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參數(shù)資料
| 型號： | MC33567D-2R2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Dual Linear Controller for High Current Voltage Regulation |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 88K |
| 代理商： | MC33567D-2R2 |
MC33567
http://onsemi.com
6
The output capacitor capacitance and ESR required for
using the MTD3055VL as external driver are calculated as
follows:
1
Ci· Ro
(1240 pF
600 pF) · (50
f
1
)
10.87 MHz
p
1
1
1
f
1
1
5 MHz
1
10.87 MHz
1
3.42 MHz
1
20 · 1
a
(3 ·
p)
·
1
gm
Rs
(3 ·
p)
a
·
1
gm
1
20 · 1
5 MHz
(3 · 3.42 MHz)
·
1
8.8 mhos
Rs
(3 · 3.42 MHz)
5 MHz
·
1
8.8 mhos
3.8 m
Rs
233.2 m
selecting an ESR of 30 m , we have:
Co
5
Rs
·
1
a
1
p
Co
5
30 m
·
1
5 MHz
1
3.42 MHz
Co
82.07 F
100
μ
F is selected as it is an industry standard value.
Please note that if the system is designed to work with
several drivers, the system has to be designed around the
driver with higher gain to insure stability for all of them.
The design guidelines discussed in this section are
conservative enough that satisfactory results may be
obtained with devices that lie just outside of these
guidelines, although deviation from these guidelines will
generally cause instability. For a more detailed analysis on
linear regulators stability please refer to ON Semiconductor
application note AND8037/D.
Adjustable Output Voltage:
The MC33567 will regulate Vout to its preset voltage level,
referenced at the sense pin. However, other Vout levels can
be obtained scaling the sense voltage. This is done using a
resistive network between the load and the sense pin as
shown in Figure 6.
Figure 6. Output Voltage Scaling Using
Resistive Network
SENSE
Vin
R2
DRV
RINT
+
Vout(new)
+
Vout
R1
ISENSE
1.8 k
The regulator will increase the load voltage until the
SENSE pin voltage reaches the regulator voltage level, Vout.
The new output voltage, Vout(new), is calculated as follows:
Vout(new)
Vout
R1*
Vout
R2
ISENSE
Please note that in this configuration R2 and the sense
internal resistor are in parallel. The parallel combination
will reduce the effective resistance of R2. If R2 is in the range
of RINT, the parallel combination will be almost half of the
original intended value of R2. This will cause Vout(new) to be
smaller than calculated using the above equation. This is
avoided making R2 as small as possible, probably in the
range of 10 to 50 Ohms. Vout(new) is limited by the external
driver drain current and its required GateSource voltage as
well as the Drive Output Voltage, Vdrv.
PCB Layout Guidelines
It is recommended that the MC33567 be placed as
physically close as possible to the external series pass
MOSFET transistors. Use short traces to minimize
extraneous signals from being induced on the SENSE or
DRV line. Also, avoid routing the SENSE line near the load
and input current path, as well as the GND return current
path to prevent signal coupling.
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