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參數(shù)資料
| 型號： | TK11830 |
| 廠商： | TOKO Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | POSITIVE-TO-NEGATIVE DC-DC CONVERTER |
| 中文描述： | 正到負DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 85K |
| 代理商： | TK11830 |
Page 8
January 1999 TOKO, Inc.
TK11830
POLARITY-INVERTING OPERATION
V
SAT
V
F
I
L
I
C
I
LOAD
V
L
Power Transistor Saturation Voltage
Diode Forward Voltage Drop
Inductor Current
Capacitor Current
Load Current
Inductor Voltage
where:
V
L
= L x (di
L
/ d
t
) and V
L
= a constant value: I
L
= (V
L
/ L) x t
During the charge cycle:
I
LPK
= [(V
IN
- V
SAT
) x t
ON
]
/ L
(1)
During the discharge cycle:
I
LPK
= [(|V
OFF
| + V
F
) x t
OFF
]
/ L
(I
L
= 0 after t
OFF
)
(2)
From (1) and (2):
t
ON
/ t
OFF
= (|V
OUT
| + V
F
) / (V
IN
- V
SAT
)
(3)
When I
L
= I
C
+ I
LOAD
and output voltage are in a steady
state, the change of the charge/discharge must be
equivalent, so:
Q
+
=
Q
1
-
+
Q
2
-
And:
I
LPK
= 2 x I
LOAD
x [(t
ON
/ t
OFF
) + 1]
(4)
Ripple Voltage:
V
RIPPLE
=
Q
+
/ C
OUT
= (I
LPK
- I
LOAD
)
2
x
t
OFF
/ 2C
OUT
x I
LPK
~ I
LOAD
x t
ON
/ C
OUT
(5)
CIRCUIT OPERATION (CONT.)
VIN
VSAT
VF
CONTROL
L
IL
COUT
+
VOUT
ILOAD
IC
IC
ILPK - ILOAD
Q1-
Q+
Q2-
C
ILOAD
R
VRIPPLE
ON
OFF
VIN - VSAT
-(|VOUT| + VF)
I
ILPK
IL
tON
tOFF
CHARGE
DISCHARGE
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|---|---|
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