SG3525ADW datasheet(5/8 Pages) MOTOROLA

Part #	SG3525ADW

Description	PULSE WIDTH MODULATOR CONTROL CIRCUITS

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Manufacturer	MOTOROLA [Motorola, Inc]

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5 / 8 page

SG3525A SG3527A

5

MOTOROLA ANALOG IC DEVICE DATA

Figure 1. Oscillator Charge Time versus RT

Figure 2. Oscillator Discharge Time versus RD

Figure 3. Error Amplifier Open Loop

Frequency Response

Figure 4. Output Saturation

Characteristics (SG3525A)

2.0

5.0 10

20

50

100 200 500 1000 2000 5000 10,000

CHARGE TIME (

µs)

6

57

RD *

CT

RT

* RD = 0 Ω

0.2

0.5

1.0

2.0

5.0

10

20

50

100 200

DISCHARGE TIME (

µs)

1.0

10

100

1.0 k

10 k

100 k

1.0 M

10 M

1

2

9

CP

RZ

f, FREQUENCY (Hz)

–

+

RZ = 20 k

Vref

RT

CT

Sync

Discharge

Gnd

16

6

5

3

7

12

Q2

Q1

Q6

Q9

2.0k

14k

Q10

Q11

5.0pF

400

µA

23k

Q4

Q7

1.0k

Q12

Q13

3.0k

250

4

Blanking

To Output

Ramp

To PWM

Q14

25k

7.4k

Q5

Q8

Q3

OSC Output

1.0k

15

Q3

VCC

9

30

Compensation

1

2

Q4

Q1

Q2

Inverting

Input

5.8V

100

µA

To PWM

Comparator

200

µA

Noninverting

Input

Figure 5. Oscillator Schematic (SG3525A)

0.01

0.02 0.03

0.05 0.07 0.1

0.2

0.3

0.5 0.7 1.0

IO, OUTPUT SOURCE OR SINK CURRENT (A)

Sink Sat, (VOL)

Source Sat, (VC–VOH)

VCC = +20 V

TJ = +25°C

Figure 6. Error Amplifier Schematic (SG3525A)

200

100

50

20

10

5.0

2.0

500

400

300

200

100

0

100

80

60

40

20

0

–20

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

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