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TC7660IJA データシート(PDF) 6 Page - TelCom Semiconductor, Inc

部品番号 TC7660IJA
部品情報  CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
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メーカー  TELCOM [TelCom Semiconductor, Inc]
ホームページ  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC7660IJA データシート(HTML) 6 Page - TelCom Semiconductor, Inc

  TC7660IJA Datasheet HTML 1Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 2Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 3Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 4Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 5Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 6Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 7Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 8Page - TelCom Semiconductor, Inc TC7660IJA Datasheet HTML 9Page - TelCom Semiconductor, Inc  
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TELCOM SEMICONDUCTOR, INC.
TC7660
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
The TC7660 approaches these conditions for negative
voltage multiplication if large values of C1 and C2 are used.
Energy is lost only in the transfer of charge between
capacitors if a change in voltage occurs. The energy lost
is defined by:
E = 1/2 C1 (V1
2 – V
2
2)
V1 and V2 are the voltages on C1 during the pump and
transfer cycles. If the impedances of C1 and C2 are relatively
high at the pump frequency (refer to Figure 2), compared to
the value of RL, there will be a substantial difference in
voltages V1 and V2. Therefore, it is not only desirable to
make C2 as large as possible to eliminate output voltage
ripple, but also to employ a correspondingly large value for
C1 in order to achieve maximum efficiency of operation.
Dos and Don'ts
• Do not exceed maximum supply voltages.
• Do not connect LV terminal to GND for supply voltages
greater than 3.5V.
• Do not short circuit the output to V
+ supply for voltages
above 5.5V for extended periods; however, transient
conditions including start-up are okay.
• When using polarized capacitors in the inverting mode,
the + terminal of C1 must be connected to pin 2 of the
TC7660 and the + terminal of C2 must be connected to
GND Pin 3.
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.
Figure 3. Simple Negative Converter
Paralleling Devices
Any number of TC7660 voltage converters may be
paralleled to reduce output resistance (Figure 4). The reser-
voir capacitor, C2, serves all devices, while each device
requires its own pump capacitor, C1. The resultant output
resistance would be approximately:
ROUT (of TC7660)
n (number of devices)
ROUT =
2
2
πf C1
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 70
Ω.
Thus, for a load current of – 10mA and a supply voltage of
+5V, the output voltage would be – 4.3V.
The dynamic output impedance of the TC7660 is due,
primarily, to capacitive reactance of the charge transfer
capacitor (C1). Since this capacitor is connected to the
output for only 1/2 of the cycle, the equation is:
XC =
= 3.18
Ω,
where f = 10kHz and C1 = 10µF.
1
2
3
4
8
7
6
5
TC7660
10
µF
+
V
+
10
µF
+
VOUT*
1. VOUT = –n V
+
for 1.5V
≤ V+ ≤ 10V
NOTES:
*
C1
C2


同様の部品番号 - TC7660IJA

メーカー部品番号データシート部品情報
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Microchip Technology
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同様の説明 - TC7660IJA

メーカー部品番号データシート部品情報
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Microchip Technology
TC7660 MICROCHIP-TC7660 Datasheet
91Kb / 12P
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