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參數(shù)資料
| 型號： | MC34280 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Power Supply & Management IC for Handheld Electronic Products(用于手提電子產(chǎn)品的電源管理芯片) |
| 中文描述： | 電源供應(yīng)器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 378K |
| 代理商： | MC34280 |
MC34280
http://onsemi.com
14
DETAILED OPERATING DESCRIPTION (Cont’d)
Auxiliary Regulator (Cont’d)
As the Auxiliary Regulator control scheme is the same as
the Main Regulator, equations for conduction mode, Tsw
and Ipk can also be applied, However, to be used for
caculation is refered to Figure 8, 10, or 12.
If external potentiometer is used for voltage level
adjustment, internal 1.22V reference voltage can be used as
shown in the application diagram of Figure 24.
Current Limit for Both regulators
From Figure 20 and Figure 23, sense devices (senseFET
or senseBJT) are applied to sample coil current as the
low–side switch is ON. With that sample current flowing
through a sense resistor, sense–voltage is developed.
Threshold detector (COMP2 in both figures) detects
whether the sense–voltage is higher than preset level. If it
happens, detector output reset the flip–flop to switch OFF
low–side switch, and the switch can only be ON as next
cycle starts.
Figure 24. Application Diagram with External Potentiometer for VAUX Adjustment
16
15
14
13
12
11
10
9
25
26
27
28
29
30
31
32
17
18 19 20
21 22
23 24
8
7
6
5
4
3
2
1
CMAINb
c = 100p
RMAINb
r = 1000 k
VBAT
VBAT
Vref
LIBATCL
LIBATON
LOWBAT
PORB
VAUXEN
GND
VBAT
VBAT
VAUX
GND
GND
RLBb
r = 900 k
RLBa
r = 300 k
Riref
r = 480 k
GND
GND
GND
GND
GND
GND
GND
Cpor
c = 80n
CVDD
c = 20u
GND
MC34280
1N5818
1N5817
GND
LMAIN
L = 33uH
CMAIN
c = 100u
GND
GND
GND
Caux
c = 30u
LAUX
L = 33uH
Rauxa
r = 200 k
Rauxb
r = 2.2 M
Ren
r = 1000 k
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