CS5112EDWFR24 datasheet(9/10 Pages) CHERRY

Il numero della parte	CS5112EDWFR24

Spiegazioni elettronici	1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE

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Produttore elettronici	CHERRY [Cherry Semiconductor Corporation]

Homepage	http://www.cherrycorp.com/

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9

Application Notes: continued

25

0

05

VREG (V)

50

75

100

10

20

25

15

30

QJA = 35°C/W

VIN = 14V

Max Total Power = 1.86W

25

0

05

VREG (V)

50

75

100

10

20

25

15

30

QJA = 55°C/W

VIN = 14V

Max Total Power = 1.18W

Linear Regulator Output Current vs. Input Voltage

* Subjecting the CS5112 to these conditions will exceed the maximum total power that the part can handle, thereby forcing it into thermal limit.

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/(¹R4C2),

(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 = 64.9kW

100

mF

ESR<8

W

0.1

mF

CCOMP

0.33

mF

L=33

mH

VIN

COUT

88

mF

(2)

100k

W

946

W

7.5k

W

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 = 1/2

pR4C1

+G

B

A

C

fP = 1/

p RLoadCOUT

error amplifier gain

fCO

fz = 1/2

p ESR COUT

fP = 1/

pR4C2

-20dB/dec

-G

modulator gain + feedback resistor divider attenuation

Worst Case Switcher

Linear Power

Power Available

VREG

VIN

ILIN

Dissipation

(

QJA = 55¡C/W)

(

QJA = 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

*

Figure 12: The shaded area shows the safe operating area of the CS5112 as a function of ILIN, VREG, and QJA. Refer to the table below for typical

loads and voltages.

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