CS5111YDWFR24 datasheet(9/10 Pages) CHERRY

部件名	CS5111YDWFR24

功能描述	1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE

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制造商	CHERRY [Cherry Semiconductor Corporation]

网页	http://www.cherrycorp.com/

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9 / 10 page

Figure 10. Bode plot of error amplifier (OTA) gain and modulator gain

added to the feedback resistor divider attenuation.

A pole at point C:

fp = 1/(πR4C2),

(8g)

offsets the zero set by the ESR of the output capacitors.

An alternative scheme uses a single capacitor as shown in

Figure 11, to roll the gain off at a relatively low frequency.

Figure 11. A typical application diagram with external components con-

figured in a boost topology.

Step 9

Finally the watchdog timer period and Power on Reset

time is determined by:

tDelay = 1.353 × CDelayRBIAS.

(9)

VIN

NC

VSW

Gnd

VFB1

VFB2

SELECT

COMP

VREG

VLIN

IBIAS

Gnd

CDelay

WDI

COSC

RBIAS = 64.9kΩ

100µF

ESR<8Ω

0.1µF

CCOMP

0.33µF

L=33µH

VIN

COUT

88µF

(2)

100kΩ

946Ω

7.5kΩ

R1

R2

R3

Cdelay

390pF

COSC

RESET

ENABLE

(1)

VOUT = 18V, Select > 2V

VOUT = 16V, Select < 0.8V

MICROPROCESSOR

5V

Pole due to error amplifier

output impedance and C1

G

0

fz = 1/2πR4C1

+G

B

A

C

fP = 1/π RLoadCOUT

error amplifier gain

fCO

fz = 1/2π ESR COUT

fP = 1/πR4C2

-20dB/dec

-G

modulator gain + feedback resistor divider attenuation

9

Application Notes: continued

25

0

05

VREG (V)

50

75

100

10

20

25

15

30

ΘJA = 35°C/W

VIN = 14V

Max Total Power = 1.86W

25

0

05

VREG (V)

50

75

100

10

20

25

15

30

ΘJA = 55°C/W

VIN = 14V

Max Total Power = 1.18W

Worst Case Switcher

Linear Power

Power Available

VREG

VIN

ILIN

Dissipation

(ΘJA = 55°C/W)

(ΘJA = 35°C/W)

(V)

(mA)

(W)

20

14

25

0.44

0.74

1.42

20

14

50

0.83

0.35

1.03

20

14

75

1.22

*

0.64

20

14

100

1.60

*

0.26

25

14

25

0.60

0.58

1.26

25

14

50

1.11

0.07

0.75

25

14

75

1.62

*

0.24

25

14

100

2.14

*

Linear Regulator Output Current vs. Input Voltage

Figure 12: The shaded area shows the safe operating area of the CS5111 as a function of ILIN, VREG, and ΘJA. Refer to the table below for typical

loads and voltages.

* Subjecting the CS5111 to these conditions will exceed the maximum total power that the part can handle, thereby forcing it into thermal limit.

类似零件编号 - CS5111YDWFR24

制造商	部件名	数据表	功能描述
ON Semiconductor	CS5111YDWFR24	112Kb / 16P	Switching Regulator January, 2001 ??Rev. 9

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