參數(shù)資料
型號(hào): JMK316BJ106KL
廠商: Texas Instruments, Inc.
英文描述: UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
中文描述: 未穩(wěn)壓60 mA充電泵電壓型逆變器
文件頁(yè)數(shù): 11/23頁(yè)
文件大小: 430K
代理商: JMK316BJ106KL
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)
RPMAX can be calculated using the following equation:
R
PMAX +
V
CO *
V
O
I
O
* R
O
With: VCO = –3.3 V; VO = –2.7 V; IO = –3 mA
RPMAX = 200 – 52 = 148
A 100-
resistor was selected for RP.
The reference voltage across R2 is 1.24 V typical. With 5-
A current for the voltage divider, R2 gets:
R2
+ 1.24 V
5
mA [
250 k
W
R1
+ 2.7 * 1.24 V
5
mA
[ 300 kW
With CP = 1 F the ratio VO/VI of the RC post filter is:
V
O
V
I
+
1
) (2p125000Hz
100
W
1
mF)
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 CO in series are
charged. Assuming the same capacitance, the voltage across C(fly) and CO is split equally between the
capacitors. In the second cycle, S2 and S4 close and both capacitors with VI/2 across are connected in parallel.
C(fly)
1
F
S2
S1
S3
S4
CO
1
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
F
CO
1
F
CI
1
F
VO (VI/2)
GND
VI
GND
Figure 35. Step-Down Charge Pump Connection
The maximum input voltage between VI 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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