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參數(shù)資料
| 型號： | TCA7660 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER |
| 中文描述： | 高頻7660型DC - DC電壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 76K |
| 代理商： | TCA7660 |
4
TC7660H
HIGH FREQUENCY 7660 DC-TO-DC
VOLTAGE CONVERTER
TC7660H-2 10/1/96
2001 Microchip Technology Inc. DS21466A
2
2
π
f
C
1
X
C
= = 2.12
,
where f = 150kHz and C
1
= 1.0
μ
F.
R
OUT
(of TC7660H)
n (number of devices)
R
OUT
=
Paralleling Devices
Any number of TC7660H voltage converters may be
paralleled to reduce output resistance (Figure 4). The reser-
voir capacitor, C
2
, serves all devices, while each device
requires its own pump capacitor, C
1
. The resultant output
resistance would be approximately:
Cascading Devices
The TC7660H may be cascaded as shown in (Figure 4)
to produce larger negative multiplication of the initial supply
voltage. However, due to the finite efficiency of each device,
the practical limit is probably 10 devices for light loads. The
output voltage is defined by:
V
OUT
= – n (V
IN
)
where n is an integer representing the number of devices
cascaded. The resulting output resistance would be ap-
proximately the weighted sum of the individual TC7660H
R
OUT
values.
Changing the TC7660H Oscillator Frequency
It may be desirable in some applications (due to noise or
other considerations) to increase or decease the oscillator
frequency. This can be achieved by overdriving the oscilla-
tor from an external clock, as shown in Figure 6. In order to
prevent possible device latch-up, a 1k
resistor must be
used in series with the clock output. In a situation where the
designer has generated the external clock frequency using
TTL logic, the addition of a 10k
pull-up resistor to V
+
supply
is required. Note that the pump frequency with external
clocking, as with internal clocking, will be 1/2 of the clock
frequency. Output transitions occur on the positive-going
edge of the clock.
Simple Negative Voltage Converter
Figure 3 shows typical connections to provide a nega-
tive supply where a positive supply is available. A similar
scheme may be employed for supply voltages anywhere in
the operating range of +1.5V to +10V, keeping in mind that
pin 6 (LV) is tied to the supply negative (GND) only for supply
voltages below 3.5V.
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 70
.
Thus, for a load current of – 10 mA and a supply voltage of
+5V, the output voltage would be – 4.3V.
The dynamic output impedance of the TC7660H is due,
primarily, to capacitive reactance of the charge transfer
capacitor (C
1
). Since this capacitor is connected to the
output for only 1/2 of the cycle, the equation is:
1
2
3
4
8
7
6
5
TC7660H
1.0
μ
F
+
V
+
1.0
μ
F
+
VOUT
*
1. VOUT=
–
n V+for 1.5V V+ 10V
NOTES:
*
C1
C2
Figure 3. Simple Negative Converter
Figure 4. Increased Output Voltage by Cascading Devices
1
2
3
4
8
7
6
5
V+
1
2
3
4
8
7
6
5
1.0
μ
F
1.0
μ
F
"n"
"1"
1.0
μ
F
VOUT
1. VOUT=
–
n V+for 1.5V V 10V
NOTES:
*
*
+
+
+
TC7660H
TC7660H
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