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參數(shù)資料
| 型號： | MC33998 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Switching Power Supply with Linear Regulators(帶線性穩(wěn)壓器的開關(guān)電源) |
| 中文描述： | 開關(guān)電源與線性穩(wěn)壓器（帶線性穩(wěn)壓器的開關(guān)電源） |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 437K |
| 代理商： | MC33998 |
33998
10
Go to: www.freescale.com
DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 9.0 V
≤
V
PWR
≤
16 V, -40
°
C
≤
T
J
= T
A
≤
125
°
C using the typical application circuit (see
Figure 8
) unless otherwise noted. Typical values noted reflect the approximate parameter mean at T
A
= 25
°
C under nominal
conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
BUCK REGULATOR V
DDH
Switching Frequency (Note 14)
f
SW
–
750
–
kHz
Soft Start Duration (see
Figure 2
)
V
PWR
= KA_V
PWR
= 6.0 V
t
SS
5.0
–
15
ms
CHARGE PUMP C
RES
Charge Pump Current Ramp-Up Time
V
PWR
= KA_V
PWR
= 14 V, C
RES
= 22 nF, V
CP
= 1.0 V to 11 V
t
CRES
1.0
–
20
ms
Charge Pump Ramp-Up Time
V
PWR
= KA_V
PWR
= 7.0 V, C
RES
= 22 nF, V
CP
= 7.0 V to 10 V
t
CRES
1.0
–
10
ms
SENSOR SUPPLIES V
REF1
, V
REF2
V
REF
Overcurrent Detection Time (see
Figure 3
)
V
REF
Load R
L
= 5.0
to GND, V
DDH
= 5.1 V, V
PWR
= KA_V
PWR
= 10 V,
EN = 5.0 V, SNSEN = 5.0 V
t
Det
0.5
–
2.0
μ
s
V
REF
Retry Timer Delay (see
Figure 3
)
V
REF
Load R
L
= 5.0
to GND, V
DDH
= 5.1 V, V
PWR
= KA_V
PWR
= 10 V,
EN = 5.0 V, SNSEN = 5.0 V
t
Ret
5.0
–
20
ms
SUPERVISORY CIRCUITS
PWROK Delay Time (Power-On Reset) (see
Figure 4
)
t
D(PWROK)
5.0
–
15
ms
VKAMOK Delay Time (see
Figure 5
)
t
D(VKAMOK)
10
–
30
ms
V
DDH
Power-Up Delay Time (see
Figure 6
)
t
D(VPWR)
1.0
–
10
ms
Fault-Off Timer Delay Time (see
Figure 7
)
t
Fault
1.0
–
10
ms
Notes
14.
Guaranteed by design but not production tested.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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