參數(shù)資料
型號(hào)： LMK316BJ475ML
廠商： AUK Corp
英文描述： Low Drop Output Voltage Regulator
中文描述： 低壓差穩(wěn)壓器輸出電壓
文件頁(yè)數(shù)： 19/23頁(yè)
文件大?。?/td> 430K
代理商： LMK316BJ475ML
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
GaAs supply (continued)
R
PMAX
can be calculated using the following equation:
R
PMAX
V
CO
V
O
I
O
R
O
With: V
CO
=
–
3.3 V; V
O
=
–
2.7 V; I
O
=
–
3 mA
R
PMAX
= 200
–
52
= 148
A 100-
resistor was selected for R
P
.
The reference voltage across R2 is 1.24 V typical. With 5-
μ
A current for the voltage divider, R2 gets:
R2
1.24 V
5 A
250 k
R1
2.7
1.24 V
5 A
300 k
With C
P
= 1
μ
F the ratio V
O
/V
I
of the RC post filter is:
V
O
V
I
1
1
(2 125000Hz
100
1 F)
2
0.01
step-down charge pump
By exchanging GND with OUT (connecting the GND pin with OUT and the OUT pin with GND), a step-down
charge pump can easily be formed. In the first cycle S1 and S3 are closed, and C
(fly)
with C
O
in series are
charged. Assuming the same capacitance, the voltage across C
(fly)
and C
O
is split equally between the
capacitors. In the second cycle, S2 and S4 close and both capacitors with V
I
/2 across are connected in parallel.
C(fly)
+
1
μ
F
S2
S1
S3
S4
CO
1
μ
F
VO (VI/2)
GND
VI
VO (VI/2)
Figure 34. Step-Down Principle
TPS60400
OUT
C1+
IN
C1
–
GND
1
2
3
5
4
C(fly)
1
μ
F
CO
1
μ
F
CI
1
μ
F
VO (VI/2)
GND
VI
GND
Figure 35. Step-Down Charge Pump Connection
The maximum input voltage between V
I
and GND in the schematic (or between IN and OUT at the device itself)
must not exceed 6.5 V. For input voltages in the range of 6.5 V to 11 V, an additional Zener-diode is
recommended (see Figure 36).
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