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May 2007

FAN7711

Ballast Control Integrated Circuit

Features

Description

Floating Channel for Bootstrap Operation to +600V

Low Start-up and Operating Current: 120μA, 3.2mA

Under-Voltage Lockout with 1.8V of Hysteresis

Adjustable Run Frequency and Preheat Time

Internal Active ZVS Control

The FAN7711, developed with Fairchild’s unique high-

voltage process, is a ballast control integrated circuit (IC)

for a fluorescent lamp. FAN7711 incorporates a preheating

/ ignition function, controlled by an user-selected external

capacitor, to increase lamp life. The FAN7711 detects

switch operation from after ignition mode through an

internal active Zero-Voltage Switching (ZVS) control

circuit. This control scheme enables the FAN7711 to

detect an open-lamp condition, without the expense of

external circuitry, and prevents stress on MOSFETs. The

high-side driver built into the FAN7711 has a common-

mode noise cancellation circuit that provides robust

operation against high-dv/dt noise intrusion.

Internal Protection Function (Latch Mode)

Internal Clamping Zener Diode

High Accuracy Oscillator

Soft-Start Functionality

8-DIP

8-SOP

Applications

Electronic Ballast

Ordering Information

Part Number

FAN7711N

Package

Pb-Free

Operating Temperature Range Packing Method

8-DIP

Tube

FAN7711M

Yes

-25°C ~ 125°C

Tube

8-SOP

FAN7711MX

Tape & Reel

Typical Application

D5

D6

R3

R1

U1

D1

D2

V_DD

V_B

1

2

8

7

6

5

Main

Supply

R4

R5

HO

V_S

RT

CPH

GND

C1

FAN7711

Q1

Q2

C4

D7

C5

L1

C6

3

4

LO

D3

D4

C2

R2

C3

Lamp

C7

FAN7711 Rev. 1.00

Figure 1. Typical Application Circuit for Compact Fluorescent Lamp

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

Internal Block Diagram

V_DD

1

HIGH-SIDE DRIVER

V_B

10V

REG

V_B

8

15V SHUNT

REGULATOR

UVLO

Q

S

R

Noise

Canceller

7

6

HO

V_S

I_PH=0.6*I_RT

BIAS & SYSTEM LATCH

I_RT

SDH

I_PH

UVLO

4V

UVLO

BGR

R

S

Q

I_PH

*

I_RT

2

RT

CPH

3V 5V

BIAS TSD

SET

0A

SDL

CPH

PRE-HEAT

Control

SYSHALT

RESET

I_PH

*

CPH<3V

DEAD-TIME Control

Yes

V_DDH/V_DD

LSH

V_DDH/V_DD

LSH

LOW-SIDE GATE DRIVER

2μA

OSCILLATOR

No

12μA

DELAY

5

LO

SDL

SDH

3

CPH

S

R

Q

OUTPUT

TRANSITION

SENSING

ADAPTIVE

ZVS CONTROLLER

SDL

SDH

RESET

Q

5V/3V

SYSHALT

ADAPTIVE ZVS ENABLE LOGIC

4

FAN7711 Rev. 1.00

GND

Figure 2. Functional Block Diagram

Pin Configuration

V_B

8

HO

7

V_S

6

LO

5

FAN7711

YWW

(YWW : Work Week Code)

1

2

3

4

V_DD

RT

CPH

GND

FAN7711 Rev. 1.00

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin #

Name

Description

1

2

3

4

5

6

7

8

V_DD

RT

Supply voltage

Oscillator frequency set resistor

Preheating time set capacitor

Ground

CPH

GND

LO

Low-side output

V_S

High-side floating supply return

High-side output

HO

V_B

High-side floating supply

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

2

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-

ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-

tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The

absolute maximum ratings are stress ratings only. T_A=25°C unless otherwise specified.

Symbol

V_B

Parameter

Min.

-0.3

Typ.

Max.

625

600

8

Unit

V

High-side floating supply

V_S

High-side floating supply return

RT, CPH pins input voltage

Clamping current level

V

V_IN

V

I_CL

25

mA

V/ns

°C

dV_S/dt

T_A

Allowable offset voltage slew rate

Operating temperature range

Storage temperature range

50

-25

-65

125

150

T_STG

°C

8-SOP

8-DIP

8-SOP

8-DIP

0.625

1.2

P_D

Power dissipation

W

200

100

θ_JA

Thermal resistance (junction-to-air)

°C/W

Note:

1. Do not supply a low-impedance voltage source to the internal clamping Zener diode between the GND and the V_DD

pin of this device.

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

3

Electrical Characteristics

V_BIAS(V_DD, V_BS) = 14.0V, T_A= 25°C, unless otherwise specified.

Symbol

Characteristics

Conditions

Min. Typ. Max. Unit

Supply Voltage Section

V_DDTH(ST+)V_DDUVLO positive going threshold

V_DDTH(ST-)V_DDUVLO negative going threshold

V_DDHY(ST)V_DD-side UVLO hysteresis

V_DDincreasing

12.4

10.8

13.4

11.6

1.8

14.4

12.4

V_DDdecreasing

V

V_CL

I_ST

Supply clamping voltage

I_DD=10mA

14.8

15.2

120

3.2

Start-up supply current

V_DD= 10V

μA

I_DD

Dynamic operating supply current

50kHz, C_L= 1nF

mA

High-Side Supply Section (V_B-V_S)

V_HSTH(ST+)High-side UVLO positive going threshold

V_HSTH(ST-)High-side UVLO negative going threshold

V_HSHY(ST)High-side UVLO hysteresis

V_BSincreasing

V_BSdecreasing

8.5

7.9

9.2

8.6

0.6

50

1

10.0

9.5

V

I_HST

I_HD

I_LK

High-side quiescent supply current

High-side dynamic operating supply current

Offset supply leakage current

V_BS= 14V

μA

mA

μA

50kHz, C_L= 1nF

V_B= V_S= 600V

45

Oscillator Section

V_MPHCPH pin preheating voltage range

I_PH

2.5

1.25

8

3.0

2.00

12

3.5

2.85

16

V

CPH pin charging current during preheating

CPH pin charging current during ignition

CPH pin voltage level at running mode

Preheating frequency

V_CPH= 1V

V_CPH= 4V

μA

I_IG

V_MO

f_PRE

f_OSC

7.0

85

V

R_T= 80kΩ, V_CPH= 2V

R_T= 80kΩ

72

98

kHz

Running frequency

48.7

53.0

57.3

V

_CPH= 1V, V_S= GND during

DT_MAX

DT_MIN

Maximum dead time

Minimum dead time

3.1

1.0

μs

preheat mode

V

mode

_CPH= 6V, V_S= GND during run

Output Section

I_OH+

I_OH-

I_OL+

I_OL-

High-side driver sourcing current

PW = 10μs

250

500

250

500

350

650

350

650

45

High-side driver sinking current

Low-side driver sourcing current

Low-side driver sink current

PW = 10μs

mA

PW = 10μs

t_HOR

t_HOL

t_LOR

t_LOL

High-side driver turn-on rising time

High-side driver turn-off rising time

Low-side driver turn-on rising time

Low-side driver turn-off rising time

C_L= 1nF, V_BS= 15V

25

ns

V

45

25

Maximum allowable negative V_Sswing range for

signal propagation to high-side output

(2)

V_S

-9.8

Protection Section

V_CPHSDShutdown voltage

I_SD

2.6

V

V_RT= 0 after run mode

Shutdown current

250

165

450

μA

°C

TSD

Thermal shutdown⁽²⁾

Note:

2. This parameter, although guaranteed, is not 100% tested in production.

www.fairchildsemi.com

FAN7711 Rev. 1.0.3

4

Typical Characteristics

3.0

2.5

2.0

1.5

1.0

200

180

160

140

120

100

80

-40 -20

0

20

40

60

80 100 120

-40 -20

0

20

40

60

80 100 120

Temperature [°C]

Figure 4. Start-Up Current vs. Temp.

Figure 5. Preheating Current vs. Temp.

16

4.0

14

12

10

8

3.5

3.0

2.5

2.0

-40 -20

0

20

40

60

80 100 120

-40 -20

0

20

40

60

80 100 120

Temperature [°C]

Figure 6. Ignition Current vs. Temp

Figure 7. Operating Current vs. Temp.

100

400

80

60

40

20

0

300

200

100

0

-40 -20

0

20

40

60

80 100 120

-40 -20

0

20

40

60

80 100 120

Temperature [°C]

Figure 8. Start-Up Current vs. Temp.

Figure 9. Shutdown Current vs. Temp.

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

5

Typical Characteristics (Continued)

14.4

14.0

10.0

9.6

9.2

8.8

8.4

8.0

13.6

ST+

13.2

12.8

12.4

12.0

ST+

ST-

11.6

11.2

10.8

10.4

-40 -20

0

20

40

60

80 100 120

-40 -20

0

20

40

60

80 100 120

Temperature [°C]

Figure 10. V_DDUVLO vs. Temp.

Figure 11. V_BSUVLO vs. Temp.

2.8

2.6

2.4

2.2

2.0

1.8

1.6

1.4

1.2

16.2

16.0

15.8

15.6

15.4

15.2

15.0

14.8

-40 -20

0

20

40

60

80 100 120

-40 -20

0

20

40

60

80 100 120

Temperature [°C]

Figure 12. V_DDClamp Voltage vs. Temp.

Figure 13. Shutdown Voltage vs. Temp.

100

58

56

54

52

50

48

95

90

85

80

75

70

-40 -20

0

20

40

60

80 100 120

-40 -20

0

20

40

60

80 100 120

Temperature [°C]

Figure 14. Running Frequency vs. Temp.

Figure 15. Preheating Frequency vs. Temp.

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

6

Typical Characteristics (Continued)

1.8

1.6

1.4

1.2

1.0

0.8

0.6

4.0

3.6

3.2

2.8

2.4

2.0

-40 -20

0

20

40

60

80 100 120

-40 -20

0

20

40

60

80 100 120

Temperature [°C]

Figure 16. Minimum Dead Time vs. Temp.

Figure 17. Maximum Dead Time vs. Temp.

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

7

Typical Application Information

Before the lamp is ignited, the lamp impedance is very

high. Once the lamp is turned on, the lamp impedance

significantly decreases. Since the resonant peak is very

high due to the high-resistance of the lamp at the instant

of turning on the lamp, the lamp must be driven at higher

frequency than the resonant frequency, shown as (A) in

Figure 19. In this mode, the current supplied by the

inverter mainly flows through C_P. C_Pconnects both

1. Under-Voltage Lockout (UVLO) Function

The FAN7711 has UVLO circuits for both high-side and

low-side circuits. When V

reaches V

, UVLO

DD

DDTH(ST+)

is released and the FAN7711 operates normally. At UVLO

condition, FAN7711 consumes little current, noted I

.

ST

Once UVLO is released, FAN7711 operates normally

until V goes below V , the UVLO hysteresis. At

DD

DDTH(ST-)

UVLO condition, all latches that determine the status of

the IC are reset. When the IC is in the shutdown mode,

filaments and makes the current path to ground. As a

result, the current warms up the filament for easy

ignition. The amount of the current can be adjusted by

controlling the oscillation frequency or changing the

capacitance of C_P. The driving frequency, f_PRE, is called

the IC can restart by lowering V

below V

.

DD

DDTH(ST-)

FAN7711 has a high-side gate driver circuit. The supply

for the high-side driver is applied between V_Band V_S. To

preheating frequency and is derived by:

protect the malfunction of the driver at low supply

voltage, between V_Band V_S, FAN7711 provides an

additional UVLO circuit between the supply rails. If V_B-

V_Sis under V_HSTH(ST+), the driver holds low-state to turn

(EQ 1)

f_PRE= 1.6 × f_OSC

off the high-side switch, as shown in Figure 18. As long

as V_B-V_Sis higher than V_HSTH(ST-)after V_B-V_Sexceeds

After the warm-up, the FAN7711 decreases the

frequency, shown as (B) of Figure 19. This action

increases the voltage of the lamp and helps the

fluorescent lamp ignite. The ignition frequency is

described as a function of CPH voltage, as follows:

V_HSTH(ST+), operation of the driver continues.

2. Oscillator

The ballast circuit for a fluorescent lamp is based on the

LCC resonant tank and a half-bridge inverter circuit, as

shown in Figure 18. To accomplish Zero-Voltage

Switching (ZVS) of the half-bridge inverter circuit, the

LCC is driven at a higher frequency than its resonant

frequency, which is determined by L, C_S, C_P, and R_L,

(EQ 2)

⎡

⎤

+1 × f

CPH OSC

f_IG

=

0.3 × 5-V

(

)

⎣

⎦

where V_CPHis the voltage of CPH capacitor.

where R_Lis the equivalent lamp's impedance

Equation 2 is valid only when V_CPHis between 3V to 5V

before FAN7711 enters running mode. Once V_CPH

.

V_DC

reaches 5V, the internal latch records the exit from

ignition mode. Unless V_DDis below V_DDTH(ST-), the

FAN7711

V_DD

RT

V_B

HO

V_S

preheating and ignition modes appear only once during

lamp start transition.

High-side

driver

Oscillator

V_DD

LCC resonant tank

RT

Finally, the lamp is driven at a fixed frequency by an

external resistor, R_T, shown as (C) of Figure 19. If V_DDis

Filament

L

C_S

Dead-time

controller

CPH

Low-side

driver

CPH

GND

R_L

C_P

higher than V_DDTH(ST+)and UVLO is released, the

voltage of R_Tpin is regulated to 4V. This voltage adjusts

LO

equivalent lamp impedance

FAN7711 Rev. 1.00

the oscillator's control current according to the resistance

of R_T. Because this current and an internal capacitor set

Figure 18. Resonant Inverter Circuit Based on

LCC Resonant Tank

the oscillation frequency, the FAN7711 does not need

any external capacitors.

The proposed oscillation characteristic is given by:

The transfer function of LCC resonant tank is heavily

dependent on the lamp impedance, R_L, as illustrated in

Figure 19. The oscillator in FAN7711 generates effective

driving frequencies to assist lamp ignition and improve

lamp life longevity. Accordingly, the oscillation frequency

is changed in the following sequence:

4 ×10⁹

RT

(EQ 3)

f_OSC

=

Preheating freq.->Ignition freq.-> Normal running freq.

Even in the active ZVS mode, shown as (D) in Figure 19,

the oscillation frequency is not changed. The dead-time

is varied according to the resonant tank characteristic.

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

8

CPH voltage [V]

8

(C) Active ZVS mode

40dB

20dB

(B) Ignition Mode

7

6

5

4

3

2

R_L=100k

(A) Preheating Mode

(D) Shutdown

mode

1

0

R_L=10k

Preheating

frequency

3

2

1

time

0

Dead Time[μs]

(B)

Oscillation

Frequency

Preheating Frequency:f_PRE

0dB

Preheating

Mode

(A)

(C)

R_L=1k

Running Frequency:

f_OSC

Running

Mode

Ignition

Mode

Running frequency

R_L=500

time

t0

FAN7711 Rev. 1.00

t1 t2 t3

(D) Dead-time control mode

at fixed frequency

FAN7711 Rev. 1.00

Figure 20. Operation Modes

Figure 19. LCC Transfer Function in Terms of

Lamp Impedance

3.1 Preheating Mode (t0~t1)

When V_DDexceeds V_DDTH(ST+), the FAN7711 starts

operation. At this time, an internal current source (I_PH

)

3. Operation Modes

charges CPH. CPH voltage increases from 0V to 3V in

preheating mode. Accordingly, the oscillation frequency

follows the Equation 4. In this mode, the lamp is not

ignited, but warmed up for easy ignition. The preheating

time depends on the size of CPH:

FAN7711 has four operation modes: (A) preheating

mode, (B) ignition mode, (C) active ZVS mode, and (D)

shutdown mode, depicted in Figure 20. The modes are

automatically selected by the voltage of CPH capacitor,

shown in Figure 20. In modes (A) and (B), the CPH acts

as a timer to determine the preheating and ignition times.

After the preheating and ignition modes, the role of the

CPH is changed to stabilize the active ZVS control

circuit. In this mode, the dead time of the inverter is

selected by the voltage of CPH. Only when FAN7711 is

in active ZVS mode is it possible to shut off the whole

system using CPH pin. Pulling the CPH pin below 2V in

active ZVS mode, causes the FAN7711 to enter

shutdown mode. In shutdown mode, all active operation

is stopped, except UVLO and some bias circuitry. The

shutdown mode is triggered by the external CPH control

or the active ZVS circuit. The active ZVS circuit

automatically detects lamp removal (open-lamp

condition) and decreases CPH voltage below 2V to

protect the inverter switches from damage.

3 ×CPH

I_PH

(EQ 4)

f_preheat

=

[Sec.]

According to preheating process, the voltage across the

lamp to ignite is reduced and the lifetime of the lamp is

increased. In this mode, the dead time is fixed at its

maximum value.

3.2 Ignition Mode (t1~t2)

When the CPH voltage exceeds 3V, the internal current

source to charge CPH is increased about six times larger

than I_PH, noted as I_IG, causing rapid increase in CPH

voltage. The internal oscillator decreases the oscillation

frequency from f_PREto f_OSCas CPH voltage increases.

As depicted in Figure 20, lowering the frequency

increases the voltage across the lamp. Finally, the lamp

ignites. Ignition mode is defined when CPH voltage lies

between 3V and 5V. Once CPH voltage reaches 5V, the

FAN7711 does not return to ignition mode, even if the

CPH voltage is in that range, until the FAN7711 restarts

from below V_DDTH(ST-). Since the ignition mode

continues when CPH is from 3V to 5V, the ignition time is

given by:

2 ×CPH

I_IG

t_ignition

=

[Sec.]

(EQ 5)

In this mode, dead time varies according to the CPH

voltage.

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

9

3.3 Running and Active Zero-Voltage Switching

(AZVS) Modes (t2~)

3.4 Shutdown Mode

If the voltage of capacitor CPH is decreased below

~2.6V by an external application circuit or internal

protection circuit, the IC enters shutdown mode. Once

the IC enters shutdown mode, this status continues until

an internal latch is reset by decreasing V_DDbelow

When CPH voltage exceeds 5V, the operating frequency

is fixed to f_OSCby R_T. However, active ZVS operation is

not activated until CPH reaches ~6V. The FAN7711

prepares for active ZVS operation from the instant CPH

exceeds 5V during t2 to t3. When CPH becomes higher

than ~6V at t3, the active ZVS operation is activated. To

determine the switching condition, FAN7711 detects the

transition time of the output (V_Spin) of the inverter by

V_DDTH(ST-). Figure 22 shows an example of external

shutdown control circuit.

using VB pin. From the output-transition information,

FAN7711 controls the dead time to meet the ZVS

condition. If ZVS is satisfied, the FAN7711 slightly

increases the CPH voltage to reduce the dead time and

to find optimal dead time, which increases the efficiency

and decreases the thermal dissipation and EMI of the

inverter switches. If ZVS fails, the FAN7711 decreases

CPH voltage to increase the dead time. CPH voltage is

adjusted to meet optimal ZVS operation. During the

active ZVS mode, the amount of the charging/

discharging current is the same as I_PH. Figure 21 depicts

3

4

CPH

FAN7711

Shutdown

Q1

GND

FAN7711 Rev. 1.00

Figure 22. External Shutdown Circuit

The amount of the CPH charging current is the same as

I_PH, making it possible to shut off the IC using small

normal operation waveforms.

signal transistor. FAN7711 provides active ZVS

operation by controlling the dead time according to the

voltage of CPH. If ZVS fails, even at the maximum dead

time, FAN7711 stops driving the inverter.

V_DD

V_DDTH(ST+)

V_DDTH(ST-)

The FAN7711 thermal shutdown circuit senses the

junction temperature of the IC. If the temperature

exceeds ~160°C, the thermal shutdown circuit stops

operation of the FAN7711.

time

CPH

Active ZVS activated

6V

5V

Dead time settling

3V

2V

The current usages of shutdown mode and under-

voltage lockout status are different. In shutdown mode,

some circuit blocks, such as bias circuits, are kept alive.

Therefore, the current consumption is slightly higher

than during under-voltage lockout.

time

Ignition

Running mode

Lamp

Voltage

Active ZVS mode

0V

time

Preheating period

(Filament warm-up)

OUT

4. Automatic Open-Lamp Detection

FAN7711 can automatically detect the open-lamp

condition. When the lamp is opened, the resonant tank

fails to make a closed-loop to the ground, as shown in

Figure 23. The supplied current from the V_Spin is used

0V

time

Perfect ZVS

Zoom-in

to charge and discharge the charge pump capacitor, C_P.

Since the open-lamp condition means resonant tank

absence, it is impossible to meet ZVS condition. In this

condition, the power dissipation of the FAN7711, due to

capacitive load drive, is estimated as:

t=1/f_OSC

Dead time

FAN7711 Rev. 1.00

1

Figure 21. Typical Transient Waveform from

Preheating to Active ZVS Mode

2

(EQ 6)

P_Dissipation

=

×C_P×V_DC× f [W ]

2

where f is driving frequency and V_DCis DC-link voltage.

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

10

5. Power Supply

DB

FAN7711

V_DC

When V_DDis lower than V_DDTH(ST+), it consumes very

little current, I_ST, making it possible to supply current to

the V_DDpin using a resistor with high resistance (R_startin

V_DD

RT

V_B

HO

V_S

C_B

C_VDD

RT

High-side

driver

Figure 25). Once UVLO is released, the current

consumption is increased and whole circuits are

operated, which requires additional power supply for

stable operation. The supply must deliver at least several

mA. A charge pump circuit is a cost-effective method to

create an additional power supply and allows C_Pto be

Oscillator

LCC resonant tank

Filament Open

L

C_S

Dead-time

controller

CPH

Low-side

driver

CPH

GND

R_L

C_P

LO

equivalent lamp impedance

C_CP

used to reduce the EMI.

Dp2

Charge Pump

Dp1

FAN7711 Rev. 1.00

Figure 23. Current Flow When the Lamp is Open

DB

V_DC

R_start

FAN7711

V_B

HO

V_S

V_DD

RT

Assuming that C_P, V_DC, and f are 1nF, 311V, and 50kHz,

C_B

dv/dt

respectively; the power dissipation reaches about 2.4W

and the temperature of FAN7711 is increased rapidly. If

no protection is provided, the IC can be damaged by the

thermal attack. Note that hard-switching condition during

the capacitive-load drive causes lots of EMI.

+

Shunt

regulator

LCC resonant tank

(2)

C_VDD

Filament Open

L

C_S

CPH

GND

R_L

C_P

LO

Ccp

Dp1

Charge Pump

equivalent lamp impedance

(1)

FAN7711 Rev. 1.00

Figure 24 illustrates the waveforms during the open-

lamp condition. In this condition, the charging and

discharging current of C_Pis directly determined by

Dp2

FAN7711 and considered hard-switching condition. The

FAN7711 tries to meet ZVS condition by decreasing

CPH voltage to increase dead time. If ZVS fails and CPH

goes below 2V, even though the dead time reaches its

maximum value, FAN7711 shuts off the IC to protect

against damage. To restart FAN7711, V_DDmust be

Figure 25. Local Power Supply for V_DDUsing a

Charge Pump Circuit

As presented in Figure 25, when V_Sis high, the inductor

current and C_CPcreate an output transition with the

slope of dv/dt. The rising edge of V_Scharges C_CP. At that

time, the current that flows through C_CPis:

below V_DDTH(ST-)to reset an internal latch circuit, which

remembers the status of the IC.

dv

(EQ 7)

I ≅ C_CP

×

Shutdown

Release Restart

dt

V_DD

V_DDTH(ST+)

V_DDTH(ST-)

This current flows along the path (1). It charges C_VDD

,

which is a bypass capacitor to reduce the noise on the

supply rail. If C_VDDis charged over the threshold voltage

time

of the internal shunt regulator, the shunt regulator is

turned on and regulates V_DDwith the trigger voltage.

Active ZVS activated

CPH

6V

5V

Automatic

Shutdown

When V_Sis changing from high to low state, C_CPis

3V

2V

discharged through Dp2, shown as path (2) in Figure 26.

These charging/discharging operations are continued

until FAN7711 is halted by shutdown operation. The

charging current, I, must be large enough to supply the

operating current of FAN7711.

time

Running mode

Active ZVS mode

OUT

0V

time

The supply for the high-side gate driver is provided by

the boot-strap technique, as illustrated in Figure 26.

When the low-side MOSFET connected between V_Sand

Shutdown

mode

Preheating period

(Filament warm-up)

Ignition period

FAN7711 Rev. 1.00

GND pins is turned on, the charging current for V_Bflows

through D_B. Every low V_Sgives the chance to charge the

C_B. Therefore C_Bvoltage builds up only when FAN7711

operates normally.

Figure 24. CPH Voltage Variation in Open-Lamp

Condition

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

11

When V_Sgoes high, the diode D_Bis reverse-biased and

C_Bsupplies the current to the high-side driver. At this

time, since C_Bdischarges, V_B-V_Svoltage decreases. If

V_B-V_Sgoes below V_HSTH(ST-), the high-side driver

cannot operate due to the high-side UVLO protection

circuit. C_Bmust be chosen to be large enough not to fall

into UVLO range due to the discharge during a half of

the oscillation period, especially when the high-side

MOSFET is turned on.

Bootstrap circuit

DB

V_DC

R_start

FAN7711

V_DD

RT

V_B

HO

V_S

C_B

+

LCC resonant tank

Shunt

regulator

C_VDD

Charging path

C_S^{Filament Open}

L

CPH

GND

R_L

C_P

LO

equivalent lamp impedance

C_CP

Dp1

Dp2

FAN7711 Rev. 1.00

Charge Pump

Figure 26. Implementation of Floating Power Supply

Using the Bootstrap Method

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

12

Design Guide

If R_startmeets Equation 14, restart operation is possible.

However, it is not recommended to choose R_startat that

range because V_DDrising time could be long and it

1. Start-up Circuit

The start-up current (I_ST) is supplied to the IC through

the start-up resistor, R_start. Once operation starts, the

increases the lamp's turn-on delay time, as depicted in

Figure 27.

power is supplied by the charge pump circuit. To reduce

the power dissipation in R_start, select R_startas high as

possible, considering the current requirements at start-

up. For 220V_ACpower, the rectified voltage by the full-

V_DD

V_CL

V_DDTH(ST+)

wave rectifier makes DC voltage, as shown in Equation

8. The voltage contains lots of AC component due to

poor regulation characteristic of the simple full-wave

rectifier:

V_DDTH(ST-)

t_start

V_DC

= 2 × 220[V] ≅ 311[V]

(EQ 8)

Considering the selected parameters, R_startmust satisfy

the following equation:

0

time

FAN7711 Rev. 1.00

Figure 27. V_DDBuild-up

V_DC−V_{DDTH(ST +)}

(EQ 9)

> I_ST

R _start

Figure 28 shows the equivalent circuit for estimating

t_start. From the circuit analysis, V_DDvariation versus time

From Equation 9, R_startis selected as:

is given by:

V_DC−V_{DDTH(ST +)}

(EQ 10)

> R _start

_start⋅C_VDD

)

V_DD(t) = V − R_start⋅I_ST1 − e^{−t /(R}

(EQ 15)

(

)

(

)

I_ST

DC

Note that if choosing the maximum R_start, it takes long

time for V_DDto reach V_DDTH(st+). Considering V_DDrising

time, R_startmust be selected as shown in Figure 30.

where C_VDDis the total capacitance of the bypass

capacitors connected between V_DDand GND.

From Equation 15, it is possible to calculate t_startby

Another important concern for choosing R_startis the

substituting V_DD(t)with V_DDTH(ST+)

:

available power rating of R_start. To use a commercially

V_DC− R_start⋅I_ST−V_{DDTH(ST +)}

V_DD− R_start⋅I_ST

available, low-cost 1/4Ω resistor, R_startmust obey the

following rule:

(EQ 16)

t_start= −R_start⋅C_VDD⋅ln

2

In general, Equation 16 can be simplified as:

V

(

− V_CL

)

1

4

DC

(EQ 11)

<

[W ]

R_start

R_start⋅C_VDD⋅V_{DDTH(ST +)}

t_start

≈

(EQ 17)

V_DC− R_start⋅I_ST−V_{DDTH(ST +)}

Assuming V_DC=311V and V_CL=15V, the minimum

resistance of R_startis about 350kΩ.

Accordingly, t_startcan be controlled by adjusting the

value of R_startand C_VDD. For example, if V_DC=311V,

When the IC operates in shutdown mode due to thermal

protection, open-lamp protection, or hard-switching

protection, the IC consumes shutdown current, I_SD

R_start=560k, C_VDD=10µF, I_st=120µA, and V_DDTH(ST+)

13.5V, t_startis about 0.33s.

=

,

which is larger than I_ST. To prevent restart during this

mode, R_startmust be selected to cover I_SDcurrent

consumption. The following equation must be satisfied:

V_DC−V_{DDTH(ST +)}

R_start

I_ST

(EQ 12)

> R _start

I_SD

V_DD

From Equations 10 - 12; it is possible to select R_start

:

RT

(1) For safe start-up without restart in shutdown mode:

C_VDD

CPH

V_DC−V_{DDTH(ST +)}

2

4 V −V_CL< R_start

<

(

)

(EQ 13)

DC

I_SD

GND

(2) For safe start-up with restart from shutdown mode:

FAN7711 Rev. 1.00

V_DC−V_{DDTH(ST +)}

< R_start

<

(EQ 14)

I_SD

I_ST

Figure 28. Equivalent Circuit During Start

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

13

2. Current Supplied by Charge Pump

3. Lamp Turn-on Time

For the IC supply, the charge pump method is used in

Figure 29. Since C_CPis connected to the half-bridge

The turn-on time of the lamp is determined by supply

build-up time t_start, preheating time, and ignition time;

output, the supplied current by C_CPto the IC is

determined by the output voltage of the half-bridge.

where t_starthas been obtained by Equation 17. When the

IC's supply voltage exceeds V_DDTH(ST+)after turn-on or

restart, the IC operates in preheating mode. This

operation continues until CPH pin's voltage reaches ~3V.

In this mode, CPH capacitor is charged by I_PHcurrent,

When the half-bridge output shows rising slope, C_CPis

charged and the charging current is supplied to the IC.

The current can be estimated as:

as depicted in Figure 30. The preheating time is

achieved by calculating:

V_DC

DT

dV

dt

I = C_CP

≈ C_CP

(EQ 18)

CPH

where DT is the dead time and dV/dt is the voltage

variation of the half-bridge output.

t_preheat= 3

(EQ 21)

I_PH

When the half-bridge shows falling slope, C_CPis

discharged through Dp2. Total supplied current, I_total, to

the IC during switching period, t, is:

The preheating time is related to lamp life (especially

filament); therefore, the characteristics of a given lamp

should be considered when choosing the time.

I_total= I ⋅DT = C_CP⋅V_DC

(EQ 19)

V_DD

From Equation 19, the average current, I_avg, supplied to

the IC is obtained by:

RT

I_PH

CPH

I_totalC_CP⋅V_DC

CPH

GND

I_avg

=

= C_CP⋅V_DC⋅f

(EQ 20)

t

FAN7711 Rev. 1.00

For the stable operation, I_avgmust be higher than the

required current. If I_avgexceeds the required current, the

Figure 30. Preheating Timer

residual current flows through the shunt regulator

implemented on the chip, which can cause unwanted

heat generation. Therefore, C_CPmust be selected

Compared to the preheating time, it is almost impossible

to exactly predict the ignition time, whose definition is the

time from the end of the preheating time to ignition. In

general, the lamp ignites during the ignition mode.

Therefore, assume that the maximum ignition time is the

same as the duration of ignition mode, from 3V until CPH

reaches 5V. Thus, ignition time can be defined as:

considering stable operation and thermal generation.

For example, if C_CP=0.5nF, V_DC=311V, and f=50kHz, I_avg

is ~7.8mA; it is enough current for stable operation.

CPH

I_IG

CPH

I_IG

t_ignition= (5 − 3)

= 2

(EQ 22)

Discharging mode

Charging mode

C_CP

Dp1

To V_DD

Dp1

To V_DD

I_dp1=0

I_dp1

C_VDD

Note that, at ignition mode, CPH is charged by I_IG, which

is six times larger than I_PH. Consequently, total turn-on

time is approximately:

C_VDD

Dp2

f=1/t

V_DC

VDD Build-Time + Preheating Time + Ignition Time =

DT:dead time

Half-bridge output

CPH

I_IG

CPH

I_IG

(EQ 23)

t_ignition= (5 − 3)

= 2

[Sec.]

I_dp1

FAN7711 Rev. 1.00

Figure 29. Charge Pump Operation

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

14

4. PCB Guideline

Component selection and placement on PCB is important

In addition, the ground return path of the timing

components (C_PH, R_T) and V_DDdecoupling capacitor

when using power control ICs. Bypass the V

to GND

CC

as close to the IC terminals as possible with a low-ESR/

ESL capacitor, as shown in Figure 31. This bypassed

should be connected directly to the IC GND lead and not

via separate traces or jumpers to other ground traces on

the board. These connection techniques prevent high-

current ground loops from interfering with sensitive

timing component operations and allow the control circuit

to reduce common-mode noise due to output switching.

capacitor (C ) can reduce the noise from the power

BP

supply parts, such as start-up resistor and charge pump.

The signal GND must be separated from the power

GND. So, the signal GND should be directly connected

to the rectify capacitor using an individual PCB trace.

HOT

Cbp

RT

Cph

One point SGND

SGND

PGND

Figure 31. Preheating Timer

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

15

Typical Application Diagram

Rectified

Waveform

D5

V_DC

L2

D6

ZD1

C6

R1

D7

R3

INV

R10

R11

D1

D2

FUSE

NTC

R4

D8

R5

VCC

OUT

GND

ZCD

1

2

3

4

8

7

6

5

R2

C3

C4

C5

L1

AC

INP U T

COMP

MOT

CS

TNR

C1

C2

M1

C11

R12

R13

R8

R6

C8

R7

D3

D4

C7

C9

C10

R9

Rectified

Waveform

L3

C55

D50

R50

D51

R51

R52

C56

Lamp

V_DD

V_B

HO

V_S

1

8

7

6

5

C54

RT

C53

D52

2

3

4

M2

M3

R54

R56

L4

C57

R55

R57

CPH

GND

R53

C52

LO

C51

C50

C58

Lamp

FAN7711 Rev. 1.00

Figure 32. Application Circuit of 32W Two Lamps

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

16

Component List for 32W Two Lamps

Part

Value

Resistor

Note

Part

C55

C56

C57

C58

Value

Note

15nF/630V

2.7nF/1kV

15nF/630V

2.7nF/1kV

Miller Capacitor

R1

R2

330kΩ

750kΩ

100Ω

20kΩ

47Ω

1/2W

1/4W

1/2W

1/4W

1W

R3

R4

Diode

R5

D1

D2

1N4007

UF4007

1N4148

UF4007

IN4746A

1kV,1A

R6

10kΩ

50kΩ

47kΩ

0.3Ω

R7

D3

1kV,1A

R8

D4

1kV,1A

R9

D5

Ultra Fast,1kV,1A

100V,1A

R10

R11

R12

R13

R50

R51

R52

R53

R54

R55

R56

R57

R58

1MΩ

1/4W

1/4W,1%

2W

D6

1MΩ

D7

12.6kΩ

220kΩ

150kΩ

90kΩ

10Ω

D8

100V,1A

D50

D51

D52

ZD1

Ultra Fast,1kV,1A

Zener 18V, 1W

1/4W

1/4W,1%

1/4W

MOSFET

M1

M2

M3

FQPF5N60C

FQPF5N50C

500V,6A

500V,5A

47Ω

47kΩ

47Ω

Fuse

47kΩ

Fuse

TNR

3A/250V

471

Capacitor

TNR

NTC

C1

C2

47nF/275V_AC

150nF/275V_AC

2200pF/3kV

0.22µF/630V

12nF/50V

Box Capacitor

C3

Ceramic Capacitor

Miller Capacitor

C4

NTC

LF1

L1

10D-09

C5

Line Filter

40mH

Transformer

0.94mH(75T:10T)

Inductor

3.2mH(130T)

IC

C6

Ceramic Capacitor

Electrolytic Capacitor

Ceramic Capacitor

Electrolytic Capacitor

Ceramic Capacitor

Ceramic Capacitor,5%

Ceramic Capacitor

C7

22µF/50V

C8

39pF/50V

EI2820

C9

1µF/50V

C10

C11

C50

C51

C52

C53

C54

0.1µF/50V

47µF/450V

10µF/50V

L2

L3

EI2820

1µF/50V

U1

U2

FAN7711

FAN7529

Fairchild Semiconductor

0.47µF/25V

100nF/50V

470pF/1kV

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

17

Component List for 20W CFL

Part

Value

Resistor

Note

Part

Value

Note

Diode

R1

R2

R3

R4

R5

470kΩ

90kΩ

10Ω

1/4W

D1

D2

D3

D4

D5

D6

D7

1N4007

UF4007

1kV/1A

47Ω

1kV/1A

47Ω

1kV/1A,Ultra Fast

Capacitor

C1

C2

C3

C4

C5

C6

C7

22µF/250V

10µF/50V

Electrolytic Capacitor

Miller Capacitor

Inductor

2.5mH (280T)

MOSFET

FQPF1N50C

IC

L1

EE1616S

470nF/25V

100nF/25V

470pF/630V

33nF/630V

3.3nF/1kV

Miller Capacitor

Q1

Q2

500V,1A

Miller Capacitor

U1

FAN7711

Fairchild Semiconductor

Note:

3. Refer to the typical application circuit provided in Figure 1.

www.fairchildsemi.com

FAN7711 Rev. 1.0.3

18

Package Dimensions

8-SOP

Dimensions are in millimeters unless otherwise noted.

Figure 33. 8-Lead Small Outline Package (SOP)

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

19

Package Dimensions

8-DIP

Dimensions are in inches and [millimeters] unless otherwise noted.

Figure 34. 8-Lead Dual In-Line Package (DIP)

FAN7711 Rev. 1.0.3

www.fairchildsemi.com

20

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型号：	FAN7711N
厂家：	ONSEMI
描述：	电子镇流器控制器电子 PC 驱动控制器光电二极管接口集成电路
文件：	总23页 (文件大小：1524K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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