MB3778PFV-XXX [FUJITSU]

Dual Switching Controller, 0.075A, 500kHz Switching Freq-Max, BIPolar, PDSO16, 4.40 X 5 MM, 1.45 MM HEIGHT, 0.65 MM PITCH, PLASTIC, SSOP-16;

MB3778PFV-XXX


型号：	MB3778PFV-XXX
厂家：	FUJITSU
描述：	Dual Switching Controller, 0.075A, 500kHz Switching Freq-Max, BIPolar, PDSO16, 4.40 X 5 MM, 1.45 MM HEIGHT, 0.65 MM PITCH, PLASTIC, SSOP-16 稳压器开关控制器
文件：	总29页 (文件大小：267K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FUJITSU SEMICONDUCTOR

DATA SHEET

DS04-27203-6E

ASSP

Switching Regulator Controller

MB3778

■ DESCRIPTION

The MB3778 is a dual switching regulator control IC. It has a two-channel basic circuit that controls PWM system

switching regulator power. Complete synchronization is achieved by using the same oscillator output wave.

This IC can accept any two of the following types of output voltage: step-down, step-up, or voltage inversion

(inverting voltage can be output to only one circuit). The MB3778’s low power consumption makes it ideal for use

in portable equipment.

■ FEATURES

• Wide input voltage range : 3.6 V to 18 V

• Low current consumption : 1.7 mA typ. operation, 10 µA max. stand-by

• Wide oscillation frequency range:1 kHz to 500 kHz

• Built-in timer latch short-circuit protection circuit

• Built-in under-voltage lockout circuit

• Built-in 2.46 V reference voltage circuit : 1.23 V output can be obtained from R^Tterminal

• Variable dead-time provides control over total range

• Built-in stand-by function: power on/off function

■ PACKAGES

16-pin, Plastic DIP

16-pin, Plastic SSOP

16-pin, Plastic SOP

v

(DIP-16P-M04)

(FPT-16P-M05)

(FPT-16P-M06)

MB3778

■ PIN ASSIGNMENT

(TOP VIEW)

CT

RT

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VREF

SCP

CTL

+IN1

−IN1

−IN2

FB2

FB1

DTC1

OUT1

E/GND

DTC2

OUT2

VCC

(DIP-16P-M04)

(FPT-16P-M05)

(FPT-16P-M06)

2

MB3778

■ PIN DESCRIPTION

No.

Pin

Function

Oscillator timing capacitor terminal (150 pF to 15,000 pF) .

Oscillator timing resistor terminal (5.1 kΩ to 100 kΩ) .

1

C^T

2

R^T

VREF × 1/2 voltage is also available at this pin for error amplifier reference input.

3

4

+IN1 Error amplifier 1 non-inverted input terminal.

−IN1 Error amplifier 1 inverted input terminal.

Error amplifier 1 output terminal.

5

6

7

FB1

A resistor and a capacitor are connected between this terminal and the −IN1 terminal to ad-

just gain and frequency.

OUT1 dead-time control terminal.

DTC1 Dead-time control is adjusted by an external resistive divider connected to the V^REFpin.

A capacitor connected between this terminal and GND enables soft-start operation.

Open collector output terminal.

OUT1 Output transistor has common ground independent of signal ground.

This output can source or sink up to 50 mA.

8

9

E/GND Ground terminal.

V^CC

Power supply terminal (3.6 to 18 V)

Open collector output terminal.

10

11

OUT2 Output transistor has common ground independent of signal ground.

This output can source or sink up to 50 mA.

Sets the dead-time of OUT2.

DTC2

The use of this terminal is the same as that of DTC1.

Error amplifier 2 output terminal.

Sets the gain and adjusts the frequency when a resistor and a capacitor are connected be-

12

FB2

tween this terminal and the −IN2 terminal.

Voltage of V^REF× 1/2 voltage is internally connected to the non-inverted input of error amplifier

2. Uses error amplifier 2 for positive voltage output.

13

14

−IN2 Error amplifier 2 inverted input terminal.

Power control terminal.

The IC is set in the stand-by state when this terminal is set “Low.”

Current consumption is 10 µA or lower in the stand-by state.

CTL

The input can be driven by TTL or CMOS.

The time constant setting capacitor connection terminal of the timer latch short-circuit protec-

tion circuit.

15

16

SCP

Connects a capacitor between this pin and GND.

For details, see “How to set time constant for timer latch short-circuit protection circuit”.

2.46 V reference voltage output terminal which can be obtained up to 1 mA.

This pin is used to set the reference input and idle period of the error amplifiers.

V^REF

3

MB3778

■ BLOCK DIAGRAM

9

14

1

2

1.23 V

2.46 V

1.9 V

1.3 V

Reference

16

Power

Supply

Control

Triangular

Oscillator

Voltage

OUT1

OUT2

7

−

+

+

2.46 V

Error Amp 1

PWM Comp1

PWM Comp2

S.C.P. Comp

+

−

−

+

+

3

4

−

−

10

+

5

2.1 V

12

Error Amp 2

−

13

15

2.46 V

+

1 µA

1.23 V

R S

R

Latch

U. V. L. O.

−

−

+

8

D.T.C. Comp.

1.1 V

6

11

4

MB3778

■ OPERATION DESCRIPTION

1. Reference voltage circuit

The reference voltage circuit generates a temperature-compensated reference voltage (=: 2.46 V) from VCC (pin

9) . The reference voltage is used as an operation power supply for internal circuit.

The reference is obtained from the VREF terminal (pin 16).

2. Triangular wave oscillator

Triangular waveforms can be generated at any frequency by connecting a timing capacitor and resistor to the

CT terminal (pin 1) and to the RT terminal (pin 2) .

The amplitude of this waveform is from 1.3 V to 1.9 V. These waveforms are connected to the non-inverting

inputs of the PWM comparator and can be output through the CT terminal.

3. Error amplifiers (Error Amp.)

The error amplifier detects the output voltage of the switching regulator and outputs PWM control signals.The

in-phase input voltage range is from 1.05 V to 1.45 V.The reference voltage obtained by dividing the reference

voltage output (recommended value : V^REF/2) or the RT terminal voltage (1.23 V) is supplied to the non-inverting

input. The VREF/2 voltage is internally connected to non-inverting input of the other error amplifier.

Any loop gain can be chosen by connecting the feedback resistor and capacitor to the inverting input terminal

from the output terminal of the error amplifier.Stable phase compensation is possible.

4. Timer latch short circuit protection circuit

This circuit detects the output levels of each error amplifier. If the output level of one or both of the error amplifiers

is 2.1 V or higher, the timer circuit begins charging the externally connected protection enable-capacitor.

If the output level of the error amplifier does not drop below the normal voltage range before the capacitor voltage

reaches the transistor base-emitter voltage, VBE(=: 0.65 V), the latch circuit turns the output drive transistor off

and sets the idle period to 100%.

5. Under voltage lock-out circuit

The transition state at power-on or a momentary drops in supply voltage may cause the control IC to malfunction,

which may adversely affect or even destroy the system. The under voltage lockout circuit monitors VCC with

reference to the internal reference voltage and resets the latch circuit to turn the output drive transistor off. The

idle period is set to 100%. It also pulls the SCP terminal (pin 15) “Low”.

6. PWM comparator unit

Each PWM comparator has one inverting input and two non-inverting inputs. This voltage-to-pulse-width con-

verter controls the turning on time of the output pulse according to the input voltage.

The PWM comparator turns the output drive transistor on while triangular waveforms from the oscillator are

lower than the error amplifier output and the DTC terminal voltage.

7. Output drive transistor

The output drive transistors have open collector outputs with common source supply and common grounds

independent of VCC and signal ground. The output drive transistors for switching can sink or source up to 50 mA.

8. Power control unit

The power control terminal (pin 14) controls power on/off modes(the power supply current in stand-by mode is

10 µA or lower).

5

MB3778

■ ABSOLUTE MAXIMUM RATINGS (See NOTE)

(Ta = 25 °C)

Rating

Parameter

Symbol

Condition

Unit

Min.

Max.

20

Power Supply Voltage

Error Amp. Input Voltage

Control Input Voltage

V^CC

VIN

V

V

−0.3

−0.3

+10

+20

20

V^CTL

V^OUT

IOUT

V

Collector Output Voltage

Collector Output Current

V

75

mA

mW

mW

mW

°C

°C

Ta ≤ +25 °C (SOP)

Ta ≤ +25 °C (SSOP)

Ta ≤ +25 °C (DIP)

620*¹

444*²

1000

+85

+125

Power Dissipation

P^D

Operating Temperature

Storage Temperature

Top

−30

−55

Tstg

*1: The packages are mounted on the epoxy board (4 cm × 4 cm)

*2: The packages are mounted on the epoxy board (10 cm × 10 cm)

WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,

temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.

■ RECOMMENDED OPERATING CONDITIONS

Value

Parameter

Symbol

Unit

Min.

3.6

1.05

0

Typ.

Max.

18

Power Supply Voltage

Error Amp. Input Voltage

Control Input Voltage

Collector Output Voltage

Collector Output Current

Timing Capacitor

V^CC

VIN

6.0

V

V

1.45

18

V^CTL

V^OUT

IOUT

CT

V

18

V

0.3

150

5.1

1

50

mA

pF

kΩ

kHz

°C

15000

100

500

85

Timing Resistor

R^T

Oscillator Frequency

Operating Temperature

fOSC

Top

−30

25

WARNING: The recommended operating conditions are required in order to ensure the normal operation of the

semiconductor device. All of the device’s electrical characteristics are warranted when the device is

operated within these ranges.

Always use semiconductor devices within their recommended operating condition ranges. Operation

outside these ranges may adversely affect reliability and could result in device failure.

No warranty is made with respect to uses, operating conditions, or combinations not represented on

the data sheet. Users considering application outside the listed conditions are advised to contact their

FUJITSU representatives beforehand.

6

MB3778

■ ELECTRICAL CHARACTERISTICS

(Ta = 25 °C, VCC = 6 V)

Value

Parameter

Reference Block

Symbol

Condition

Unit

Min.

Typ.

Max.

Output Voltage

V^REF

V^RTC

Line

Load

I^OS

IOR = −1 mA

2.41

2.46

±0.2

2

2.51

2

V

Output Temp. Stability

Input Stability

Ta = −30 °C to +85 °C

V^CC= 3.6 V to 18 V

IOR = −0.1 mA to −1 mA

VREF = 2 V

−2

%

10

7.5

−3

mV

mV

mA

Load Stability

1

Short Circuit Output Current

−30

−10

Under Voltage Lockout Protection Block

V^tH

IOR = −0.1 mA

IOR = −0.1 mA

IOR = −0.1 mA

2.72

2.60

120

1.9

V

V

Threshold Voltage

VtL

Hysteresis Width

VHYS

VR

80

mV

V

Reset Voltage (V^CC)

1.5

Protection Circuit Block (S.C.P.)

Input Thresold Voltage

Input Stand by Voltage

Input Latch Voltage

V^tPC

V^STB

VIN

0.60

−1.4

160

−4

0.65

50

0.70

100

100

−0.6

V

No pull up

No pull up

mV

mV

µA

V

50

Input Source Current

I^bpc

−1.0

2.1

Comparator Threshold Voltage

Triangular Waveform Oscillator Block

Oscillator Frequency

VtC

Pin 5, Pin 12

f^OSC

fdev

fdV

CT = 330 pF, RT = 15 kΩ

CT = 330 pF, RT = 15 kΩ

VCC = 3.6 V to 18 V

200

±5

240

kHz

%

Frequency Deviation

Frequency Stability (VCC)

Frequency Stability (Ta)

Dead-Time Control Block (D.T.C.)

Input Bias Current

±1

%

f^dT

Ta = −30 °C to +85 °C

+4

1

%

I^bdt

Idt

0.2

µA

µA

V

Latch Mode Sink Current

Latch Input Voltage

Vdt = 2.5 V

150

500

V^dt

Idt = 100 µA

0.3

7

MB3778

■ ELECTRICAL CHARACTERISTICS (Continued)

(Ta = 25 °C, VCC = 6 V)

Value

Parameter

Error Amp. Block

Symbol

Condition

Unit

Min.

Typ.

Max.

Input Offset Voltage

Input Offset Current

Input Bias Current

V^IO

I^IO

I^B

VO = 1.6 V

−6

6

mV

nA

nA

VO = 1.6 V

VO = 1.6 V

−100

−500

100

−100

Common Mode Input Voltage

Range

VICR

VCC = 3.6 V to 18 V

1.05

70

1.45

V

Voltage Gain

A^V

BW

RNF = 200 kΩ

AV = 0 dB

80

1.0

80

dB

MHz

dB

Frequency Band Width

Common Mode Rejection Ratio

CMRR

60

VREF

− 0.3

V^OM+

V

Max. Output Voltage Width

V^OM−

I^OM+

IOM−

0.7

1.0

−60

0.9

V

Output Sink Current

VO = 1.6

VO = 1.6

mA

µA

Output Source Current

PWM Comparator Block

V^t100

Vt0

Duty Cycle = 100%

Duty Cycle = 0%

1.9

1.3

65

2.25

75

V

V

Input Threshold Voltage

(f^OSC= 10 kHz)

1.05

55

On duty Cycle

D^tr

Vdt = VREF/1.45

%

Input Sink Current

Input Source Current

Control Block

IIN+

IIN−

Pin 5, Pin 12 = 1.6 V

Pin 5, Pin 12 = 1.6 V

1.0

−60

mA

µA

Input Off Condition

Input On Condition

Control Terminal Current

Output Block

V^OFF

VON

ICTL

0.7

V

V

2.1

VCTL = 10 V

200

1.1

400

µA

Output Leak Current

Output Saturation Voltage

All Device Block

Stand-by Current

Leak

VO = 18 V

10

µA

VSAT

IO = 50 mA

1.4

V

ICCS

VCTL = 0 V

10

µA

VCTL = VCC, No Output

Load

Average Supply Current

I^CCa

1.7

2.4

mA

8

MB3778

■ TEST CIRCUIT

VCC = 6 V

CTL

INPUT

TEST

SW

4.7 kΩ

CPE

OUTPUT 1

OUTPUT 2

4.7 kΩ

16 15 14 13 12 11 10

MB3778

9

8

1

2

3

4

5

6

7

330 pF

15 kΩ

TEST

INPUT

■ TIMING CHART (Internal Waveform)

Triangular waveform oscillator output

Short circuit protection

comparator Reference

input

Dead Time, PWM input

voltage

2.1 V

1.9 V

1.6 V

1.3 V

Error Amp. output

"High"

"Low"

"High"

"Low"

0.65 V

0.05 V

"High"

"Low"

PWM comparator

output

DEAD TIME 100%

Output Transistor

collector waveform

S.C.P. Terminal

waveform

tPE

Short circuit protection

comparator output

Power “ON”

Power “OFF”

2.1 V

Control Terminal

voltage

(VCTL : Min. Value)

0 V

Power supply voltage

3.6 V

(VCC : Min. Value)

Protection Enable Time tPE 0.6 × 10⁶× CPE (µs)

0 V

9

MB3778

■ APPLICATION CIRCUIT

• Chopper Type Step Down/inverting

VIN (10 V)

CTL

820 pF

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

8.2 kΩ

0.1 µF

56 µH

1.8 kΩ

4.7 kΩ

1.8 kΩ

150

kΩ

4.7 kΩ

MB3778

150

kΩ

0.033

0.033

µF

µF

220 µF

10 kΩ

4.7 kΩ

−

+

10 kΩ

−

+

+

−

1 µF

1 µF

5.6 kΩ

2.4 kΩ

330 Ω

330 Ω

330 Ω

330 Ω

120 µH

120 µH

−

+

−

+

9.1 kΩ

220 µF

220 µF

−

+

VO

( 5 V)

V^O

−5 V)

GND

(

10

MB3778

• Chopper Type Step Up/Inverting

VIN (5 V)

CTL

820 pF

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

8.2 kΩ

0.1 µF

56 µH

1.8 kΩ

4.7 kΩ

1.8 kΩ

150

kΩ

4.7 kΩ

MB3778

150

kΩ

0.033

0.033

µF

µF

220 µF

10 kΩ

4.7 kΩ

−

+

10 kΩ

−

+

+

−

1 µF

1 µF

16 kΩ

4.7 kΩ

330 Ω

3.9 kΩ

100 Ω

330 Ω

120 µH

120 µH

220 µF

220 µF

−

+

+

−

9.1 kΩ

+

−

VO

VO

GND

(

5 V)

(

−5 V)

11

MB3778

• Multi Output Type (Apply Transformer)

VIN (10 V)

CTL

820 pF

1

2

3

4

5

6

7

8

16

0.1 µF

8.2 kΩ

15

14

13

12

11

10

9

56 µH

1.8 kΩ

MB3778

220 µF

150

kΩ

0.033

µF

−

+

10 kΩ

1.8 kΩ

220 Ω

4.7 kΩ

1000 pF

5.6 kΩ

−

+

− +

−

+

− +

220 µF

220 µF

220 µF

220 µF

+

+

−

−

VO1

( −5 V)

VO1

VO2

VO2

GND

(

12 V)

(

5 V)

(

−12 V)

12

MB3778

■ HOW TO SET THE OUTPUT VOLTAGE

The output voltage is set using the connections shown in “Connection of error Amp. Output Voltage V0 ≥ 0” and

“Connection of Error Amp. Output Voltage V0 < 0”.

The error amplifier power is supplied by the reference voltage circuit as is that of the other internal circuits. The

common mode input voltage range is from 1.05 V to 1.45 V.

Set 1.23 V (VREF/2) as the reference input voltage that is connected to either inverting or non-inverting input

terminals.

• Connection of Error Amp. Output Voltage V⁰≥ 0

VREF

+

VO

VREF

R

R

R1

+

VO

(R1 + R2)

=

2 × R2

+

−

PIN 5 or PIN 12

R2

RNF

• Connection of Error Amp. Output Voltage V⁰< 0

VREF

VREF

−

VO

(R1 + R2) + VREF

= −

2 × R1

R

R

R1

+

−

PIN 5

R2

RNF

−

VO

13

MB3778

■ HOW TO SET TIME CONSTANT FOR TIMER LATCH SHORT-CIRCUIT

PROTECTION CIRCUIT

Below Figure shows the configuration of the protection latch circuit.

Each error amplifier output is connected to the inverting inputs of the short-circuit protection comparator and is

always compared with the reference voltage (2.1 V) connected to the non-inverting input.

When the load condition of the switching regulator is stable, the error amplifier has no output fluctuation. Thus,

short-circuitprotectioncontrolisalsokeptinbalance, andtheSCPterminal(pin15)voltageisheldatabout50mV.

If the load changes drastically due to a load short-circuit and if the inverting inputs of the short-circuit protection

comparator go above 2.1 V, the short-circuit protection comparator output goes “Low” to turn off transistor Q1.

The SCP terminal voltage is discharged, and then the short-circuit protection comparator charges the protection

enable capacitor CPE according to the following formula :

V^PE= 50 mV + tPE × 10 ^{− 6}/ CPE

0.65 = 50 mV + tPE × 10^{− 6}/ CPE

CPE = tPE / 0.6 (µF)

When the protection enable capacitor is charged to about 0.65 V, the protection latch is set to enable the under

voltage lockout circuit and the output drive transistor is turned off. The idle period is also set to 100% at the

same time.

Once the under voltage lockout circuit is enabled, the protection enable is released; however, the protection

latch is not reset if the power is not turned off.

The inverting inputs (pin 6 or 11) of the D.T.C. comparator are compared to the reference voltage (about 1.1 V)

connected to the non-inverting input.

To prevent malfunction of the short-circuit protection-circuit when the soft-start operation is done by using the

DTC terminal, the D.T.C. comparator outputs a “High” level while the DTC terminal goes up to about 1.1 V, and

then closes the SCP terminal by turning transistor Q2 on.

• Protection Latch Circuit

2.46 V

1 µA

S.C.P. Comp.

15

R1

Error Amp. 1

Error Amp. 2

−

−

+

S

Latch

R

CPE

U.V.L.O.

Q1

Q2

Q3

2.1 V

−

−

+

6

DTC1

DTC2

11

1.1 V

D.T.C. Comp.

14

MB3778

■ SETTING THE IDLE PERIOD

When voltage step-up, fly-back step-up or inverted output are set, the voltage at the FB terminal may go higher

than the triangular wave voltage due to load fluctuation, etc. In this case the output transistor will be in full-on

state(ON duty 100%). This can be prevented by setting the maximum duty for the output transistor. This is done

by setting the DTC1 terminal (pin 6) voltage using resistance division of the VREF voltage as illustrated below.

When the DTC1 terminal voltage is higher than the triangular waveform voltage, the output transistor is turned

on. If the triangular waveform amplitude specified by the maximum duty calculation formula is 0.6 V, and the

lower voltage limit of the triangular waveform is 1.3 V, the formula would be as follows (other channels are similar) :

Duty (ON) max (%) =: (V^dt− 1.3 V) / 0.6 V × 100, Vdt (V) = Rb / (Ra + Rb) × VREF

Also, if no output duty setting is required, the voltage should be set greater than the upper limit voltage of the

triangular waveform, which is 1.9 V.

• Setting the idle time at DTC1 (DTC2 is similar)

16

6

VREF

Ra

Rb

DTC1

Vdt

15

MB3778

■ SETTING THE SOFT START TIME

When power is switched on, the current begins charging the capacitor (CDTC1) connected the DTC1 terminal (pin

6). The soft start process operates by comparing the soft start setting voltage, which is proportional to the DTC1

terminal voltage, with the triangular waveform, and varying the ON-duty of the OUT terminal (pin 7).

The soft start time until the ON duty reaches 50% is determined by the following equation:

Soft start time (time until output ON duty = 50%) .

ts (s) =: − C^DTC1× Ra × Rb / (Ra + Rb) × ln (1 − 1.6 (Ra + Rb) / (2.46 Rb) )

For example, if Ra = 4.7 kΩ and Rb = 10 kΩ, the result is:

ts (s) =: 0.1 × C^DTC1(µF)

• Soft Start on DCT1 terminal (DTC2 is similar)

16

6

VREF

Ra

Rb

DTC1

CDTC1

16

MB3778

■ USING THE R^TTERMINAL

The triangular waves, as shown in Figure “No VREF/2 connection to external circuits from RT terminal”, act to set

the oscillator frequency by charging and discharging the capacitor connected to the CT terminal using the current

value of the resistor connected to the RT terminal.

In addition, when voltage level V^REF/2 is output to external circuits from the RT terminal, care must be taken in

making the external circuit connections to adjust for the fact that I1 is increased by the value of the current I2 to

the external circuits in determining the oscillator frequency (see Figure “VREF/2 connection to external circuits

from RT terminal”).

• No V^REF/2 connection to external circuits from R^Tterminal

Triangular wave

ICT = IRT

oscillator

VREF

=

2RT

VREF

2

(

)

2

1

IRT

RT

ICT

CT

• V^REF/2 connection to external circuits from R^Tterminal

Triangular wave

oscillator

ICT = IRT

= I1 + I2

VREF

2RT

=

+ I2

VREF

2

(

)

2

1

IRT

I1

ICT

To external circuits

I2

RT

CT

17

MB3778

■ SYNCHRONIZATION OF ICs

A fixed condenser and resistor are inserted in the CT and RT terminals of IC which becomes a master when

synchronizing by using plurality of MB3778. As a result, the slave ICs oscillate automatically. The RT terminals

(pin 2) of the slave ICs are connected to the VREF terminal (pin 16) to disable the charge/discharge circuit for

triangular wave oscillation. The CT terminals of the master and slave ICs are connected together.

• Connection of Master, Slave

VCC

MB3778

(MASTER)

CT

RT

MB3778

(SLAVE)

MB3778

(SLAVE)

18

MB3778

■ TYPICAL CHARACTERISTICS

Power supply voltage vs.

Reference voltage

Power supply voltage vs.

Average supply current

Ta = +25 °C

Ta = +25 °C

2.0

1.0

0

5.0

2.5

0

0

4

8

12

16

20

0

4

8

12

16

20

Power supply voltage VCC (V)

Power supply voltage VCC (V)

Reference voltage vs. Temperature

2.47

Timing capacitor vs.

Triangular waveform Upper/Lower Limit voltage

VCC = VCTL = 6 V

IOR = −1 mA

2.46

2.45

2.44

2.43

2.42

2.41

2.40

2.2

2.0

Upper limit

1.8

1.6

1.4

1.2

VCC = 6 V

RT = 15 kΩ

Lower limit

1.0

Ta = +25 °C

0.8

10²

10³

10⁴

−40 −20

0

20

40

60

80

100

Timing capacitor CT (pF)

Temperature Ta (°C)

Collector saturation voltage vs.

Sink Current

Error Amp. Max. output voltage vs.

Frequency

5.0

4.0

3.0

2.0

1.0

0

3.0

2.0

VCC = 6 V

Ta = +25 °C

VCC = 6 V

Ta = +25 °C

1.0

0

100

500 1 k

5 k 10 k

50 k 100 k

500 k

Frequency (Hz)

0

100

200

300

400

500

Sink current (mA)

19

MB3778

(Continued)

Timing resistor vs. Oscillation

Triangular waveform cycle vs. Timing ca-

pacitor

frequency

VCC = 6 V

Ta = +25 °C

100

10

VCC = 6 V

RT = 15 kΩ

Ta = +25 °C

1 M

100 k

10 k

1 k

CT = 150 pF

1

CT = 1500 pF

10²

10³

10⁴

10⁵

Timing capacitor CT (pF)

CT = 15000 pF

1 k

5 k 10 k

50 k100 k

500 k

Timing resistor RT (Ω)

Temperature vs. Frequency stability

Oscillation frequency vs. Duty

10

100

80

60

40

20

0

VCC = 6 V

CT = 330 pF

RT = 15 kΩ

VCC = 6 V

CT = 330 pF

RT = 15 kΩ

Ta = +25 °C

0

−10

−40 −20

0

20

40

60

80 100 120

5 k 10 k

50 k 100 k

Oscillation frequency (Hz)

500 k 1 M

Temperature Ta (°C)

Control voltage vs. Reference voltage

Control input current

VCC = 6 V

Ta = +25 °C

VCC = 6 V

Ta = +25 °C

5.0

500

2.5

250

0

0

0

1

2

3

4

5

0

4

8

12

16

20

Control voltage VCTL (V)

Control voltage ICTL (V)

20

MB3778

(Continued)

Frequency vs. Gain/Phase

Frequency vs. Gain/Phase

(Actual Data)

CNF = OPEN

AV

CNF = 0.047 µF

40

20

180

90

40

20

180

90

AV

0

0

0

0

φ

φ

−20

−90

−180

−20

−40

−90

−180

−40

10

100

1 k

10 k

100 k

1 M

10

100

1 k

10 k

100 k

1 M

Frequency f (Hz)

Frequency f (Hz)

Frequency vs. Gain/Phase

(Actual Data)

Frequency vs. Gain/Phase

(Actual Data)

CNF = 4700 pF

CNF = 470 pF

40

180

90

40

20

180

AV

20

0

90

AV

0

0

0

φ

−20

−40

−90

−180

−20

−90

−180

φ

−40

10

100

1 k

10 k

100 k

1 M

10

100

1 k

10 k

100 k

1 M

Frequency f (Hz)

Frequency f (Hz)

Actual Circuit

VREF

VREF

CNF

4.7 kΩ

240 kΩ

4.7 kΩ

−

+

OUT

10 µF

−

+

IN

Error Amp.

4.7 kΩ

4.7 kΩ

21

MB3778

(Continued)

Power Dissipation vs. Ambient Tem-

perature (SOP)

Power Dissipation vs. Ambient Tem-

perature (SSOP)

500

700

620

600

444

400

500

400

300

200

100

0

300

200

100

0

−40

−20

0

20

40

60

80

100

−40

−20

0

20

40

60

80

100

Ambient temperature Ta (°C)

Ambient temperature Ta (°C)

Power Dissipation vs. Ambient Tem-

perature (DIP)

1100

1000

900

800

700

600

500

400

300

200

100

0

−40

−20

0

20

40

60

80

100

Ambient temperature Ta (°C)

22

MB3778

■ APPLICATION

1. Equivalent series resistor and stability of smoothing capacitor

The equivalent series resistor (ESR) of the smoothing capacitor in the DC/DC converter greatly affects the loop

phase characteristic.

The stability of the system is improved so that the phase characteristic may advance the phase to the ideal

capacitor by ESR in the high frequency region (see “Gain vs. Frequency” and “Phase vs. Frequency”).

A smoothing capacitor with a low ESR reduces system stability. Use care when using low ESR electrolytic

capacitors (OS CON^TM) and tantalum capacitors.

Note: OS CON is the trademark of Sanyo Electnic Co., Ltd.

DC/DC Converter Basic Circuit

L

Tr

RC

VIN

D

RL

C

Gain vs. Frequency

Phase vs. Frequency

0

20

0

(2)

(1)

−90

−20

−40

−60

(2)

(1) : RC = 0 Ω

(2) : RC = 31 mΩ

(1) : RC = 0 Ω

(2) : RC = 31 mΩ

(1)

−180

10

100

1 k

Frequency f (Hz)

10 k

100 k

10

100

1 k

Frequency f (Hz)

10 k

100 k

23

MB3778

Reference data

If an aluminum electrolytic smoothing capacitor (RC 1.0 Ω) is replaced with a low ESR electrolytic capacitor(OS

CON^TM: RC 0.2 Ω), the phase margin is reduced by half(see Fig. 37 and 38).

DC/DC Converter A^Vvs. φ characteristic Test Circuit

VOUT

+

VO

CNF

AV vs. φ characteristic

Between these points

−IN

+IN

−

+

VIN

FB

R2

R1

VREF/2

Error Amp.

DC/DC Converter +5 V output Gain vs. Phase

60

40

VCC = 10 V

RL = 25 Ω

CP = 0.1 µF

180

AV

+

VO

φ

20

90

AI Capacitor

220 µF (16 V)

RC 1.0 Ω : fOSC = 1 kHz

+

−

62 °

0

0

−20

−40

−90

GND

−180

100 k

10

100

1 k

10 k

Figure 38 DC/DC Converter +5 V output Gain vs. Phase

60

40

VCC = 10 V

RL = 25 Ω

CP = 0.1 µF

AV

180

90

+

VO

20

OS CON^TM

22 µF (16 V)

RC 0.2 Ω : fOSC = 1 kHz

+

−

φ

0

0

27 °

−20

−40

−90

−180

GND

10

100

1 k

10 k

100 k

Frequency f (Hz)

24

MB3778

■ ORDERING INFORMATION

Part number

Package

Remarks

16-pin Plastic DIP

(DIP-16P-M04)

MB3778P

16-pin Plastic SSOP

(FPT-16P-M05)

MB3778PFV

MB3778PF

16-pin Plastic SOP

(FPT-16P-M06)

25

MB3778

■ PACKAGES DIMENSION

16-pin, Plastic DIP

(DIP-16P-M04)

+0.20

–0.30

.770^–⁺^.^.⁰⁰¹⁰²⁸

19.55

INDEX-1

INDEX-2

6.20±0.25

(.244±.010)

0.51(.020)MIN

4.36(.172)MAX

0.25±0.05

(.010±.002)

3.00(.118)MIN

0.46±0.08

(.018±.003)

+0.30

–0

.039⁺^–0^.012

+0.30

1.52

–0

.060⁺^–0^.012

15°MAX

0.99

7.62(.300)

TYP

1.27(.050)

MAX

2.54(.100)

TYP

C

1994 FUJITSU LIMITED D16033S-2C-3

Dimensions in mm (inches) .

(Continued)

26

MB3778

(Continued)

16-pin, Plastic SSOP

(FPT-16P-M05)

*

5.00±0.10(.197±.004)

0.17±0.03

(.007±.001)

16

9

*

4.40±0.10 6.40±0.20

(.173±.004) (.252±.008)

INDEX

Details of "A" part

1.25 –⁺0⁰.^.1²0⁰

.049 –⁺.^.0⁰0⁰4⁸

(Mounting height)

1

8

LEAD No.

"A"

0.65(.026)

0.24±0.08

(.009±.003)

M

0.13(.005)

0~8°

0.10±0.10

(.004±.004)

(Stand off)

0.50±0.20

(.020±.008)

0.25(.010)

0.45/0.75

(.018/.030)

0.10(.004)

C

1999 FUJITSU LIMITED F16013S-3C-5

Dimensions in mm (inches) .

(Continued)

27

MB3778

(Continued)

16-pin, Plastic SOP

(FPT-16P-M06)

2.25(.089)MAX

10.15⁺^–0⁰^.^.²²⁰⁵.400^–.008

+.010

0.05(.002)MIN

(STAND OFF)

+0.40

INDEX

6.80^–0.20

5.30±0.30

7.80±0.40

+.016

(.209±.012) (.307±.016)

.268^–.008

"B"

+0.05

1.27(.050)

TYP

0.45±0.10

(.018±.004)

0.15^–0.02

0.50±0.20

(.020±.008)

M

Ø0.13(.005)

+.002

.006^–.001

Details of "A" part

Details of "B" part

0.40(.016)

0.20(.008)

0.15(.006)

0.20(.008)

"A"

0.10(.004)

0.18(.007)MAX

0.68(.027)MAX

0.18(.007)MAX

0.68(.027)MAX

8.89(.350)REF

C

1994 FUJITSU LIMITED F16015S-2C-4

Dimensions in mm (inches) .

28

MB3778

FUJITSU LIMITED

For further information please contact:

Japan

All Rights Reserved.

FUJITSU LIMITED

Corporate Global Business Support Division

Electronic Devices

The contents of this document are subject to change without notice.

Customers are advised to consult with FUJITSU sales

representatives before ordering.

Shinjuku Dai-Ichi Seimei Bldg. 7-1,

Nishishinjuku 2-chome, Shinjuku-ku,

Tokyo 163-0721, Japan

Tel: +81-3-5322-3347

Fax: +81-3-5322-3386

The information and circuit diagrams in this document are

presented as examples of semiconductor device applications, and

are not intended to be incorporated in devices for actual use. Also,

FUJITSU is unable to assume responsibility for infringement of

any patent rights or other rights of third parties arising from the use

of this information or circuit diagrams.

http://edevice.fujitsu.com/

North and South America

FUJITSU MICROELECTRONICS, INC.

3545 North First Street,

San Jose, CA 95134-1804, U.S.A.

Tel: +1-408-922-9000

Fax: +1-408-922-9179

The contents of this document may not be reproduced or copied

without the permission of FUJITSU LIMITED.

Customer Response Center

Mon. - Fri.: 7 am - 5 pm (PST)

Tel: +1-800-866-8608

FUJITSU semiconductor devices are intended for use in standard

applications (computers, office automation and other office

equipments, industrial, communications, and measurement

equipments, personal or household devices, etc.).

Fax: +1-408-922-9179

http://www.fujitsumicro.com/

CAUTION:

Europe

Customers considering the use of our products in special

applications where failure or abnormal operation may directly

affect human lives or cause physical injury or property damage, or

where extremely high levels of reliability are demanded (such as

aerospace systems, atomic energy controls, sea floor repeaters,

vehicle operating controls, medical devices for life support, etc.)

are requested to consult with FUJITSU sales representatives before

such use. The company will not be responsible for damages arising

from such use without prior approval.

FUJITSU MICROELECTRONICS EUROPE GmbH

Am Siebenstein 6-10,

D-63303 Dreieich-Buchschlag,

Germany

Tel: +49-6103-690-0

Fax: +49-6103-690-122

http://www.fujitsu-fme.com/

Asia Pacific

FUJITSU MICROELECTRONICS ASIA PTE. LTD.

#05-08, 151 Lorong Chuan,

New Tech Park,

Any semiconductor devices have inherently a certain rate of failure.

You must protect against injury, damage or loss from such failures

by incorporating safety design measures into your facility and

equipment such as redundancy, fire protection, and prevention of

over-current levels and other abnormal operating conditions.

Singapore 556741

Tel: +65-281-0770

Fax: +65-281-0220

http://www.fmap.com.sg/

If any products described in this document represent goods or

technologies subject to certain restrictions on export under the

Foreign Exchange and Foreign Trade Control Law of Japan, the

prior authorization by Japanese government should be required for

export of those products from Japan.

Korea

FUJITSU MICROELECTRONICS KOREA LTD.

1702 KOSMO TOWER, 1002 Daechi-Dong,

Kangnam-Gu,Seoul 135-280

Korea

Tel: +82-2-3484-7100

Fax: +82-2-3484-7111

F0012

FUJITSU LIMITED Printed in Japan

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