Datasheet > 7660CPA

7660CPA

更新时间： 2024-10-28 04:01:15

品牌	Logo	应用领域
英特矽尔 - INTERSIL		转换器
页数	文件大小	规格书
11页	275K
描述
CMOS Voltage Converters

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7660CPA 数据手册

ICL7660, ICL7660A

Typical Performance Curves (Test Circuit of Figure 11) (Continued)

100

20.0

18.0

16.0

14.0

12.0

10.0

8.0

= 25°C

V+ = 2V

I+

EFF

6.0

-1

-2

4.0

= 25°C

SLOPE 150Ω

2.0

V+ = 2V

4.5 6.0

LOAD CURRENT I (mA)

1.5

3.0

7.5

9.0

LOAD CURRENT I (mA)

FIGURE 9. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT

CURRENT

FIGURE 10. SUPPLY CURRENT AND POWER CONVERSION

EFFICIENCY AS A FUNCTION OF LOAD

CURRENT

NOTE:

6. These curves include in the supply current that current fed directly into the load R from the V+ (See Figure 11). Thus, approximately half the

supply current goes directly to the positive side of the load, and the other half, through the ICL7660/ICL7660A, to the negative side of the load.

Ideally, V

∼ 2V , I ∼ 2I , so V x I ∼ V

x I .

OUT L

OUT

V+

(+5V)

ICL7660

10µF

ICL7660A

OSC

(NOTE)

-V

OUT

10µF

NOTE: For large values of C

(>1000pF) the values of C and C2 should be increased to 100µF.

OSC

FIGURE 11. ICL7660, ICL7660A TEST CIRCUIT

In the ICL7660 and ICL7660A, the 4 switches of Figure 12

are MOS power switches; S is a P-Channel device and S ,

Detailed Description

The ICL7660 and ICL7660A contain all the necessary

circuitry to complete a negative voltage converter, with the

exception of 2 external capacitors which may be inexpensive

10µF polarized electrolytic types. The mode of operation of

the device may be best understood by considering Figure

12, which shows an idealized negative voltage converter.

S and S are N-Channel devices. The main difficulty with

this approach is that in integrating the switches, the

substrates of S and S must always remain reverse biased

with respect to their sources, but not so much as to degrade

their “ON” resistances. In addition, at circuit start-up, and

under output short circuit conditions (V

= V+), the output

OUT

Capacitor C is charged to a voltage, V+, for the half cycle

voltage must be sensed and the substrate bias adjusted

accordingly. Failure to accomplish this would result in high

power losses and probable device latchup.

when switches S and S are closed. (Note: Switches S

and S are open during this half cycle.) During the second

half cycle of operation, switches S and S are closed, with

S and S open, thereby shifting capacitor C negatively by

This problem is eliminated in the ICL7660 and ICL7660A by a

V+ volts. Charge is then transferred from C to C such that

logic network which senses the output voltage (V

) together

OUT

the voltage on C is exactly V+, assuming ideal switches and

with the level translators, and switches the substrates of S and

no load on C . The ICL7660 approaches this ideal situation

S to the correct level to maintain necessary reverse bias.

more closely than existing non-mechanical circuits.

FN3072.7

October 10, 2005

1...3 4 567 8 9...11

中文翻译

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与7660CPA相关器件

型号	品牌	获取价格	描述	数据表
7660CPAZ	INTERSIL	获取价格	CMOS Voltage Converters
7660I	TI	获取价格	CMOS VOLTAGE CONVERTER
7660S	INTERSIL	获取价格	Super Voltage Converter
76610/1	ETC	获取价格	Pulse Transformers
76610/4	MURATA	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:1, DIP-6
76610/6	MURATA	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:1, DIP-6
766101	CANDD	获取价格	Pulse Transformers
76610-1	ETC	获取价格	Pulse Transformers
766104	CANDD	获取价格	Pulse Transformers
76610-4	ETC	获取价格	Pulse Transformers

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