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參數(shù)資料
| 型號： | RM4190D |
| 廠商： | Raytheon Company |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 19/25頁 |
| 文件大?。?/td> | 174K |
| 代理商： | RM4190D |
RC4190
PRODUCT SPECIFICATION
19
When the switch is the down position, the capacitor charges
up to the battery voltage. The, when the switch is changed to
the up position, the capacitor is put in series connection with
the battery, and the doubled voltage is applied directly to the
positive power supply lead of the RC4190. This voltage is
enough to bias the junctions internal to the RC4190 and gets
it started. Then, when the stepped up output voltage reaches
a high enough value, diode D1 is forward biased and the out-
put voltage takes over supplying power to the RC4190. The
circuit is shown with component values for +5V output, but
the circuit can be set up for other voltages.
Electricity Versus Magnetism
Electrically the inductor must meet just one requirement, but
that requirement can be hard to satisfy. The inductor must
exhibit the correct value of inductance (L, in Henrys) as the
inductor current rises to its highest operating value (I
MAX
).
This requirement can be met most simply by choosing a very
large core and winding it until it reaches the correct induc-
tance value, but that brute force technique wastes size,
weight and money. A more efficient design technique must
be used.
Question:
What happens if too small a core is used
First, one must understand how the inductor's magnetic field
works. The magnetic circuit in the inductor is very similar to
a simple resistive electrical circuit (see Figure 20). There is a
magnetizing force (H, in oersteds), a flow of magnetism, or
flux density (B, in Gauss), and resistance to the flux, called
permeability (U, in Gauss per oersted). H is equivalent to
voltage in the electrical model, flux density is like current
flow, and permeability is like resistance (except for two
important differences discussed on the following page).
First Difference:
Permeability, instead of being analogous
to resistance, is actually more like conductance (1/R). As
permeability increases, flux increases.
Second Difference:
Resistance is a linear function. As volt-
age increases, current increases proportionally, and the resis-
tance value stays the same. In a magnetic circuit the value of
permeability varies as the applied magnetic force varies.
This nonlinear characteristic is usually shown in graph form
in ferrite core manufacturer's data sheets. See Figure 26.
Figure 25. Electricity Versus Magnetism
Figure 26. Typical Manufacturer’s Curve Showing Saturation Effect
E
I
R
E = I * R
65-3464-07
North
Electrical Circuit
Magentic Circuit
South
Flux
H =B
1
U
6
6000
5000
4000
3000
2000
1000
0
-0.5 0 0.5 1
2 2.5 3
5
7
9
B
H Oersteds
+25
°
C
+85
°
C
+125
°
C
Stackpole Ceramag 24B
Hysteresis Loop vs. Temperature
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