SG6846LDZ - Fairchild - Datasheet.Live

November 2008

SG6846 • Rev. 1.3.1

SG6846 — Highly Integrated Green-Mode PWM Controller

SG6846

Highly Integrated Green-Mode PWM Controller

Features

 Low Startup Current: 8µA

 Low Operating Current: 3.7mA

 Peak-Current Mode of Operation with Cycle-by-

Cycle Current Limiting

 PWM Frequency Continuously Decreasing with

Burst Mode at Light Loads

 VDD Over-Voltage Protection (OVP)

 AC Input Brownout Protection with Hysteresis

 Constant Output-Power Limit (Full AC Input Range)

 Internal Latch Circuit for OVP, OTP, and OCP

 Two-level Over-Current Protection (OCP) with

96ms Delay Time

 Very Few External Components

 Programmable Over-Temperature Protection (OTP)

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

 Power Adapters

 Open-Frame SMPS

 SMPS with Surge-Current Output, such as for

Printers, Scanners, Motor Drivers

Description

The highly integrated SG6846 series of PWM

controllers provides several features to enhance the

performance of flyback converters. To minimize

standby-power consumption, a proprietary green-mode

function provides off-time modulation to continuously

decrease the switching frequency under light-load

conditions. Under zero-load conditions, the power

supply enters burst-mode. This completely shuts off

PWM output. The output restarts just before the supply

voltage drops below the under-voltage lockout (UVLO)

lower limit. This green-mode function enables power

supplies to meet international power conservation

requirements easily.

The SG6846 is designed especially for switch-mode

power supply (SMPS) with surge-current output. It is

incorporated with a two-level OCP function. Besides the

cycle-by-cycle current limiting, if the switching current is

higher than 2/3 of the peak-current threshold for a delay

time, OCP is activated such that the SG6846 is totally

shut down. Other protection functions include: AC-input

brownout protection with hysteresis and VDD OVP. For

OTP, an external NTC thermistor can be applied to

sense the ambient temperature. When OCP, VDD OVP,

or OTP are activated, an internal latch circuit is used to

latch off the controller. The latch resets when the VDD

supply is removed.

Other features of this controller include built-in

synchronized slope compensation and proprietary

internal compensation for constant output-power limit

over universal-AC-input range. Also, the gate output is

clamped at 18V to protect the external MOSFET from

over-voltage damage.

The SG6846 series controllers are available in both 8-

pin dual in-line (DIP) and small outline (SOP) packages.

Ordering Information

Part

Number

Operating Temperature

Range OTP Latch Eco Status Package Packing

Method

SG6846LSZ -20 to +85°C Yes RoHS 8-Pin SOP Tape & Reel

SG6846LSY -20 to +85°C Yes Green 8-Pin SOP Tape & Reel

SG6846LDZ -20 to +85°C Yes RoHS 8-Pin DIP Tube

SG6846LDY -20 to +85°C Yes Green 8-Pin DIP Tube

For Fairchild’s defini t i on of “green” Eco St atus, pleas e visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

SG6846 • Rev. 1.3.1 2

SG6846 — Highly Integrated Green-Mode PWM Controller

Typical Application

Figure 1. Typical Application

Block Diagram

Figure 2. Block Diagram

SG6846 • Rev. 1.3.1 3

SG6846 — Highly Integrated Green-Mode PWM Controller

Marking Information

SG6846FTP

XXXXXXXXYWWV

※ Marking for SG6846LSZ (Pb-free)

SG6846LDZ (Pb-free)

Figure 3. Top Mark 1

※ Marking for SG6846LSY (Green-compound)

SG6846LDY (Green-compound)

Figure 4. Top Mark 2

: Fairchild logo

Z: Plant Code

X: Year Code

Y: Week Code

TT: Die Run Code

F: L = OCP Latch

T: Package Type (D = DIP, S = SOP)

P: Y = Green Package

M: Manufacturing Flow Code

F: L = OTP Latch

T: D = DIP, S = SOP

P : Z = Lead Free + ROHS Compatible

Null = Regular Package

XXXXXXXX: Wafer Lot

Y: Year; WW: Week

V: Assembly Location

SG6846 • Rev. 1.3.1 4

SG6846 — Highly Integrated Green-Mode PWM Controller

Pin Configuration

Figure 5. Pin Configuration

Pin Definitions

Pin # Name Function Description

1 GND Ground

Ground.

2 FB Feedback

The signal from the external compensation circuit is fed into this pin. The FB

pin and the current-sense signal from Pin 6 determine the PWM duty cycle.

3 VIN

Line-Voltage

Detection

Line-voltage detection. The line-voltage detection is used for brownout

protection with hysteresis. Constant-output-power limit over universal-AC-input

range is also achieved using the VIN signal. It is suggested to add low-pass

filter to filter out line ripple on bulk capacitor.

4 RI Reference

Setting

A resistor from the RI pin to ground generates a reference current source

inside SG6846. This determines the switching frequency. Increasing the

resistance reduces the switching frequency. Using a 26kΩ resistor RI results in

a 65KHz switching frequency.

5 RT

Temperature

Detection

For OTP. An external negative temperature coefficient (NTC) thermistor is

connected from this pin to the GND pin. The impedance of the NTC decreases

at high temperatures. Once the voltage of the RT pin drops below a threshold,

PWM output is disabled.

6 SENSE Current Sense

Current sense. The sensed voltage is used for peak-current-mode control and

cycle-by-cycle current limiting. If the switching current is higher than 2/3 of the

peak-current threshold for longer than 96ms, OTP is activated. This two-level

OCP feature is especially suitable for SMPS with surge current output.

7 VDD Power Supply

Power Supply. The internal protection circuit disables PWM output in

response to VDD over voltage.

8 GATE Driver Output

The totem-pole output driver for the power MOSFET. A soft driving waveform is

implemented for improved electromagnetic interference (EMI).

SG6846 • Rev. 1.3.1 5

SG6846 — Highly Integrated Green-Mode PWM Controller

Absolute Maximum Ratings

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

operable above the recommended operating conditions and stressing the parts to these levels is not recommended.

In addition, extended exposure to stresses above the recommended operating conditions may affect device

reliability. The absolute maximum ratings are stress ratings only. All voltage values, except differential voltages, are

given with respect to GND pin.

Symbol Parameter Min. Max. Unit

VDD Supply Voltage 25 V

VL Input Voltage to FB, SENSE, VIN, RT, RI Pins -0.3 7.0 V

SOP 400

PD Power Dissipation DIP 800

mW

SOP 41.2

RΘJC Thermal ResistanceJunction-to-Case) DIP 67.1

°C/W

TJ Operating Junction Temperature -40 +125 °C

TSTG Storage Temperature Range -65 +150 °C

TL Lead Temperature, Wave Soldering, 10 Second +260 °C

Human Body Model, JESD22-A114 2.0 kV

ESD Machine Model, JESD22-A115A 200 V

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended

operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not

recommend exceeding them or designing to Absolute Maximum Ratings.

Symbol Parameter Min. Max. Unit

TA Operating Ambient Temperature -20 +85 °C

SG6846 • Rev. 1.3.1 6

SG6846 — Highly Integrated Green-Mode PWM Controller

Electrical Characteristics

VDD = 15V and TA = 25°C unless otherwise noted.

Symbol Parameter Conditions Min. Typ. Max. Unit

VDD Section

VDD-OP Continuously Operating Voltage 20 V

VDD-ON Turn-On Threshold Voltage 15.5 16.5 17.5 V

VDD-OFF Turn-Off Voltage 9.5 10.5 11.5 V

VDD-TH-G Low-Threshold Voltage for VDD to Exit

Green-OFF Mode

VDD-OFF

+1.25V V

VDD-LH Threshold Voltage for Latch-Off Release 3 4 5 V

IDD-ST Startup Current VDD-ON – 0.16V 8 30 µA

IDD-OP Operating Supply Current GATE Open 3.7 5.0 mA

VDD-OVP V

DD Over-Voltage Protection (Latch Off) 22.6 23.6 24.6 V

tD-VDDOVP V

DD OVP Debounce Time RI = 26kΩ 100 µs

IDD-H V

DD OVP Latch-Off Holding Current VDD = 5V, TA=27 oC 45 µA

VIN Section

VIN-OFF PWM Turn-Off Threshold Voltage 0.67 0.72 0.77 V

VIN-ON PWM Turn-On Threshold Voltage V

IN-OFF

+0.20

V

Feedback Input Section

AV Input-Voltage to Current-Sense Attenuation 1/4.2 V/V

ZFB Input Impedance 4.0 5.5 7.0 kΩ

VFBO FB-Pin Open Voltage 6.2 V

Current Sense Section

ZSENSE Input Impedance 12 kΩ

tPD Delay to Output 100 200 ns

tLEB Leading-Edge Blanking Time 360 ns

VSTH1V Threshold Voltage for Current Limit VIN = 1V, RI = 26kΩ 0.78 0.83 0.88 V

VSTH3V Threshold Voltage for Current Limit VIN = 3V, RI = 26kΩ 0.65 0.70 0.75 V

VSTH1V-2/3 OCP Threshold Voltage for Current Limit VIN = 1V, RI = 26kΩ 0.56 0.61 0.66 V

VSTH3V-2/3 OCP Threshold Voltage for Current Limit VIN = 3V, RI = 26kΩ 0.46 0.51 0.56 V

tD-OCP Delay Time for OTP RI = 26kΩ 82 96 110 ms

Continued on following page…

SG6846 • Rev. 1.3.1 7

SG6846 — Highly Integrated Green-Mode PWM Controller

Electrical Characteristics (Continued)

VDD = 15V and TA = 25°C unless otherwise noted.

Symbol Parameter Conditions Min. Typ. Max. Unit

Oscillator Section

fOSC Normal PWM Frequency RI = 26kΩ 60 65 70 KHz

fOSC-G Green-Mode Minimum Frequency RI = 26kΩ 18.0 22.5 25.0 KHz

VFB-N FB-Pin Threshold for the Beginning of Green

Mode 2.1 V

VFB-G Green-OFF-Mode Voltage at FB Pin 1.6 V

SG Slope for Green-Mode Modulation RI = 26kΩ 85 Hz/mV

fDV Frequency Variation vs. VDD Deviation VDD = 11.5V to 20V 5 %

fDT Frequency Variation vs. Temperature

Deviation TA = -20 to 85°C 1.5 5.0 %

Continued on following page…

f

OSC

:65KHz

f

OSC -GREEN

:22.5KHz

VV

FB -NFB -G FB

V

F r equen cy

PW M

F r equen cy

f

OSC -OFF

:0Hz

Figure 6. PWM Frequency

SG6846 • Rev. 1.3.1 8

SG6846 — Highly Integrated Green-Mode PWM Controller

Electrical Characteristics (Continued)

VDD = 15V and TA = 25°C unless otherwise noted.

Symbol Parameter Conditions Min. Typ. Max. Unit

PWM Output Section

DCYMAX Maximum Duty Cycle 80 85 90 %

VOL Output Voltage Low VDD = 15V,

IOUT = 50mA 1.5 V

VOH Output Voltage High VDD = 12V,

IOUT = 50mA 8 V

tr Rising Time VDD = 15V,

GATE = 1nF 350 ns

tf Falling Time VDD = 15V,

GATE = 1nF 50 ns

VCLAMP Gate Output Clamping Voltage VDD = 20V 18 V

OTP Section

IRT Output Current of RT Pin RI = 26kΩ 64 70 76 µA

VRTTH Threshold Voltage for OTP 1.015 1.065 1.115 V

tDOTP-LATCH Over-Temperature Latch-Off Debounce RI = 26kΩ 100 µs

VRT-RLS OTP Release Voltage

(for Non-Latch-Off Version)

VRTTH +

0.1 V

RI Section

RINOR RI Operating Range 15.5 36.0 kΩ

RIMAX Maximum RI Value for Protection 216 kΩ

RIMIN Minimum RI Value for Protection 6 kΩ

SG6846 • Rev. 1.3.1 9

SG6846 — Highly Integrated Green-Mode PWM Controller

Typical Performance Characteristics

15.5

16.0

16.5

17.0

17.5

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C))

V

TH -ON

(V)

9.5

9.7

9.9

10.1

10.3

10.5

10.7

10.9

11.1

11.3

11.5

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C)

V

TH -O FF

(V)

Figure 7. Startup Threshold vs. Temperature Figure 8. Minimum Operating Voltage

vs. Temperature

13.500

14.000

14.500

15.000

15.500

16.000

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C)

I

DD-ST

(µA)

0

4

8

12

16

20

5 7 9 1113151719

VDD (V)

I

DD-ST

(µA)

Figure 9. Startup Current vs. Temperature Figure 10. Startup Current vs. VDD Voltage

0.400

0.500

0.600

0.700

0.800

0.900

1.000

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C))

V

IN-OFF

(V)

0.400

0.500

0.600

0.700

0.800

0.900

1.000

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C)

V

IN-ON

(V)

Figure 11. PWM Turn-Off Threshold Voltage

vs. Temperature

Figure 12. PWM Turn-On Threshold Voltage

vs. Temperature

SG6846 • Rev. 1.3.1 10

SG6846 — Highly Integrated Green-Mode PWM Controller

Typical Performance Characteristics (Continued)

64.600

64.700

64.800

64.900

65.000

65.100

65.200

65.300

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C)

f

OSC

(KHz)

0

20

40

60

1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3

V

FB

(V)

PWM Frequency (KHz)

Figure 13. PWM Frequency vs. Temperature Figure 14. PWM Frequency vs. FB Voltage (RI=26kΩ)

0

0.2

0.4

0.6

0.8

1

11.522.53

V

IN

(V)

V

TH -P

(V)

0

0.2

0.4

0.6

0.8

1

11.522.53

V

IN

(V)

V

TH -O

(V)

Figure 15. Current-Limit Threshold vs. VIN Voltage Figure 16. 2/3 Current-Limit Threshold vs. VIN Voltage

70.000

71.000

72.000

73.000

74.000

75.000

76.000

77.000

78.000

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C)

I

RT

(µA)

1.015

1.035

1.055

1.075

1.095

1.115

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature (°C)

V

OTP-OFF

(V)

Figure 17. Output Current of RT Pin (IRT)

vs. Temperature

Figure 18. OTP Threshold Voltage vs. Temperature

SG6846 • Rev. 1.3.1 11

SG6846 — Highly Integrated Green-Mode PWM Controller

Operation Description

Startup Operation

The turn-on/turn-off thresholds are fixed internally at

16.5V/10.5V. To enable the SG6846 during startup, the

hold-up capacitor must first be charged to 16.5V

through the startup resistor.

The hold-up capacitor continues to supply VDD before

energy can be delivered from the auxiliary winding of

the main transformer. The VDD must not drop below

10.5V during this startup process. This UVLO hysteresis

window ensures that the hold-up capacitor can

adequately supply VDD during startup.

The typical startup current is only 8μA. This allows a

high resistance, low-wattage startup resistor to be used

to minimize power loss. A 1.5MΩ/0.25W, startup

resistor and a 10µF/25V VDD hold-up capacitor is

sufficient for a universal input range.

The required operating current has been reduced to

3.7mA. This enables higher efficiency and reduces the

VDD hold-up capacitance requirement.

Green-Mode Operation

Power supplies using the SG6846 can easily meet even

the most restrictive international regulations regarding

standby power consumption. The proprietary green-mode

function provides off-time modulation to continuously

decrease the switching frequency under light-load

conditions. Maximum on time is limited to provide

protection against abnormal conditions. To further reduce

power consumption under zero-load condition, the PWM

oscillator is completely turned off and the power supply

enters burst-mode. After the PWM oscillator is turned off,

the IC’s supply voltage VDD drops gradually. Before the VDD

voltage drops below the UVLO threshold, the PWM

oscillator is turned on again. This green-mode function

dramatically reduces power consumption under light-load

and zero-load conditions.

Oscillator Operation

A resistor connected from the RI pin to GND generates

a reference-current source inside the SG6846. This

current is used to determine the PWM frequency.

Increasing the resistance decreases the amplitude of

the current source and reduces the PWM frequency.

Using a 26kΩ resistor RI results in a corresponding

65KHz switching frequency. The relationship between

RI and the switching frequency is:

)(k

1690

(KHz)

Ω

=

I

PWM R

f (1)

If an open circuit or short circuit to ground occurs at the

RI pin, the internal protection circuit immediately shuts

down the controller.

Two-Level Over-Current Protection (OCP)

Cycle-by-cycle current limiting shuts down the PWM

immediately when the switching current is over the

peak-current threshold. Additionally, when the switching

current is higher than 2/3 of the peak-current threshold,

the internal counter starts counting up. When the

switching current is lower than 2/3 of the peak current

threshold, the internal counter counts down. When the

total accumulated counting time is more than about

96ms (RI = 26kΩ), the controller is latched off.

The two-level OCP protection and up/down counter are

especially designed for SMPS with surge current output

such as those for printers, scanners, and motor drivers.

Constant-Output-Power Limit

For constant-output-power limit over universal input-

voltage range, the peak-current threshold is adjusted by

the voltage of the VIN pin. Since the VIN pin is connected

to the rectified AC-input line voltage through the resistive

divider, a higher line voltage generates a higher VIN

voltage. The threshold voltage decreases as the VIN

voltage increases, making the maximum output power at

high-line input voltage equal to that at low-line input.

Brownout Protection

Since the VIN pin is connected through a resistive divider

to the rectified AC input line voltage, it can also be used

for brownout protection. If the VIN voltage is less than

0.72V, the PWM output is shut off. If the VIN voltage is

over 0.92V, the PWM output is turned on again. The

hysteresis window for ON/OFF is around 0.2V.

VDD Over-Voltage Protection (OVP)

VDD OVP is built in to prevent damage. If VDD is over

23.6V, SG6846 is latched off.

Over-Temperature Protection (OTP)

An external NTC thermistor can be connected from the

RT pin to GND. The impedance of the NTC decreases

at high temperatures. When the voltage of the RT pin

drops below 1.05V, the SG6846 is turned off. For

protection-mode options, see Ordering Information.

SG6846 • Rev. 1.3.1 12

SG6846 — Highly Integrated Green-Mode PWM Controller

Operation Description (Continued)

Noise Immunity

Noise from the current sense or the control signal may

cause significant pulse-width jitter, particularly in

continuous-conduction mode. Slope compensation

helps alleviate this problem. Good placement and

layout practices should be followed. Avoid long PCB

traces and component leads. Compensation and filter

components should be located near the SG6846.

Figure 19. Current Sense R-C Filter

SG6846 • Rev. 1.3.1 13

SG6846 — Highly Integrated Green-Mode PWM Controller

Reference Circuit

F1

21

+C2

R16

21

+C12

21

+C13

FB

P16V P32V

P16V

CX1 32V

RI

4

VIN

3

FB

2

GND

1

RT 5

SENSE 6

VDD 7

GATE 8

U1

12

34

LF2

21

+C3

21

+

C5

1 2

3 4

LF1

VZ1

t

RT1

R1 R2

R3

R4

R12 C4

21 D2

C6

21 D1

12

43

U2

R18

R15

R20

A K

R

U3 R21

R19

C9

1

3

2

D4

R7

R13

R14

1

23

Q1

L1

C7

2

1

3

4

BD1

5

1

7 9

11

13

3

610

TX1

R17

21

+C14

21

+C15

16V

C11

1

3

2

D5

L2

P32V

P16V

21 D3

1 2

L4

R8

R9

R5

21

+

C1

R6

R10

NTC1

CX2

P1

P2

FB

1 2

L3

21

+

C16

21

+

C17

CY1

CY2

P7

R11

FB

16V

32V

P32V

P16V

P32VP16V

P16V

Figure 20. Application Circuit for 32V / 16V Output

BOM

Part No. Value Part No. Value Part No. Value

R1, R2, R3, R4 470KΩ +/-5% C4 103 P 630V D3 FR103 1.0A 200V

R8, R9 S1MΩ +/-1% C10,C11 102 P 1KV BD1 DBL406G

R5 16K2Ω +/-1% C6,C7 102 P 50V D4 BYT28-300

R15 1K5Ω +/-5% C9 222 P 50V D5 BYV32-150

R13 10Ω +/-5% C14,C17 470µ 25V F1 250V4A QUICK

R18 4K7Ω +/-5% C15 220µ 25V L1,L2 1.8µH

R21 15KΩ +/-1% C13,C16 220µ 50V L4 10µH

R7 27KΩ +/-5% C2 150µ 400V U3 TL431 +/-1%

R6 330Ω +/-1% C1 4.7µ 50V U1 SG 6846

R19 102KΩ +/-1% C3 10µ 50V U2 PC817

R14 0Ω22 +/-5% CX1 X1 0.47µ 275V Q1 7NB60

R16, R17 1W 20Ω +/-5% C8 Y2 222P 250V TX1 EI-33

R11 20KΩ +/-5% C5 100µ 50V RT1 SCK053

R12 100KΩ +/-5% CX2 X2 0.1µF 275V VZ1 14ψ 470V

R20 887KΩ +/-1% D1 1N4148

R22 10KΩ +/-1% D2 BYV95C

SG6846 • Rev. 1.3.1 14

SG6846 — Highly Integrated Green-Mode PWM Controller

Physical Dimensions

5.08 MAX

0.33 MIN

2.54

7.62

0.56

0.355

1.65

1.27

3.683

3.20

3.60

3.00

6.67

6.096

9.83

9.00

7.62

9.957

7.87

0.356

0.20

NOTES: UNLESS OTHERWISE SPECIFIED

A) THIS PACKAGE CONFORMS TO

JEDEC MS-001 VARIATION BA

B) ALL DIMENSIONS ARE IN MILLIMETERS.

C) DIMENSIONS ARE EXCLUSIVE OF BURRS,

MOLD FLASH, AND TIE BAR EXTRUSIONS.

D) DIMENSIONS AND TOLERANCES PER

ASME Y14.5M-1994

8.255

7.61

E) DRAWING FILENAME AND REVSION: MKT-N08FREV2.

(0.56)

Figure 21. 8-Pin Dual In-Line Package (DIP)

Pack age drawings are provided as a service to customers consideri ng Fai rchild components . Drawings may c hange i n any manner

without notice. P l ease note the revi sion and/or date on t he drawing and contac t a Fairchild S emiconductor representative to verify

or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically

the warranty therein, which covers Fairchild products.

Always visit Fairchild Semiconductor’ s online packaging area for the most recent package drawings:

http://www.fairchildsemi.com/packaging/.

SG6846 • Rev. 1.3.1 15

SG6846 — Highly Integrated Green-Mode PWM Controller

Physical Dimensions

8°

0°

SEE DETAIL A

NOTES: UNLESS OTHERWISE SPECIFIED

A) THIS PACKAGE CONFORMS TO JEDEC

MS-012, VARIATION AA, ISSUE C,

B) ALL DIMENSIONS ARE IN MILLIMETERS.

C) DIMENSIONS DO NOT INCLUDE MOLD

FLASH OR BURRS.

D) LANDPATTERN STANDARD: SOIC127P600X175-8M.

E) DRAWING FILENAME: M08AREV13

LAND PATTERN RECOMMENDATION

SEATING PLANE

0.10 C

C

GAGE PLANE

x 45°

DETAIL A

SCALE: 2:1

PIN ONE

INDICATOR

4

8

1

C

MBA0.25

B

5

A

5.60

0.65

1.75

1.27

6.20

5.80

3.81

4.00

3.80

5.00

4.80

(0.33)

1.27

0.51

0.33

0.25

0.10

1.75 MAX 0.25

0.19

0.36

0.50

0.25

R0.10

0.90

0.406 (1.04)

OPTION A - BEVEL EDGE

OPTION B - NO BEVEL EDGE

Figure 22. 8-Pin Small Outline Package (SOP)

Pack age drawings are provided as a service to customers consideri ng Fai rchild components . Drawings may c hange i n any manner

without notice. P l ease note the revi sion and/or date on t he drawing and contac t a Fairchild S emiconductor represent ative to v er ify

or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically

the warranty therein, which covers Fairchild products.

Always visit Fairchild Semiconductor’ s online packaging area for the most recent package drawings:

http://www.fairchildsemi.com/packaging/.

SG6846 • Rev. 1.3.1 16

SG6846 — Highly Integrated Green-Mode PWM Controller