XC9201DCCKL_技术文档

XC9201Series

ETR0502_004

PWM Controlled Step-Down DC/DC Controllers

■GENERAL DESCRIPTION

The XC9201 series are step-down multiple current and voltage feedback DC/DC controller ICs. Current sense, clock

frequencies and amp feedback gain can all be externally regulated.

A stable power supply is possible with output currents of up to 3.0A. With output voltage fixed internally, output voltage is

selectable in 100mV increments (semi-custom) within a 1.2V ~ 16.0V range. (±2.5%).

For output voltages outside this range, we recommend the FB version which has a 0.9V internal reference voltage. Using this

version, the required output voltage can be set-up using 2 external resistors.

Switching frequencies can also be set-up externally within a range of 100kHz~600kHz and therefore frequencies suited to

your particular application can be selected.

With the current sense function, peak currents (which flow through the driver transistor and the coil) can be controlled.

Soft-start time can be adjusted using external resistors and capacitors.

During shutdown (CE pin =L), consumption current can be reduced to as little as 0.5μA (TYP.) or less and with U.V.L.O.

(Under Voltage Lock Out) built-in, the external transistor will be automatically shut off below the regulated voltage.

■FEATURES

■APPLICATIONS

●Mobile, Cordless phones

●Palm top computers, PDAs

●Portable games

Stable Operations via Current & Voltage Multiple

Feedback

Unlimited Options for Peripheral Selection

Current Protection Circuit

Ceramic Capacitor Compatible

●Cameras, Digital cameras

●Notebook computers

Input Voltage Range

Output Voltage Range

: 2.5V ~20V

: 1.2V ~ 16V

Oscillation Frequency Range : 100kHz ~ 600kHz

Output Current

Package

: Up To 3.0A

: MSOP-8A

■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE

CHARACTERISTICS

VOUT:5.0V FOSC:330kHz

1/24

XC9201 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

PIN NUMBER

PIN NAME

FUNCTION

Driver

1

2

3

4

5

6

7

8

EXT

ISEN

Current Sense

Power Input

CE/Soft Start

Clock Input

VIN

CE / SS

CLK

CC / GAIN

VOUT / FB

VSS

Phase Compensation

Voltage Sense

Ground

MSOP-8A

(TOP VIEW)

■PRODUCT CLASSIFICATION

●Ordering Information

XC9201 ①②③④⑤⑥

DESCRIPTION

DESIGNATOR

SYMBOL

DESCRIPTION

C

D

: VOUT (Fixed Voltage Type), Soft-start externally set-up

: FB voltage, Soft-start externally set-up

Type of DC/DC

Controller

①

: e.g. VOUT=2.3V → ②=2, ③=3

FB products → ②=0, ③=9 fixed

Integer

A ~ H

② ③

Output Voltage

: Voltage above 10V

→ 10=A, 11=B, 12=C, 13=D, 14=E, 15=F, 16=H

e.g. VOUT=13.5V → ②=D, ③=5

: Adjustable

④

⑤

Oscillation Frequency

Package

A

K

R

L

: MSOP-8A

: Embossed tape, standard feed

: Embossed tape, reverse feed

⑥

Device Orientation

The standard output voltages of the XC9201C series are 2.5V, 3.3V, and 5.0V.

Voltages other than those listed are semi-custom.

2/24

XC9201

Series

■BLOCK DIAGRAM

VSS

EXT timing

Control Logic

Current Limit

Protection

EXT

VOUT

R1

R2

-

+

-

Verr

+

-

ISEN

VIN

Limiter Comp.

+

MIX

+

PWM

CC/GAIN

-

Ierr

Ramp Wave,

Internal CLK

Generator

Internal Voltage

Regulator

2.0V

to internal

circuit

+

Sampling

CE, U.V.L.O.

to internal

circuit

CLK

Chip Enable,

Soft-Start up

U.V.L.O.

CE/SS

0.9V

Vref Generator

■ABSOLUTE MAXIMUM RATINGS

Ta = 25℃

PARAMETER

EXT Pin Voltage

SYMBOL

VEXT

VlSEN

VIN

RATINGS

-0.3~VDD+0.3

-0.3~+22

-0.3~VDD+0.3

-0.3～+22

±100

UNITS

V

ISEN Pin Voltage

V

VIN Pin Voltage

V

CE/ SS Pin Voltage

CLK Pin Voltage

VCE

V

VCLK

VCC

V

CC/ GAIN Pin Voltage

VOUT/ FB Pin Voltage

EXT Pin Current

V

VOUT/FB

IEXT

V

mA

mW

℃

Power Dissipation

Operating Ambient Temperature

Storage Temperature

Pd

150

Topr

-40~+85

Tstg

-55~+125

3/24

XC9201 Series

■ELECTRICAL CHARACTERISTICS

XC9201C25AKR

Ta=25℃

CIRCUITS

①

PARAMETER

Output Voltage

SYMBOL

CONDITIONS

IOUT=300mA

MIN.

TYP.

MAX. UNITS

VOUT

2.438 2.500 2.562

V

Maximum

Operating Voltage

Minimum

VINmax

VINmin

20

-

V

①

2.200

V

Operating Voltage

U.V.L.O. Voltage

VUVLO

IDD1

IDD2

ISTB

EXT voltage = High

1.0

1.4

115

130

0.5

2.0

220

235

2.0

V

⑤

②

Supply Current 1

Supply Current 2

Stand-by Current

VIN=3.75V, CE=VIN=VOUT

VIN=20.0V, CE=VIN, VOUT=VSS

VIN=3.75V, CE=VOUT=VSS

-

μA

CLK

FOSC

RT=10.0kΩ, CT=220pF

280

330

±5

380

kHz

%

③

Oscillation Frequency

ΔFOSC

ΔVIN･FOSC

ΔFOSC

Frequency Input Stability

Frequency

VIN=2.5V～20V

-

VIN=3.75V

%

Temperature Fluctuation ΔTOPR･FOSC Topr=-40～+85℃

Maximum Duty Cycle

Minimum Duty Cycle

Current Limiter Voltage

ISEN Current

MAXDTY

MINDTY

ILIM

VOUT=VSS

100

-

%

④

⑥

VOUT=VIN

-

0

VIN pin voltage - ISEN pin voltage

VIN=3.75V, ISEN=3.75V

90

4.5

150

7.0

220

13.0

mV

μA

IISEN

CE "High" Current

CE "Low" Current

ICEH

ICEL

CE=VIN=20.0V, VOUT=0V

-0.1

0

0.1

μA

⑤

CE=0V, VIN=20.0V, VOUT=0V

CLK Oscillation start,

VOUT=0V, CE：Voltage applied

CLK Oscillation stop,

VOUT=0V, CE：Voltage applied

EXT=VIN－0.4V,

CE "High" Voltage

CE "Low" Voltage

VCEH

VCEL

0.6

-

V

⑤

④

-

0.2

40

EXT "High"

ON Resistance

EXT "Low"

REXTH

27

Ω

CE=VOUT=VIN (*1)

EXT=0.4V, CE=VIN,

VOUT=VSS (*1)

REXTL

EFFI

TSS

-

24

93

10

33

-

Ω

%

④

①

ON Resistance

Efficiency ^(*2)

Connect CSS and RSS,

Soft-start Time

5

20

ms

CE : 0V→3.75V

CC/GAIN Pin

RCCGAIN

-

400

-

kΩ

⑦

Output Impedance

Unless otherwise stated, VIN=3.75V

NOTE:

*1: On resistance = 0.4V / measurement current

*2: EFFI = {[(output voltage) x (output current)] / [(input voltage) x (input current)]} x 100

*3: The capacity range of the condenser used to set the external CLK frequency is 180 ~ 300pF

4/24

XC9201

Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9201C33AKR

Ta=25℃

CIRCUITS

①

PARAMETER

Output Voltage

SYMBOL

CONDITIONS

IOUT=300mA

MIN.

TYP.

MAX. UNITS

VOUT

3.218 3.300 3.382

V

Maximum

Operating Voltage

Minimum

VINmax

VINmin

20

-

V

①

2.200

V

Operating Voltage

U.V.L.O. Voltage

VUVLO

IDD1

IDD2

ISTB

EXT voltage = High

1.0

1.4

115

130

0.5

2.0

220

235

2.0

V

⑤

②

Supply Current 1

Supply Current 2

Stand-by Current

VIN=5.0V, CE=VIN=VOUT

VIN=20.0V, CE=VIN, VOUT=VSS

VIN=5.0V, CE=VOUT=VSS

-

μA

CLK

FOSC

RT=10.0kΩ, CT=220pF

280

330

±5

380

kHz

%

③

Oscillation Frequency

ΔFOSC

ΔVIN･FOSC

ΔFOSC

Frequency Input Stability

Frequency

VIN=2.5V～20V

-

VIN=5.0V

%

Temperature Fluctuation ΔTOPR･FOSC Topr=-40～+85℃

Maximum Duty Cycle

Minimum Duty Cycle

Current Limiter Voltage

ISEN Current

MAXDTY

MINDTY

ILIM

VOUT=VSS

100

-

%

④

⑥

⑤

VOUT=VIN

0

%

VIN pin voltage - ISEN pin voltage

VIN=5.0V, ISEN=5.0V

CE=VIN=20.0V, VOUT=0V

CE=0V, VIN=20.0V, VOUT=0V

90

150

7

220

13

0.1

mV

μA

IISEN

4.5

-0.1

CE "High" Current

CE "Low" Current

ICEH

0

ICEL

0

CLK Oscillation start,

VOUT=0V, CE：Voltage applied

CLK Oscillation stop,

VOUT=0V, CE：Voltage applied

EXT=VIN－0.4V,

CE "High" Voltage

CE "Low" Voltage

VCEH

VCEL

0.6

-

V

⑤

④

-

0.2

33

EXT "High"

ON Resistance

EXT "Low"

REXTH

24

Ω

CE=VOUT=VIN (*1)

EXT=0.4V, CE=VIN,

VOUT=Vss (*1)

REXTL

EFFI

TSS

-

22

93

10

31

-

Ω

%

④

①

ON Resistance

Efficiency ^(*2)

Connect CSS and RSS,

Soft-start Time

5

20

ms

CE : 0V→5.0V

CC/GAIN Pin

RCCGAIN

-

400

-

kΩ

⑦

Output Impedance

Unless otherwise stated, VIN=5.0V

NOTE:

*1: On resistance = 0.4V / measurement current

*2: EFFI = {[(output voltage) x (output current)] / [(input voltage) x (input current)]} x 100

*3: The capacity range of the condenser used to set the external CLK frequency is 180 ~ 300pF

5/24

XC9201 Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9201C50AKR

Ta=25℃

CIRCUITS

①

PARAMETER

Output Voltage

SYMBOL

CONDITIONS

IOUT=300mA

MIN.

TYP.

MAX. UNITS.

VOUT

4.875 5.000 5.125

V

Maximum

Operating Voltage

Minimum

VINmax

VINmin

20

-

V

①

2.200

V

Operating Voltage

U.V.L.O. Voltage

VUVLO

IDD1

IDD2

ISTB

EXT voltage = High

1.0

1.4

115

130

0.5

2.0

220

235

2.0

V

⑤

②

Supply Current 1

Supply Current 2

Stand-by Current

VIN=7.5V, CE=VIN=VOUT

VIN=20.0V, CE=VIN, VOUT=VSS

VIN=7.5V, CE=VOUT=VSS

-

μA

CLK

FOSC

RT=10.0kΩ, CT=220pF

280

330

±5

380

kHz

%

③

Oscillation Frequency

ΔFOSC

ΔVIN･FOSC

ΔFOSC

Frequency Input Stability

Frequency

VIN=2.5V～20V

-

VIN=7.5V

%

Temperature Fluctuation ΔTOPR･FOSC Topr=-40～+85℃

Maximum Duty Cycle

Minimum Duty Cycle

Current Limiter Voltage

ISEN Current

MAXDTY

MINDTY

ILIM

VOUT=VSS

100

-

%

④

⑥

⑤

VOUT=VIN

0

%

VIN pin voltage - ISEN pin voltage

VIN=7.5V, ISEN=7.5V

CE=VIN=20.0V, VOUT=0V

CE=0V, VIN=20.0V, VOUT=0V

90

150

7.0

0

220

13.0

0.1

mV

μA

IISEN

4.5

-0.1

CE "High" Current

CE "Low" Current

ICEH

ICEL

0

CLK Oscillation start,

VOUT=0V, CE：Voltage applied

CLK Oscillation stop,

VOUT =0V, CE：Voltage applied

VEXT=VIN－0.4V,

CE "High" Voltage

CE "Low" Voltage

VCEH

VCEL

0.6

-

V

⑤

④

-

0.2

29

EXT "High"

ON Resistance

EXT "Low"

REXTH

21

Ω

CE= VOUT =VIN (*1)

VEXT=0.4V, CE=VIN,

VOUT =VSS (*1)

REXTL

EFFI

Tss

-

20

93

10

27

-

Ω

%

④

①

ON Resistance

Efficiency ^(*2)

Connect Css and Rss,

Soft-start Time

5

20

ms

CE : 0V→7.5V

CC/GAIN Pin

RCCGAIN

-

400

-

kΩ

⑦

Output Impedance

Unless otherwise stated, VIN=7.5V

NOTE:

*1: On resistance = 0.4V / measurement current

*2: EFFI = {[(output voltage) x (output current)] / [(input voltage) x (input current)]} x 100

*3: The capacity range of the condenser used to set the external CLK frequency is 180 ~ 300pF

6/24

XC9201

Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9201D09AKR

Ta=25℃

CIRCUITS

①

PARAMETER

Output Voltage

SYMBOL

CONDITIONS

IOUT=300mA

MIN.

TYP. MAX. UNITS

VOUT

0.8775 0.9000 0.9225

V

Maximum

Operating Voltage

Minimum

VINmax

VINmin

20

-

V

①

2.200

V

Operating Voltage

U.V.L.O. Voltage

VUVLO

IDD1

IDD2

ISTB

EXT voltage = High

1.0

1.4

115

130

0.5

2.0

220

235

2.0

V

⑤

②

Supply Current 1

Supply Current 2

Stand-by Current

VIN=4.0V, CE=VIN=FB

VIN=20.0V, CE=VIN, FB=VSS

VIN=4.0V, CE=FB=VSS

-

μA

CLK

FOSC

RT=10.0kΩ, CT=220pF

280

330

±5

380

kHz

%

③

Oscillation Frequency

ΔFOSC

ΔVIN･FOSC

ΔFOSC

Frequency Input Stability

Frequency

VIN=2.5V～20V

-

VIN=4.0V

%

Temperature Fluctuation ΔTOPR･FOSC Topr=-40～+85℃

Maximum Duty Cycle

Minimum Duty Cycle

Current Limiter Voltage

ISEN Current

MAXDTY

MINDTY

ILIM

FB=VSS

100

-

%

④

⑥

⑤

FB=VIN

0

%

VIN pin voltage - ISEN pin voltage

VIN=4.0V, ISEN=4.0V

CE=VIN=20.0V, VOUT=0V

CE=0V, VIN=20.0V, VOUT=0V

90

150

7

220

13

0.1

mV

μA

IISEN

4.5

-0.1

CE "High" Current

CE "Low" Current

ICEH

0

ICEL

0

CLK Oscillation start,

VOUT =0V, CE：Voltage applied

CLK Oscillation stop,

VOUT=0V, CE：Voltage applied

EXT=VIN－0.4V,

CE "High" Voltage

CE "Low" Voltage

VCEH

VCEL

0.6

-

V

⑤

④

-

0.2

40

EXT "High"

ON Resistance

EXT "Low"

REXTH

27

Ω

CE=FB=VIN (*1)

REXTL

EFFI

Tss

EXT=0.4V, CE=VIN, FB=VSS (*1)

-

24

93

10

34

-

Ω

%

④

①

ON Resistance

Efficiency ^(*2)

Connect Css and Rss,

Soft-start Time

5

20

ms

CE : 0V→4.0V

CC/GAIN Pin

RCCGAIN

-

400

-

kΩ

⑦

Output Impedance

Unless otherwise stated, VIN=4.0V

NOTE:

*1: On resistance = 0.4V / measurement current

*2: EFFI = {[(output voltage) x (output current)] / [(input voltage) x (input current)]} x 100

*3: The capacity range of the condenser used to set the external CLK frequency is 180 ~ 300pF

7/24

XC9201 Series

■TYPICAL APPLICATION CIRCUITS

XC9201C33AKR

22uH

3.3V

~1.5A

PMOS

1 EXT

VSS 8

ISEN

2

VOUT

7

6

5

SD

50mΩ

VIN

CC/GAIN

CLK

3

240kΩ

470pF

4 CC/SS

1uF

7.2V

47uF (OS) or

10uF (ceramic) x 4

~30kΩ

220pF

47uF

0.22uF

PMOS

Coil

: XP132A11A1SR (TOREX)

: 22μH (CR105 SUMIDA)

Resistor

: 50mΩ for ISEN (NPR1 KOA), 30kΩ(trimmer) for CLK, 240kΩ for SS

Capacitors : 220pF (ceramic) for CLK, 470pF (ceramic) for CC/GAIN, 0.22μF (any) for SS,1μF (ceramic) for Bypass

47μF (OS) or 10μF (ceramic) x 4 for CL, 47μF (tantalum) for CIN

SD

: U3FWJ44N (TOSHIBA)

XC9201C50AKR

22uH

PMOS

SD

5.0V

~1.5A

1 EXT

VSS 8

ISEN

2

VOUT

7

6

5

50mΩ

VIN

CC/GAIN

CLK

3

240kΩ

470pF

4 CC/SS

1uF

12.0V

47uF (OS) or

+ 220uF (any)

~30kΩ

47uF

+ 220uF

220pF

0.33uF

PMOS

Coil

: XP132A11A1SR (TOREX)

: 22μH (CDRH127 SUMIDA)

Resistor

: 20mΩfor ISEN (NPR1 KOA), 30kΩ(trimmer) for CLK, 240kΩfor SS

Capacitors : 220pF (ceramic) for CLK, 470pF (ceramic) for CC/GAIN, 0.33μF (any) for SS, 1μF (ceramic) for Bypass

47μF (OS) + 220μF (any) for CL, 47μF (tantalum) + 220μF (any) for CIN

SD

: U3FWJ44N (TOSHIBA)

8/24

XC9201

Series

■TYPICAL APPLICATION CIRCUITS (Continued)

XC9201D09AKR

22uH

2.5V

~3A

39pF

PMOS

390kΩ

220kΩ

1 EXT

VSS 8

ISEN

2

FB

CC/GAIN

CLK

7

6

5

SD

20mΩ

VIN

3

240kΩ

470pF

4 CC/SS

1uF

7.2V

47uF (OS) or

+ 220uF (any)

~30kΩ

47uF

+ 220uF

220pF

0.22uF

PMOS

Coil

: XP132A11A1SR (TOREX)

: 22μH (CDRH127 SUMIDA)

Resistors : 20mΩfor ISEN (NPR1 KOA), 30kΩ(trimmer) for CLK, 240kΩfor SS, 390kΩfor Output Voltage

220kΩfor Output Voltage

Capacitors : 220pF (ceramic) for CLK, 470pF (ceramic) for CC/GAIN, 0.22μF (any) for SS, 1μF (ceramic) for Bypass

39pF (ceramic) for FB, 47μF (OS) for CL, 47μF (tantalum) + 220μF(any) for CIN

SD

: U3FWJ44N (TOSHIBA)

XC9201D09AKR

PMOS

47uH

12V

~1.5A

56pF

270kΩ

22kΩ

1 EXT

VSS 8

ISEN

2

FB

7

6

5

SD

50mΩ

VIN

CC/GAIN

CLK

3

240kΩ

470pF

4 CC/SS

1uF

20V

47uF (OS) or

+ 220uF (any)

~30kΩ

220pF

47uF

0.47uF

PMOS

Coil

Resistor

: XP132A11A1SR (TOREX)

: 47μH (CR105 SUMIDA)

: 50mΩfor ISEN (NPR1 KOA), 30kΩ(trimmer) for CLK, 240kΩ for SS, 270kΩfor Output Voltage

22kΩ(trimmer) for Output Voltage

Capacitors : 220pF (ceramic) for CLK, 470pF (ceramic) for CC/GAIN, 0.47μF (any) for SS, 1μF (ceramic) for Bypass

56pF (ceramic) for FB, 47μF (OS) + 20μF (any) for CL, 47μF (tantalum) + 220μF (any) for CIN

SD

: U3FWJ44N (TOSHIBA)

9/24

XC9201 Series

■OPERATIONAL EXPLANATION

Step-down DC/DC converter controllers of the XC9201series carry out pulse width modulation (PWM) according to the

multiple feedback signals of the output voltage and coil current.

The internal circuits consist of different blocks that operate at VIN or the stabilized power (2.0V) of the internal regulator. The

output setting voltage of type C controller and the FB pin voltage (Vref=0.9 V) of type D controller have been adjusted and set

by laser-trimming.

<Clock>

With regard to clock pulses, a capacitor and resistor connected to the CLK pin generate ramp waveforms whose top and

bottom are 0.7V and 0.15V, respectively. The frequency can be set within a range of 100 to 600 kHz externally (refer to the

"Functional Settings" section for further information). The clock pulses are processed to generate a signal used for

synchronizing internal sequence circuits.

The Verr amplifier is designed to monitor the output voltage. A fraction of the voltage applied to internal resistors R1, R2 in

the case of a type C controller, and the voltage of the FB pin in the case of a type D controller, are fed back and compared

with the reference voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the

Verr amplifier increases.

The output of the Verr amplifier enters the mixer via resistor (RVerr). This signal works as a pulse width control signal during

PWM operations. By connecting an external capacitor and resistor through the CC/GAIN pin, it is possible to set the gain

and frequency characteristics of Verr amplifier signals (refer to the "Functional Settings" section for further information).

The Ierr amplifier monitors the coil current. The potential difference between the VIN and ISEN pins is sampled at each

switching operation. Then the potential difference is amplified or held, as necessary, and input to the mixer. The Ierr

amplifier outputs a signal ensuring that the greater the potential difference between the VIN and ISEN pins, the smaller the

switching current. The gain and frequency characteristics of this amplifier are fixed internally.

The mixer modulates the signal sent from Verr by the signal from Ierr. The modulated signal enters the PWM comparator

for comparison with the saw-tooth pulses generated at the CLK pin. If the signal is greater than the saw-tooth waveforms, a

signal is sent to the output circuit to turn on the external switch.

The current flowing through the coil is monitored by the limiter comparator via the VIN and ISEN pins. The limiter comparator

outputs a signal when the potential difference between the VIN and ISEN pins reaches 150mV or more. This signal is

converted to a logic signal and handled as a DFF reset signal for the internal limiter circuit. When a reset signal is input, a

signal is output immediately at the EXT pin to turn off the MOS switch. When the limiter comparator sends a signal to

enable data acceptance, a signal to turn on the MOS switch is output at the next clock pulse. If at this time the potential

difference between the VIN and ISEN pins is large, operation is repeated to turn off the MOS switch again. DFF operates in

synchronization with the clock signal of the CLK pin.

<Soft-Start>

The soft start function is made available by attaching a capacitor and resistor to the CE/SS pin. The Vref voltage applied to

the Verr amplifier is restricted by the start-up voltage of the CE/SS pin. This ensures that the Verr amplifier operates with its

two inputs in balance, thereby preventing the ON-TIME signal from becoming stronger than necessary. Consequently, soft

start time needs to be set sufficiently longer than the time set to CLK. The start-up time of the CE/SS pin equals the time set

for soft start (refer to the "Functional Settings" section for further information).

The soft start function operates when the voltage at the CE/SS pin is between 0V to 1.55V. If the voltage at the CE/SS pin

doesn't start from 0V but from a mid level voltage when the power is switched on, the soft start function will become

ineffective and the possibilities of large inrush currents and ripple voltages occurring will be increased.

Under Voltage Lock Out (U.V.L.O.) is also provided. This function is activated to turn off the MOS switch attached to the

EXT pin when the input voltage (VIN) decreases to approximately 1.4 V or below. The purpose of this function is to keep the

external MOS switch from turning on when a voltage at which the IC operates unstably is applied. U.V.L.O. also restricts

signals during soft start so that the external MOS switch does not turn on until the internal circuitry becomes stable.

10/24

XC9201

Series

■OPERATIONAL EXPLANATION (Continued)

●Functional Settings

1. Soft-Start

CE and soft-start (SS) functions are commonly assigned to the CE/SS pin. The soft start function is effective until the

voltage at the CE pin reaches approximately 1.55V rising from 0V. Soft start time is approximated by the equation below

according to values of Vcont, RSS, and CSS.

T=-Css x Rss x ln((Vcont-1.55)/Vcont)

Example: When Css=0.1μF, Rss=470kΩ, and Vcont=5V, T= - 0.1 x 10^-6× 470 x 10³× In((5-1.55) / 5)=17.44ms.

Set the soft-start time to a value sufficiently longer than the period of a clock pulse.

> Circuit example 1: N-ch open drain

> Circuit example 2: CMOS logic (low current dissipation)

> Circuit example 3: CMOS logic (low current dissipation)

11/24

XC9201 Series

■OPERATIONAL EXPLANATION (Continued)

■

OPERATIONAL EXPLANATION (Continued)

●Functional Settings (Continued)

2. Oscillation Frequency

The oscillation frequency of the internal clock generator is approximated by the following equation according to the values of

the capacitor and resistor attached to the CLK pin. To stabilize the IC's operation, set the oscillation frequency within a

range of 100kHz to 600kHz. Select a value for Cclk within a range of 180pF to 300pF and fix the frequency based on the

value for Rclk.

f=1/ (-Cclk x Rclk x ln 0.26)

Example: When Cclk = 220pF and Rclk = 10 kΩ, f = 1/(- 220 x 10^-12x 10 x 10³x ln(0.26)) = 337.43 kHz.

3. Gain and Frequency Characteristics of the Verr Amplifier

The gain at output and frequency characteristics of the Verr amplifier are adjusted by the values of capacitor and resistor

attached to the CC/GAIN pin. It is generally recommended to attach a C_GAIN of 220 to 1,000pF without an R_GAIN. The

greater the C_GAIN value, the more stable the phase and the slower the transient response. When using the IC with

R_GAIN connected, it should be noted that if the R_GAIN resistance value is too high, abnormal oscillation may occur during

transient response time. The size of R_GAIN should be carefully determined and connected.

4. Current Limit

The current limit value is approximated by the following equation according to resistor RSEN inserted between the VIN and

ISEN pins. Double function, current FB input and current limit, is assigned to the ISEN pin. The current limit value is

approximated by the following equation according to the value for RSEN.

ILpeak_limit = 0.15 / RSEN

Example: When RSEN = 100 mΩ, ILpeak_limit = 0.15 / 0.1 = 1.5 A

Because of the feedback at the internal error amp with this IC (which is brought about as a result of the phase compensation

of the voltage generated at RSEN, which is in turn caused by current flowing through the coil when the PMOS is working.),

should the value of the RSEN resistor be too large, the feedback signal will also increase and intermittent oscillation may

occur. We therefore recommend that you carefully check the value for RSEN should you have a problem with oscillation.

During normal operations, a voltage will be generated at RSEN as a result of the coil's peak current. Please ensure that this

voltage is less than the current limit voltage, which is 90mV (min.).

For RSEN resistor's rated power, please refer to NOTES ON USE, External Components, RSENSE Resistor.

12/24

XC9201

Series

■OPERATIONAL EXPLANATION (Continued)

●Functional Settings (Continued)

5. FB Voltage and CFB

With regard to the XC9201D series, the output voltage is set by attaching externally divided resistors. The output voltage is

determined by the equation shown below according to the values of RFB1 and RFB2. In general, the sum of RFB1 and RFB2

should be 1 MΩor less.

VOUT = 0.9 x (RFB1+ RFB2) / RFB2

The value of CFB (phase compensation capacitor) is approximated by the following equation according to the values of RFB1

and fzfb. The value of fzfb should be 10 kHz, as a general rule.

CFB = 1/(2 x π x RFB1 x fzfb)

Example: When RFB1 = 455 kΩ and RFB2 = 100 kΩ : VOUT = 0.9 x (455 k + 100 k)/100 k = 4.995 V

: CFB= 1/(2 x π x 455 k x 10 k) = 34.98 pF.

■APPLICATION NOTES

1. The XC9201 series are designed for use with an output ceramic capacitor. If, however, the potential difference between

input and output is too large, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation

could occur on the output side. If the input-output potential difference is large, connect an electrolytic capacitor in parallel

to compensate for insufficient capacitance.

2. The EXT pin of the XC9201 series is designed to minimize the through current that occurs in the internal circuitry.

However, the gate drive of external PMOS has a low impedance for the sake of speed. Therefore, if the input voltage is

high and the bypass capacitor is attached away from the IC, the charge/discharge current to the external PMOS may lead

to unstable operations due to switching operation of the EXT pin.

As a solution to this problem, place the bypass capacitor as close to the IC as possible, so that voltage variations at the VIN

and VSS pins caused by switching are minimized. If this is not effective, insert a resistor of several to several tens of

ohms between the EXT pin and PMOS gate. Remember that the insertion of a resistor slows down the switching speed

and may result in reduced efficiency.

3. A PNP transistor can be used in place of PMOS. If using a PNP transistor, insert a resistor (RB) and capacitor (CB)

between the EXT pin and the base of the PNP transistor in order to limit the base current without slowing the switching

speed. Adjust RB in a range of 500Ω to 1kΩ according to the load and hFE of the transistor. Use a ceramic capacitor

for CB, complying with CB ≦ 1/ ( 2 x π x RB x Fosc x 0.7), as a rule.

4. This IC incorporates a limit comparator to monitor the voltage produces across the RSEN resistor at the current peak of the

coil. It functions as a limiter when, for example, the output is short-circuited. In such a case, the limit comparator

senses that the voltage across the RSEN resistor has reached a current-limiting voltage (typically 150mV) and outputs a

signal to turn off the external transistor. After sensing a current-limit voltage, the limit comparator typically takes 200nsec

(TYP.) before it turns off the external resistor. During this time, the voltage across the RSEN resistor can exceed the

current-limit voltage, especially when the difference between the input voltage and the output voltage is large and the coil

inductance is small. Therefore, exercise great care in selecting absolute maximum ratings of the external transistor, coil,

and Schottky diode.

5. If the difference between the input voltage and the output voltage is large or small, the switching ON time or OFF time of

this IC becomes short and actual operation can be critically influenced by values of peripheral components 'inductance of

coil, resistance of CLK connection, capacitance of capacitor, etc.) Before use, it is recommended to evaluate this IC

thoroughly with an actual unit.

13/24

XC9201 Series

■APPLICATION NOTES (Continued)

6. The series are designed to operate in PWM control. However, there is the possibility that some cycles may be skipped

depending on the operational conditions. Please use the following output voltage vs. input voltage characteristics for

reference. Verification using actual devices is recommended. It should be noted that when CCLK is connected to VIN,

the influence of noise is lessened and the input and output voltage ranges as well as the output current range in which

stable operation is possible is widened. It is recommended that you refer to the "Oscillation Frequency" Functional

Settings for setting up the oscillation frequency. If using a MOSFET, please pay particular attention to the gate

breakdown voltage. In the following graphs, because the gate breakdown voltage of the MOSFET used was 20V, input

voltages over 16V were not measured. Please use a bipolar transistor in applications where higher input voltages are

required.

●Operational Control Characteristics

○XC9201D09AKR

C^CLKVIN Connection

SD: D1FH3

L: CDRH127 / LD-220 (22uH)

C^IN: TMK432BJ106KM (25V / 10uF) x 3

C^L: JMK325BJ226MM (6.3V / 22uF) x 3

C^DD: UMK325BJ105KH (50V / 1uF)

R^SEN: 50mΩ

R^CLK: 11kΩ (300kHz), 6.8kΩ (500kHz)

C^CLK: 220pF

C^CC: 330pF

L

VIN

VOUT

RSENSE

Tr

IC

CFB

RFB1

RFB2

FB

GAIN

CLK

EX T

ISEN

VIN

CL

CDD

SD

RSS

CSS

CIN

RCLK

CE/SS

R^CC: 0Ω

VSS

R^B(2SA1887): 7kΩ (300kHz), 16kΩ (500kHz)

R^SS: 1MΩ

GND

CCLK

CCC

C^SS: 0.1uF

R^FB1: 330kΩ

CCLK VIN Connection Circuit

C^FB: 47pF

R^FB2: 0.9 x RFB1 / (VOUT-0.9V)

14/24

XC9201

Series

■APPLICATION NOTES (Continued)

●Operational Control Characteristics (Continued)

○XC9201D09AKR CCLK GND Connection

SD: D1FH3

L: CDRH127 / LD-220 (22uH)

C^IN: TMK432BJ106KM (25V / 10uF) x 3

C^L: JMK325BJ226MM (6.3V / 22uF) x 3

C^DD: UMK325BJ105KH (50V / 1uF)

R^SEN: 50mΩ

R^CLK: 11kΩ (300kHz), 6.8kΩ (500kHz)

C^CLK: 220pF

L

VIN

VOUT

RSE NSE

Tr

CFB

IC

RFB1

EXT

ISEN

FB

GAIN

CLK

CL

C^CC: 330pF

R^CC: 0Ω

R^B(2SA1887): 7kΩ (300kHz), 16kΩ (500kHz)

R^SS: 1MΩ

VIN

SD

RSS

C SS

CIN

CDD

CCLK

RFB2

CE/SS

VSS

GND

C^SS: 0.1uF

R^FB1: 330kΩ

C^FB: 47pF

C CC

RCLK

CCLK GND Connecton Circuit

R^FB2: 0.9V x RFB1 / (VOUT-0.9V)

15/24

XC9201 Series

■INSTRUCTION ON PATTERN LAYOUT

①In order to stabilize VDD's voltage level, we recommend that a by-pass condenser (CDD) be connected as close as

possible to the VIN & VSS pins.

②In order to stabilize the GND voltage level which can fluctuate as a result of switching, we suggest that C_CLK's,

R_CLK's & C_GAIN's GND be separated from Power GND and connected as close as possible to the VSS pin (by-pass

condenser, CDD). Please use a multi layer board and check the wiring carefully.

Pattern Layout Examples

XC9201 Series (D Series)

2 layer Evaluation Board

8

7

6

5

8

7

6

5

16/24

XC9201

Series

■INSTRUCTION ON PATTERN LAYOUT (Continued)

1 layer Evaluation Board

8

7

6

5

■NOTES ON USE

Ensure that the absolute maximum ratings of the external components and the XC9201 DC/DC IC itself are not exceeded.

We recommend that sufficient counter measures are put in place to eliminate the heat that may be generated by the

external P-ch MOSFET as a result of switching losses.

Try to use a P-ch MOSFET with as small a gate capacitance as possible in order to avoid overly large output spike voltages

that may occur (such spikes occur in proportion to gate capacitance). The performance of the XC9201 DC/DC converter

is greatly influenced by not only its own characteristics, but also by those of the external components it is used with. We

recommend that you refer to the specifications of each component to be used and take sufficient care when selecting

components.

Wire external components as close to the IC as possible and use thick, short connecting wires to reduce wiring impedance.

In particular, minimize the distance between the by-pass capacitor and the IC.

Make sure that the GND wiring is as strong as possible as variations in ground potential caused by ground current at the

time of switching may result in unstable operation of the IC. Specifically, strengthen the ground wiring in the proximity of

the VSS pin.

●External Components

RSENSE Resistor

A low value resistor is defined as a resistor with a 10Ω value or lower. For RSENSE, the XC9201 series uses a resistor

with a value of either 50mΩor 100mΩ. Although resistors for RSENSE are classified as low resistance chip resistors or

current limit resistors (which may give the impression that the RSENSE resistor is expensive), it is not necessary to use

expensive low resistance chip resistors as general purpose chip resistors with values of 50mΩ or 100mΩ will do the job

just as well.

When choosing the RSENSE resistor, it is important to confirm the resistor's power consumption, which can be done using

the following equation:

W (Power Consumption) =I (Current) x V (Voltage)

=I (Current) x I (Current) x R (Resistance)

It is recommended that a resistor which has a power rating of more than 3 times the power consumption of RSENSE be

selected (refer to the example given below):

(ex.) RSENSE = 100mΩ, I = 1A

I = 1A

RSENSE = 100mΩ(0.1Ω)

Power supply W = 1 x 1 x 0.1 = 0.1 [W]

0.5W, 100mΩ resistor should be used

17/24

XC9201 Series

■TEST CIRCUITS

Circuit ① (VOUT Type)

Circuit ① (FB Type)

Circuit ②

Circuit ③

Circuit ④

Circuit ⑤

Circuit ⑥

Circuit ⑦

18/24

XC9201

Series

■TYPICAL PERFORMANCE CHARACTERISTICS

XC9201D09AKR

(1) Output Voltage vs. Output Current

19/24

XC9201 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(2) Efficiency vs. Output Current

20/24

XC9201

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(3) Ripple Voltage vs. Output Current

*Note: If the input and output voltage differential is large or small, the time of ON and OFF switching will be shorten.

This gives external components such as inductance value of coil, connecting a resistor to CLK, capacitor, will critically influence the

actual operation.

21/24

XC9201 Series

■PACKAGING INFORMATION

●MSOP-8A

22/24

XC9201

Series

■MARKING RULE

●MSOP-8A

①Represents product series

MARK

PRODUCT SERIES

1

XC9201xxxAKx

②Represents product type, DC/DC controller

MARK

TYPE

PRODUCT SERIES

XC9201CxxAKx

XC9201C09AKx

C

D

VOUT, CE PIN

FB, CE PIN

③Represents integral number of output voltage or FB type

MARK

VOLTAGE

1.x

PRODUCT SERIES

XC9201C1xAKx

XC9201C2xAKx

XC9201C3xAKx

XC9201C4xAKx

XC9201C5xAKx

XC9201C6xAKx

XC9201C7xAKx

XC9201C8xAKx

XC9201C9xAKx

XC9201D09AKx

XC9201CAxAKx

XC9201CxAKx

XC9201CCxAKx

XC9201CDxAKx

XC9201CExAKx

XC9201CFxAKx

XC9201CHxAKx

MSOP-8A

(TOP VIEW)

1

2

2.x

3

3.x

4

4.x

5

5.x

6

6.x

7

7.x

8

8.x

9

9.x

0

FB products

10.x

11.x

12.x

13.x

14.x

15.x

16.x

A

B

C

D

E

F

H

④Represents decimal number of output voltage

MARK

VOLTAGE

x.0

PRODUCT SERIES

XC9201Cx0AKx

XC9201Cx3AKx

XC9201D09AKx

0

3

9

x.3

FB products

⑤Represents oscillation frequency's control type

MARK

A

VOLTAGE

PRODUCT SERIES

XC9201xxxxAKx

Adjustable Frequency

⑥⑦Represents production lot number

0 to 9,A to Z repeated (G, I, J, O, Q, W excepted).

Note: No character inversion used.

23/24

XC9201 Series

1. The products and product specifications contained herein are subject to change without

notice to improve performance characteristics. Consult us, or our representatives

before use, to confirm that the information in this catalog is up to date.

2. We assume no responsibility for any infringement of patents, patent rights, or other

rights arising from the use of any information and circuitry in this catalog.

3. Please ensure suitable shipping controls (including fail-safe designs and aging

protection) are in force for equipment employing products listed in this catalog.

4. The products in this catalog are not developed, designed, or approved for use with such

equipment whose failure of malfunction can be reasonably expected to directly

endanger the life of, or cause significant injury to, the user.

(e.g. Atomic energy; aerospace; transport; combustion and associated safety

equipment thereof.)

5. Please use the products listed in this catalog within the specified ranges.

Should you wish to use the products under conditions exceeding the specifications,

please consult us or our representatives.

6. We assume no responsibility for damage or loss due to abnormal use.

prior permission of Torex Semiconductor Ltd.

24/24


型号：	XC9201DCCKL
厂家：	Torex Semiconductor
描述：	PWM Controlled Step-Down DC/DC Controllers PWM控制的降压型DC / DC控制器控制器
文件：	总24页 (文件大小：1213K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

XC9201DCCKL [TOREX]

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