi = 15 to 50V
V3 = 5.3V
4.77
Vref
–200
Vref
–160
V
mV
7D
V5H
Delay High Threshold
Voltage
Vi = 15 to 50V
V11 = V14
V3 = 5.3V
4.95
5.1
5.25
V
7D
V5L
Delay Low Threshold
Voltage
Vi = 15 to 50V
V11 = V14
V3 = 5.3V
1
1.1
1.2
V
7D
–I5SO
Delay Source Current
V3 = 5.3V; V5 = 3V
40
60
80
A7D
I5SI
Delay Sink Current
V3 = 4.7V; V5 = 3V
10
mA
7D
V4S
Out Saturation Voltage
I4 = 15mA; S1 = B
V3 = 4.7V
0.4
V
7D
I4
Output Leak Current
V4 = 50V; S1 = A
V3 = 5.3V
100
A7D
V3R
Rising Threshold Voltage
V11 = V14
4.95
5.1
5.25
V
7D
V3H
Hysteresys
0.4
0.5
0.6
V
7D
I3
Input Bias Current
1
3
A7D
Figure 5: Test and Evaluation Board Circuit
TYPICAL PERFORMANCES (using evaluation board) :
n = 83% (Vi = 35V ; Vo = VREF ; Io = 7A ; fSW = 200KHz)
Vo RIPPLE = 30mV (at 7A) with output filter capacitor ESR
≤ 60m
Line regulation = 5mV (Vi = 15 to 50V)
Load regulation = 15mV (Io = 2 to 7A)
For component values, refer to test circuit part list.
L4977A
8/21
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