Fairchild FSD146MRBN service manual

FSD146MRBN
Green-Mode Fairchild Power Switch (FPS™)

FSD146MRBN — Green-Mode Fairchild Power Switch (FPS™)

October 2011

Features



Advanced Soft Burst-Mode Operation for
Low Standby Power and Low Audible Noise

 Random Frequency Fluctuation for Low EMI
 Pulse-by-Pulse Current Limit
 Various Protection Functions: Overload Protection

(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD) with Hysteresis, Output-Short
Protection (OSP), and Under-Voltage Lockout
(UVLO) with Hysteresis

 Low Operating Current (0.4mA) in Burst Mode
 Internal Startup Circuit
 Internal High-Voltage SenseFET: 650V
 Built-in Soft-Start: 15ms
 Auto-Restart Mode

Applications

Description

The FSD146MRBN is an integrated Pulse Width
Modulation (PWM) controller and SenseFET designed
for offline Switch-Mode Power Supplies (SMPS) with
minimal external components. The PWM controller
includes an integrated fixed-frequency oscillator, Under­Voltage Lockout (UVLO), Leading-Edge Blanking (LEB),
optimized gate driver, internal soft-start, temperature­compensated precise current sources for loop
compensation, and self-protection circuitry. Compared
with a discrete MOSFET and PWM controller solution,
the FSD146MRBN can reduce total cost, component
count, size, and weight; while simultaneously increasing
efficiency, productivity, and system reliability. This
device provides a basic platform that is well suited for
cost-effective design of a flyback converter.

Power Supply for LCD Monitor, STB, and



DVD Combination

Ordering Information

(2)

(4)

Open

Frame

Replaces

Device

(5)

Output Power Table

Part

Number

FSD146MRBN 8-DIP

Notes:

1. Lead-free package per JEDEC J-STD-020B.

2. The junction temperature can limit the maximum output power.

3. 230V

4. Typical continuous power in a non-ventilated enclosed adapter measured at 50C ambient temperature.

5. Maximum practical continuous power in an open-frame design at 50C ambient temperature.

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD146MRBN • Rev. 1.0.0

Package

or 100/115VAC with voltage doubler.

AC

Operating

Junction

Temperature

-40°C ~
+125°C

Current

Limit

1.50A

R

DS(ON)

(Max.)

2.6

230VAC ± 15%

Adapter

(4)

23W 35W 17W 26W FSFM260N

(3)

85-265VAC

Open

Frame

Adapter

(5)

Application Circuit

FSD146MRBN — Green-Mode Fairchild Power Switch (FPS™)

Internal Block Diagram

Figure 1. Typical Application Circuit

Figure 2. Internal Block Diagram

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD146MRBN • Rev. 1.0.0 2

Pin Configuration

Pin Definitions

FSD146MRBN — Green-Mode Fairchild Power Switch (FPS™)

Figure 3. Pin Configuration (Top View)

Pin # Name Description

1 GND

2 VCC

3 FB

4 N.C. No Connection

5, 6, 7, 8 Drain

Ground. This pin is the control ground and the SenseFET source.

Power Supply. This pin is the positive supply input, which provides the internal operating

current for both startup and steady-state operation.

Feedback. This pin is internally connected to the inverting input of the PWM comparator.
The collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor
should be placed between this pin and GND. If the voltage of this pin reaches 7.0V, the
overload protection triggers, which shuts down the FPS™.

SenseFET Drain. High-voltage power SenseFET drain connection.

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD146MRBN • Rev. 1.0.0 3

FSD146MRBN — Green-Mode Fairchild Power Switch (FPS™)

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.

Symbol Parameter Min. Max. Unit

V

Drain Pin Voltage 650 V

DS

V

V

CC

V

FB

I

Drain Current Pulsed 3.4 A

DM

I

Continuous Switching Drain Current

DS

EAS Single Pulsed Avalanche Energy

PD

T

J

T

STG

ESD

Notes:

6. Repetitive peak switching current when the inductive load is assumed: Limited by maximum duty (D

and junction temperature (see Figure 4).

7. L=45mH, starting T

8. Infinite cooling condition (refer to the SEMI G30-88).

9. Although this parameter guarantees IC operation, it does not guarantee all electrical characteristics.

Pin Voltage 26 V

CC

Feedback Pin Voltage

Total Power Dissipation (TC=25C)

Maximum Junction Temperature

Operating Junction Temperature

(9)

Storage Temperature

Electrostatic
Discharge Capability

=25C.

J

Human Body Model, JESD22-A114 5

Charged Device Model, JESD22-C101 2

T

=25C

(6)

C

TC=100C

(7)

250 mJ

(8)

-0.3

10.0 V

1.7 A

1.1 A

1.5 W

150

-40

-55

+125

+150

MAX

C

C

C

kV

=0.73)

Figure 4. Repetitive Peak Switching Current

Thermal Impedance

TA=25°C unless otherwise specified.

Symbol Parameter Value Unit

JA Junction-to-Ambient Thermal Impedance

JL Junction-to-Lead Thermal Impedance

Notes:

10. JEDEC recommended environment, JESD51-2, and test board, JESD51-10, with minimum land pattern.

11. Measured on the SOURCE pin #7, close to the plastic interface.

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD146MRBN • Rev. 1.0.0 4

(10)

85 °C/W

(11)

11 °C/W

FSD146MRBN — Green-Mode Fairchild Power Switch (FPS™)

Electrical Characteristics

TJ = 25C unless otherwise specified.

Symbol Parameter Conditions Min. Typ. Max. Unit

SenseFET Section

BV

Drain-Source Breakdown Voltage

DSS

I

Zero-Gate-Voltage Drain Current

DSS

R

Drain-Source On-State Resistance VGS=10V, ID =1A 2.1 2.6 

DS(ON)

C

Input Capacitance

ISS

C

Output Capacitance

OSS

tr Rise Time V

tf Fall Time V

t

Turn-On Delay V

d(on)

t

Turn-Off Delay V

d(off)

Control Section

f

Switching Frequency

S

f

D

MAX

D

MIN

Switching Frequency Variation

S

Maximum Duty Ratio V

Minimum Duty Ratio V

IFB Feedback Source Current V

V

START

V

STOP

t

S/S

V

RECOMM

UVLO Threshold Voltage

After Turn-On, V

Internal Soft-Start Time V

Recommended VCC Range 13 23 V

Burst-Mode Section

V

BURH

V

V

BURL

HYS

Burst-Mode Voltage V

0.30 0.35 0.40 V

150 mV

Protection Section

I

Peak Drain Current Limit

LIM

V

Shutdown Feedback Voltage V

SD

I

Shutdown Delay Current V

DELAY

t

Leading-Edge Blanking Time

LEB

V

Over-Voltage Protection VCC Sweep 23.0 24.5 26.0 V

OVP

t

OSP

V

OSP

t

OSP_FB

TSD

T

HYS

Output-Short

Threshold VFB 1.8 2.0 2.2 V

Protection

V

Thermal Shutdown Temperature

Hysteresis 60

V

CC

V

DS

(12)

V

(12)

V

(12)

V

(12)

DS

DS

DS

DS

DS

DS

CC

-25C < TJ < 125C ±5 ±10 %

CC

CC

FB

V

FB

STR

= 0V, ID = 250A

= 650V, TA = 25C

= 25V, V

= 25V, V

= 0V, f=1MHz 436 pF

GS

= 0V, f=1MHz 65 pF

GS

= 325V, ID = 4A, RG=25 24 ns

= 325V, ID = 4A, RG=25 24 ns

= 325V, ID = 4A, RG=25 13 ns

= 325V, ID= 4A, RG=25 30 ns

= 14V, V

= 14V, V

= 14V, V

= 4V 61 67 73 kHz

FB

= 4V 61 67 73 %

FB

= 0V 0 %

FB

= 0 65 90 115

= 0V, V

= 40V, V

Sweep 11 12 13 V

CC

= 0V 7.0 7.5 8.0 V

FB

Sweep 15 ms

CC

650 V

250

0.45 0.50 0.55 V

= 14V, VFB Sweep

CC

1.35 1.50 1.65 A

0.7 1.0 1.3

)

Threshold Time

(12)

FB

di/dt = 300mA/s

= 14V, V

CC

= 14V, V

(12,14)

CC

300 ns

Sweep 6.45 7.00 7.55 V

FB

= 4V 1.2 2.0 2.8

FB

OSP Triggered when

ON<tOSP

& VFB>V

t

Blanking Time 2.0 2.5 3.0

(Lasts Longer than t

Shutdown Temperature 125 135 145

(12)

OSP

OSP_FB

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© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD146MRBN • Rev. 1.0.0 5