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參數資料
| 型號： | MC34280FTB |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | Power Supply & Management IC for Handheld Electronic Products |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數： | 11/20頁 |
| 文件大小： | 380K |
| 代理商： | MC34280FTB |
MC34280
http://onsemi.com
11
DETAILED OPERATING DESCRIPTION (Cont’d)
Figure 20. Simplified Block Diagram of Main Regulator
+ve Edge Delay
R
S
Q
R
S
Q
Qb
1–SHOT
VBAT
Voltage
Reference
Main Regulator
with Synchronous Rectifier
Voltage Reference
& Current Bias
AGND
1.22 V
0.5 V
x2
RIref
480 kOhm
VMAINFB
CMAINb
100 pF
VCOMP
for Mn. OFF Time
AGND
ILIM
DGND
VDD
RMAINb
1000 kOhm
L1
33uH
CMAIN
100 uF
VMAINSW
VMAINGND
DGND
VDD
M1
M2
senseFET
Iref
2 x Iref
ZLC
for Max. ON Time
COMP2
COMP3
COMP1
VMAIN
+
30
32
31
1
8
IREF
In Figure 22, regulator is operating at Discontinuous
Conduction Mode, waveforms are similar to those of Figure
21. However, coil current drops to zero before next
switching cycle starts.
To estimate conduction mode, below equation can be
used.
Iroom
T
ON
L
Vin2
Vout
2
ILOAD
where,
η
is efficiency, refer to Figure 6
if
Iroom
> 0, the regulator is at Discontinuous Conduction
mode
if
Iroom
= 0, the regulator is at Critical Conduction mode
where coil current just drops to zero and next cycle starts.
if
Iroom
< 0, the regulator is at Continuous Conduction
mode
For Continuous Conduction mode, provided that current
limit is not reached,
TSW
TON
1
Vin
Vout
(S);
Ipk
ILOAD
TON
TSW
1
Vin
TON
L
2
(A)
For Discontinuous Conduction mode, provided that
current limit is not reached,
T2
ON
Vout
TSW
Vin
2
L
ILOAD
Vin
1
(S);
Ipk
Vin
L
TON
(A)
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