Datasheet KA7525B Datasheet (Fairchild Semiconductor)

©2002 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev.1.0.1

Features

• Internal Start-up Timer

• Internal Current Sense Blanking Which Eliminates the
Need for an External R/C filter

• Overvoltage Comparator Eliminates Runaway Output
Voltage

• Zero Current Detector

• One Quadrant Multiplier

• Trimmed 1.5% Internal Bandgap Reference

• Under Voltage Lock Out with 2.1V of Hysteresis

• Totem Pole Output with High State Clamp

• Low Start-up and Operating Current

• 8-Pin DIP or 8-Pin SOP.

Applications

• Electronic Ballast

•SMPS

Description

The KA7525B provides simple and high perform ance activ e
power factor correction. KA7525B is optimized for
electronic ballast and low power, high density power
supplies requiring a minimum board area, reduced
component count and low power dissipation. Addition of
internal current sense blanking (In ternal R,C) eliminates the
need for an external R/C filter. Internal clamping of the error
amplifier and multiplier outputs improves turn on overshoot
characteristics and current limiting. Special circuitry has also
been added to pr event no load runawa y conditions. Outpu t
drive clamps limiting power MOSFET gate drive
independent of supply voltage greatly enhance the products
practical application.

KA7525B

KA7525BKA7525B

KA7525B

Po wer Factor Correction Controller

Po wer Factor Correction ControllerPo wer Factor Correction Controller

Po wer Factor Correction Controller

8-DIP

8-SOP

1

1

KA7525B

2

Pin Assignments

Pin Definitions

Pin Number Pin Name Pin Function Description

1 INV

Inverting input of the error amplifier. The output of the Boost converter
should be resistively divided to 2.5V and connected to this pin.

2EA_OUT

The output of the error amplifier. A feedback compensation network is
placed between this pin and the INV pin.

3MULT

Input of the multiplier stage. The full-wave rectified AC is divided to less
than 2V and is connected to this pin.

4CS

Input of the PWM comparator. Current is sensed in the Boost stage
MOSFET by a resistor in the source lead. An internal leading edge
blanking circuitry has been included to reject any high frequency noise
present on the current waveform.

5 Idet

The zero current detector senses the inductor current by monitoring
when the Boost inductor auxiliary winding voltage falls below 1.8V.

6 GND The ground potential of all the pins.
7OUT

The output of a high current power driver capable of driving the gate of a
power MOSFET.

8 Vcc The logic and control power supply connection.

1

2

3

45

6

7

8INV

EA OUT

MULT

CS

Vcc

OUT

GND

Idet

(Top View)

KA7525B

3

Internal Block Diagram

Absolute Maximum Ratings

Temperature Characteristics (0°°°°C ≤

≤ ≤

≤ Ta ≤

≤ ≤

≤ 125°°°°C )

Parameter Symbol Value Unit

Supply Voltage V

CC

30 V
Peak Drive Output Current Ioh, IoI ±500 mA
Driver Output Clamping Diodes

V

O

> VCC or VO < -0.3V

Iclamp ±10 mA

Detector Clamping Diodes Idet ±10 mA
Error Amp, Multiplier and Comparator Input Voltage Vin -0.3 to 6 V
Operating Temperature Range Topr 0 to 125 °C
Storage Temperature Range Tstg -65 to 150 °C
Power Dissipation Pd 0.8 W
Thermal Resistance (Junction-to-Air) Rθja 100 °C/W

Characteristics Symbol Value Unit

Temperature Stability for Reference Voltage(Vref) ∆Vref (Typ) 20 mV
Temperature Stability for Multiplier Gain(K) ∆K/∆T (Typ) -0.2 %/°C

8

7

5

4

3

1

62

2.5V Ref
Internal

Bias

OUT

INV

EA OUT

GND

MULT

CS

Idet

Vcc

Timer R

R,C Filter

Vref

Vea(-)

Error Amp

Vm2

Vref ~ Vref+1V

Multiplier

0 ~2V

Vm1

Vmo

Drive
Output

Over Voltage
Protection

1.8V

+

-

Current Sense
Comparator

Vref

Zero Current
Detector

240mV

Vcc

1.8V

7.5V

1.24V

10V

36V

2.1V

+

_

+
_

-

+

+

_

+
_

UVLO

Q

R

S

K =

Vm1× (Vm2-Vref)

Pin4 Threshold(Vmo)

KA7525B

4

Electrical Characteristics

Unless otherwise specified, these specifications apply over the operating ambient temperatures for the KA7525B
with 0°C ≤

Ta ≤

125°C and Vcc=12V.

Parameter Symbol Conditions Min. Typ. Max. Unit
UNDER VOLTAGE LOCK OUT SECTION

Start Threshold Voltage V

th (st)

Vcc Increasing 9 10 11 V

UVLO Hysteresis H

Y(st)

-1.72.12.5V

Supply Zener Voltage Vz Icc=10mA 30 36 - V

SUPPLY CURRENT SECTION

Start-Up Supply Current Ist Vcc < Vth(st) - 0.2 0.3 mA
Operating Supply Current Icc No Output Switching - 4 8 mA
Dynamic Operating Supply Current Idcc 50kHz, CI =1nF - 5 10 mA

ERROR AMPLIFIER SECTION

Voltage Feedback Input Threshold Vref

Iref=0mA 2.465 2.5 2.535 V
0°C ≤ Ta ≤ 125°C 2.44 - 2.56 V

Line Regulation

∆

Vref1 12V ≤ Vcc ≤ 25V - 0.1 10 mV

Load Regulation

(Note1)

∆

Vref2 0mA ≤ Iref ≤ 2mA - 0.1 10 mV

Temperature Stability of Vref

(Note2)

∆

Vref3 0°C ≤ Ta ≤ 125°C-20-mV

Input Bias Current Ib(ea) - -0.5 - 0.5

µ

A
Output Source Current Isource Vm2=3V -2 -4.5 - mA
Output Sink Current Isink Vm2=2V 3 4.5 - mA
Output Voltage Range

(Note2)

∆

Veao No Load on EA Out 1.2 - 3.6 V

Slew Rate (Note2) SR - - 0.6 - V/µs

MULTIPLIER SECTION

Input Bias Current(Pin3) Ib(m) - -0.5 - 0.5

µ

A
M1 Input Voltage Range (Pin3)

∆

Vm1 - 0 - 2 V

M2 Input Voltage Range (Pin2)

∆

Vm2 - Vref - Vref+1 V
Multiplier Gain(Note3) K Vm1=1V, ∆Vm2= 2.7 to 3.3V 0.55 0.68 0.8 1/V
Maximum Multiplier Output Voltage Vomax(m) Vea(-) = 0V, Vm1=2V 1.1 1.24 1.45 V
Temperature Stability of K (Note2)

∆K/∆

T0°C ≤ Ta ≤ 125°C--0.2-%/

°

C

KA7525B

5

Electrical Characteristics

(Continued)

Notes :

1. Because the reference is no t b rou gh t out externally, this specification cann ot b e tested on the packa ge pa rt. It is guaranteed
by design.

2. These parameters, although guaranteed, are not 100% tested in production.

3. K =

Parameter Symbol Conditions Min. Typ. Max. Unit
CURRENT SENSE SECTION

Input Offset Voltage (Note2) Vio(cs) Vm1 = 0V, Vm2 = 2.2V -10 3 10 mV
Input Bias Current Ib(cs) 0V ≤ Vcs ≤ 1.7V -1 -0.3 1

µ

A

Current Sense Delay to Output (Note2) td(cs) - - 200 500 ns

ZERO CURRENT DETECT SECTION

Detect Input Threshold Vth(det) Vdet Increasing 1.65 1.8 1.95 V
Detect Hysteresis HY(det) - 180 240 300 mV
Input Low Clamp Voltage Vclamp(I) Idet = -100uA 0.45 0.75 1 V
Input High Clamp Voltage Vclamp(h) Idet = 3mA 6.7 7.5 8.3 V
Input Bias Current Ib(det) 1V ≤ Vdet ≤ 6V -1 -0.2 1

µ

A

Input High/Low Clamp Diode
Current(Note2)

Iclamp(d) - - -

±

3mA

OUTPUT DRIVER SECTION
Output Voltage High Voh I

O

= -10mA, V

CC

= 12V 8.5 9 - V

Output Voltage Low Vol I

O

= 10mA, V

CC

= 12V - 0.8 1 V
Rising Time(Note2) tr CI = 1nF - 130 200 ns
Falling Time(Note2) tf CI = 1nF - 50 120 ns
Maximum Output Voltage Vomax(o) V

CC

= 20V 12 13 15 V

Output Voltage With UVLO Activated Vomin(o) V

CC

= 5V, IO = 100µA--1V
RESTART TIMER SECTION
Restart Time Delay td(rst) Vm1 = 1V, Vm2 = 3.5V - 300 -

µ

s

OVER VOLTAGE PROTECTION SECTION

Voltage Feedback Input Threshold Vth(ovp) Vcs= -0.5V, Vm1=1V , Vdet=0V 1.7 1.8 1.9 V

Pin4 Threshold

Vm1×(Vm2-Vref)

(Vm1=Vpin3, Vm2=Vpin2)

KA7525B

6

Typical Performance Characteristics

2.5 3.0 3.5 4.0 4.5

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6
Vm1=2.5V

Vm1=2.0V

Vm1=1.5V

Vm1=1.0V

Vm1=0.5V

Vm1=3.0V

Vm1=0V

C.S. Threshold Voltage[V]

E.A. Output Voltage[V]

0.0 0.5 1.0 1.5 2.0 2.5 3.0

-0 . 2

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4
Veao=3. 75V

Veao=3. 5V

Veao=4. 0V

Veao=3. 25V

Veao=3. 0V

Veao=2. 75V

Veao=2. 5V

C.S. Threshold Voltage[V]

Multiplier Input Voltage[V]

0 5 10 15 20 25 30 35 40 45

0.00

2.50m

5.00m

7.50m

10.00m

12.50m

15.00m

17.50m

20.00m

Supply Current[A]

Supply Voltage[V]

-20 0 20 40 60 80 100 120 140

2.45

2.46

2.47

2.48

2.49

2.50

2.51

2.52

Reference Voltage[V]

Temperature['C]

-20 0 20 40 60 80 100 120 140

9.4

9.5

9.6

9.7

9.8

9.9

10.0

10.1

10.2

Start-up Threshold[V]

Ambient Temperature['C]

-20 0 20 40 60 80 100 120 140

1.7

1.8

1.9

2.0

2.1

2.2

2.3

2.4

2.5

VU Lockout Hysteresis[V]

Ambient Temperature['C]

Figure 1. E.A. Output Voltage vs C.S. Thre shold

Figure 2. Multiplier Input Voltage vs C.S. Threshold

Figure 3. Supply Current vs Supply Voltage

Figure 4. Reference Voltage vs Temperature

Figure 5. Start-up Threshold vs Temperature

Figure 6. UV Lockout Hysteresis vs Temperature

KA7525B

7

Typical Performance Characteristics

(Continued)

-20 0 20 40 60 80 100 120 140

0

50

100

150

200

250

300

Start-up Supply Current[uA]

Temperature['C]

-20 0 20 40 60 80 100 120 140

-10

-9

-8

-7

-6

-5

-4

-3

-2

E.A. Source Current[mA]

Temperature['C]

-20 0 20 40 60 80 100 120 140

0

1

2

3

4

5

6

7

8

9

10

E.A. Sink Current[mA]

Temperature['C]

-20 0 20 40 60 80 100 120 140

-0.5

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

0.5

E .A. Input Bias Current[mA]

Temperature['C]

-20 0 20 40 60 80 100 120 140

0.50

0.55

0.60

0.65

0.70

0.75

0.80

Multiplier Gain[1/V]

Temperature['C]

-20 0 20 40 60 80 100 120 140

1.65

1.70

1.75

1.80

1.85

1.90

1.95

Idet Threshold High[V]

Temperature['C]

Figure 7. Start-up Supply Current vs Temperature Figure 8. E.A. Source Current vs Temperature

Figure 9. E.A. Sink Current vs Temperature

Figure 10. E.A. Input Bias Current vs Temperature

Figure 11. Multiplier Gain vs Temperature

Figure 12. Idet Threshold High vs Temperature

KA7525B

8

Typical Performance Characteristics

(Continued)

-20 0 20 40 60 80 100 120 140

1.10

1.15

1.20

1.25

1.30

1.35

1.40

1.45

Maximum Mult. Output Voltage[V]

Temperature

-20 0 20 40 60 80 100 120 140

0

50

100

150

200

250

300

Id et Input Hysteresis[mV]

Temperature['C]

-20 0 20 40 60 80 100 120 140

0

100

200

300

400

500

600

Restart Time[ uS]

Temperature['C]

-20 0 20 40 60 80 100 120 140

0

20

40

60

80

100

120

140

160

180

200

Rise Time[nS]

Temperature['C]

-20 0 20 40 60 80 100 120 140

0

10

20

30

40

50

60

70

80

90

100

110

120

Fall Time[nS ]

Temperature['C]

-20 0 20 40 60 80 100 120 140

0

1

2

3

4

5

6

7

8

Supply Current[mA]

Temperature['C]

Figure 13. Idet Input Hysteresis vs Temperature

Figure 14. Rest art Time vs Temperature

Figure 15. Max. Mult. Output Voltage vs Temperature

Figure 16. Rise Time vs Temperature

Figure 17. Fall Time vs Temperature Figure 18. Supply Current vs Te mperature

KA7525B

9

Operating Description

KA7525B is high performance, critical conduction, curr ent-mode power factor controller specifically designed for use in off
line active preconverters with minimal external components. This device provides the necessary features required to
significantly enhance poor power factor loads by keeping the ac line current sinuosity and in phase with the line voltage.
KA7525B contains many of the building blocks and protection features that are employed in modern high performance current
mode power supply controllers. A description of each of the function blocks is given below.

START-UP

An Under Voltage Lockout comp ara tor has been incorp orated to guarantee tha t IC is fully fun ctional before en able the output
stage. The positive power supply terminal (Vcc) is monitored by the UVLO comparator with the upper thresh old set at 10V
and the lower threshold at 7.9V. In the stand-by mode, with Vcc at 9.5V, the required supply current is less than 0.2mA. This
large hysteresis and low start-up current allow the implementation of efficient bootstrap start-up techniques, making this
device ideally suited for wide range off-line preconverter applications.

Fig.1.1 shows the start-up circuit. Circuit operation is as follows:
The start-up capacitor (Cst) is charged by current through start-up resistor (R st) minus the start-up current drawn by the IC.
Once the capacitor voltage reaches the start-up th reshold, the IC turns on, starting the switchin g of the MOSFET. The opera­tion of the IC demands an increase in operating current which results in discharging the capacitor. Before the start-up capacitor
voltage is discharged below hysteresis voltage, the auxiliary winding voltage takes over as the supply voltage as shown in Fig.

1.2.

AC
input

KA7525/B

Vcc

Out

DVcc

Rst

Cst

+

B

t

Vstart

Cst discharges

Hysteresis

Cst charges

from Rst

Vcc

Figure 1.1 Start-up Circuit

Figure 1.2 Start-up Capacitor Voltage

KA7525B

10

Error Amplifier

An Error Amplifier with access to the inverting input and output is provided. The noninverting input is internally biased at

2.5V and is not pinned out. The output voltage of the power factor converter is typically divided down and monitored by the
inverting input. The error amp output is internally connected to the multiplier and is pinned out for external loop compensa­tion. Typically, the bandwidth is set below 20Hz, so that the amplifer’s output voltage is relatively constant over a given ac line
cycle. In effect, the error amp monitors the average output voltage of the converter over several line cycles. Input bias cur­rent(0.5uA, max) can cause an output voltage error that is equal to the product of the input bias current and the value of the
upper divider resistor, R1 in Fig. 2.1.

Over Voltage Protection

The low bandwidth (typically below 20Hz) characteristic of Error Amplifier contro l loop results in output voltage runaway
condition. This condition can occur during initial start-up, sudden load r emoval, or during output arcing. The over voltage
comparator monitors the output voltage of the error amplifier. When load is removed, error amp output swings lower than

1.8V, comparator is trigger ed high and output driv er is turned off till the error a mp inverting input voltage drops below 2.5V.
At this point, the error amp output swings positive, turns the output driver back on. The diode, D1,D2 clamp the error amp out­put voltage to two diode drops above referen ce vo ltage. This prohibits the err or amp lifier fr om b eing saturate d, allowing it to
recover faster thus minimizing the boost voltage overshoot.

Multiplier

A single quadrant, two input multiplier is the critical element that enables this device to get power factor correction. One input
of multiplier(Pin 3) is connected to an external resistor divider monitoring the rectified ac line. The other input is internally
driven by a DC voltage which is the difference of err or amplif ier output (Pin 2) and referen ce vo ltage, Vref. The multiplier is
designed to have an extremely linear transfer curve over a wide d ynamic range, 0V to 2V fo r Pin 3, and 2.5V to 3 .5V for the
error amplifier output under all line and load conditions.

The multiplier output controls the current sense comparator threshold as the ac voltage traverses sinusoidally from zero to
peak line. This allows the inductor peak current to follow the ac line thus forcing the average input current to be sinusoidal. In
other words, this has the effect of forcing the MOSFET on-time to track the input line voltage, resulting in a fixed drive output
on-time, thus making the preconverter load appear to be resistive to the ac line.

-

+

-

+

+

1

2

INV

EA OUT

1.8V

Vref

Over Voltage

Vref

To Multiplier

To Drive
Output Sh utdown

Ccomp

D1

D2

Comparator

R1

R2

R3

Band width= 1/(2π×R1×Ccomp)

+

_

Figure 2.1 Error Amp and Over Voltage Comparator

+

KA7525B

11

The equation below describes the relationship between multiplier output and inputs.
Vmo = K × Vm1 × (Vm2-Vref)

K : Multiplier gain
Vm1: Voltage at Pin 3
Vm2: Error amp output voltage
Vmo: Multiplier output voltage

Current Sense Comparator

The current sense comparator RS latch configuration used ensures that only a single pulse appears at the drive output during a
given cycle. MOSFET drain current is converted to voltage using an external sense resistor in series with the external power
MOSFET. When sense voltage exceeds the threshold set by the multiplier output, the current sense comparator terminates the
gate drive to the MOSFET and resets the PWM latch. The latch insures that the output remains in a low state after the MOS­FET drain current falls back to zero.
The peak inductor current under normal operating conditions is controlled by the multiplier output, Vmo.
Abnormal operating conditions occur during preconverter start-up at extremely high line or if output voltage sensing is lost.
Under these conditions, the multiplier output and current sens e threshold will be in ternally clamped to 1 .24V. Therefore, the
maximum peak switch current is limited to:
Ipk(max) = 1.24V / Rsense

Internal R,C filter has been included to attenuate any high frequency noise that may be present on the current waveform. These
circuit block eliminate the need for an external RC filter otherwise required for proper operation of the circuit.

+

-

+

-

+

+

Vref

2

3

1.24V

Current Sense
Comparator

Error Amp

.

Vmo

Vm1

Vm2

INV

MULT

EA OUT

+

­1

Figure 3.1 Multiplier Block

4

CS

LEB Delay(KA7525)

4

cs

1.24V

Multiplier
Output

Rsense

eliminated

Low Pass Filter can be

Figure 4.1 Current Sense Circuit

+

-

RC filter

KA7525B

12

Zero Current Detector

KA7525B operates as a critical conduction current mode controller. The power MOSFET is turned on by the zero current
detector and turned off when the peak inductor c urrent reaches the threshold level established b y the multiplier output. The
slope of the inductor current is indirectly detected by monitoring the voltage across a separate winding and connecting it to the
zero current detector Pin 5.

Once the inductor current reaches ground level, the voltage across the winding reverses polarity. When the Idet input falls
below 1.8V, the comparator output is triggered to the low state.

To prevent false tripping, 240mV of hysteresis is provided. The zero current detector input is internally protected by two
clamps.

The upper 7.5V clamp prevents input over v oltage breakdown while the lower 0.75V clamp prev ents substrate injection. An
internal current limit resistor protects the lower clamp transistor in case the Idet pin is accidently shorted to ground.

A watchdog timer function was added to the IC to eliminate the need for an external oscillator when used in stand-alone
applications. The timer provides a mean s to automatically start or restart the pre converter if the drive outpu t has been o ff for
more than 300us after the inductor current reaches zero.

Drive Output

The KA7525B contains a single totem-pole output stage specifically designed for direct drive of power M OSFET. The drive
output is capable of up to 500mA peak current with a typical rise and fall time of 130ns, 50ns each with a 1.0nF load.
Additional internal circuitry has been added to keep the drive output in a sinking mode whenever the UVLO is active. This
characteristic eliminates the need for an external gate pull-down resistor. Internal voltage clamping ensures that output driver
is always lower than 13V when supply voltage variation exceeds more than rated Vgs threshold (typ 20V) o f the external
MOSFET. This eliminates an external zener diode and extra power dissipation associated with it that otherwise is required for
reliable circuit operation.

KA7525B

13

Application Circuit(#1)

7

-

+

-

+

+

-

+

-

Timer R

Delay

2.5V Ref

Internal

Bias

8

26

1

5

Input

filter

AC
input

PBP204

68uF

390K

IN4004

3.3Ω

0.1uF

IRF830

47uF/450V

LOAD

1M

5.1K

5K

0.5Ω/1W

22K

4

3

-

+

Vcc

2.1V

36V

10V

Zeror Current
Detector

Idet

CS

7.5V

1.24V

Current Sense
Comparator

Vmo

Vm1

0 ~ 2V

GND

EA OUT

Error Amp

Vea(-)

INV

Vref ~ Vref + 1V

Vm2

1.8V

Over Voltage
Protection

OUT

1.8M

MULT

10K

0.01uF

1.8V

Drive
Output

Vcc

UVLO

Vref

Multiplier

Vref

R

Q

S

K =

Vmo

Vm1× (Vm2 - Vref)

Idet

L

+

-

0.1uF

IN4937

33Ω

10Ω

IN4148

+

+

Only KA7525B

(KA7525)

KA7525B

14

Application Circuit(#2)

< 32W×2 Lamps Self-oscillating Ballast>

Component Listing

(For Application #2)

Reference Value Part Number Manufacturer

R1, 2 1.1MΩ-F, 1/4W 26mm Type -

R3 11kΩ-F, 1/4W 26mm Type ­R4 130kΩ , 1/2W 26mm Type ­R5 22kΩ-J, 1/4W 26mm Type -

R6, 13, 15 47kΩ-J, 1/4W 26mm Type -

R7 3.3Ω, 1/4W 26mm Type ­R8 1Ω-J, 1W 26mm Type -

R9 180kΩ-F, 1/4W 26mm Type ­R10 820kΩ-F, 1/4W 26mm Type ­R11 6.8kΩ-F, 1/4W 26mm Type -

D1

D2

D3

D4

C4

R1

R2

R4

V1

L1

C1

C3

C2

Fuse

AC
Input

+

C7

R3

C5

R8

C10

+

C8

C6

64

3

8

1

5

7

2

R7

D6

R5

R6

L2

D5

R11

Q1

R9

R10

C9

Q2

R13

C11

L6

R14

L5

L5

L3

L4

R17

R18

D7

D8

R16

C13

L5

L7

R15

Q3

C12

C14 C15

Lamp
1

Lamp

2

C16

GND

KA7525/B

R12

KA7525B

15

Component Listing

(Continued)

Reference Value Part Number Manufacturer

R12, 17, 18 390kΩ-J, 1/4W 26mm Type -

R14, 16 8.2Ω-J, 1/4W 26mm Type -

C1 0.15uF, 630V MEP-CAP -

C2, 3 2200pF, 3000V Y-CAP -

C4 0.22uF, 630V MPE-CAP -

C5 22uF, 35V Electrolytic -

C6 0.22uF, 25V PPF-CAP -

C7 1000pF, 50V PPF-CAP -

C8 47uF, 450V Electrolytic -

C9 4700pF, 630V PPF-CAP ­C10 2200pF, 630V PPF-CAP -

C11, 12 0.15uF, 630V MPF-CAP -

C13 0.1uF, 50V PPF-CAP -

C14, 15 8200pF, 1000V PP-CAP -

C16 0.15uF, 630V MEP-CAP -

D1, 2, 3, 4, 7 1000V, 1A IN4007GP -

D5 1000V, 1.5A BYV26C -

D6 75V, 150mA IN4148 -

D8 - N413N (DIAC) -

L1 DR 10×12 DIT-010 -
L2 EI 2519 DBT-002 -

L3, 4 EI 2820 DPT-086 -

L5 SB5S 8×3×4 DDT-005 -
L6, 7 10uH BS24-100K ­Fuse - 52NM250V, 3A -

V1 430V INR140, 431 -

KA7525B - KA7525B FairChild

Q1 500V, 4.5A FQPF6N50 FairChild

Q2, 3 400V, 5A KSC5305D FairChild

KA7525B

16

Mechanical Dimensions

Package

Dimensions in millimeters

6.40

±0.20

3.30

±0.30

0.130

±0.012

3.40

±0.20

0.134

±0.008

#1

#4 #5

#8

0.252

±0.008

9.20

±0.20

0.79

2.54

0.100

0.031

()

0.46

±0.10

0.018

±0.004

0.060

±0.004

1.524

±0.10

0.362

±0.008

9.60

0.378

MAX

5.08

0.200

0.33

0.013

7.62

0~15°

0.300

MAX

MIN

0.25

+0.10
–0.05

0.010

+0.004

–0.002

8-DIP

KA7525B

17

Mechanical Dimensions

(Continued)

Package

Dimensions in millimeters

4.92 ±0.20

0.194 ±0.008

0.41 ±0.10

0.016 ±0.004

1.27

0.050

5.72

0.225

1.55 ±0.20

0.061 ±0.008

0.1~0.25

0.004~0.001

6.00 ±0.30

0.236 ±0.012

3.95 ±0.20

0.156 ±0.008

0.50 ±0.20

0.020 ±0.008

5.13

0.202

MAX

#1

#4

#5

0~8°

#8

0.56

0.022

()

1.80

0.071

MAX0.10

MAX0.004

MAX

MIN

+

0.10

-0.05

0.15

+

0.004

-0.002

0.006

8-SOP

KA7525B

11/19/02 0.0m 001

Stock#DSxxxxxxxx

 2002 Fairchild Semiconductor Corporation

LIFE SUPPORT POL I CY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein :

1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.

2. A critical component in any component of a life support
device or sys tem whose failure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec tiveness.

www.fairchildsemi.com

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTION OR DES IGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RI GHTS OF OTHERS.

Ordering Information

Product Number Package Operating Temperature

KA7525B 8-DIP

0 ~ +125°C

KA7525BD 8-SOP