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參數(shù)資料
| 型號： | MC33680FTBR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual DC-DC Regulator for Electronic Organizer |
| 中文描述： | 1.15 A DUAL SWITCHING CONTROLLER, 100 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封裝： | PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 340K |
| 代理商： | MC33680FTBR2 |
MC33680
http://onsemi.com
10
DETAILED OPERATING DESCRIPTION (Cont’d)
Figure 18. 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 20, regulator is operating at Discontinuous
Conduction Mode, waveforms are similar to those of Figure
19. 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 4
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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