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參數(shù)資料
| 型號： | AN8049SH |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Dual 14-Bit nanoDAC® with 5 ppm/°C On-Chip Reference; Package: MSOP; No of Pins: 10; Temperature Range: Automotive |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 18/23頁 |
| 文件大?。?/td> | 170K |
| 代理商： | AN8049SH |
AN8049FHN
Voltage Regulators
18
I
Application Notes (continued)
[5] Time constant setup for the timer latch short-circuit protection circuit
Figure 6 shows the structure of the timer latch short-circuit protection circuit. The short-circuit protection
comparator continuously compares a 0.9 V reference voltage with the FB1, FB2, and FB3 error amplifier outputs.
When the DC-DC converter output load conditions are stable, the short-circuit protection comparator holds its
average value since there are no fluctuations in the error amplifier outputs. At this time, the output transistor Q1 will
be in the conducting state, and the S.C.P. pin will be held at 0 V.
If the output load conditions change rapidly and a high-level signal (0.9 V or higher) is input to the short-circuit
protection comparator from the error amplifier output, the short-circuit protection comparator will output a low level
and the output transistor Q1 will shut off. Then, the capacitor C
SCP
connected to the S.C.P. pin will start to charge.
When the external capacitor C
SCP
is charged to about 1.26 V by the constant current of about 1.1 mA, the latch circuit
will latch and the dead-time will be set to 100% with the output held fixed at the low level. Once the latch circuit has
latched, the S.C.P. pin capacitor will be discharged to about 0 V, but the latch circuit will not reset unless either power
is turned off or the power supply is restarted using on/off control.
1.26 V
=
I
CHG
×
t
PE
C
SCP
∴
t
PE
(s)
=
1.15
×
C
SCP
(
μ
F)
At power supply startup, the output appears to be
in the shorted state, and the IC starts to charge the
S.C.P. pin capacitor. Therefore, users must select an
external capacitor that allows the DC-DC converter
output voltage to rise before the latch circuit in the
later stage latches. In particular, care is required if the
soft start function is used, since that function makes
the startup time longer.
Figure 5. S.C.P. pin charging waveform
Figure 6. Short-circuit protection circuit
Short-circuit detection time t
PE
t (s)
0
1.26
V
SCP
(V)
FB2
FB3
FB1
0.9 V
S.C.P. comp.
S.C.P.
High level detection comparator
1.26 V
V
REF
V
CC
Q1
On/off control
1.1
μ
A
U.V.L.O.
R
S
Q
Latch
Output shutoff
22
18
20
2
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