Fujitsu MB39A105 manual Triangularwave oscillation

MB39A105

Triangular Wave Oscillation Frequency	Triangular Wave Oscillation Frequency
vs. Timing Resistor	vs. Ambient Temperature

Triangular wave oscillation		10000			Ta = +25 °C	Triangularwave oscillation	600
	frequency fOSC (kHz)											VCC = 3.3 V
					VCC = 3.3 V							RT = 7.5 kΩ
							550
		1000
							500
		100
							450
							(kHz)frequencyOSCf
		10	1	10	100		400−40	−20	0	20	40	60	80	100
				Timing resistor RT (kΩ)				Ambient temperature Ta (°C)

Max On Duty (%)

Max On Duty vs.

Triangular Wave Oscillation Frequency

100
	Ta = +25 °C
95	VCC = 3.3 V

90

85

80

75

70

10 100 1000 10000

Triangular wave oscillation frequency fOSC (kHz)

Error Amplifier Gain and Phase

vs. Frequency

Gain AV (dB)

40

30

20

10

0 −10 −20 −30 −40

ϕ

	Ta =	+25 °C	180
	VCC = 3.3 V
AV
				90	(deg)
			0
					φ
				−90	Phase

−180

10 kΩ

1 ∝F

+

IN 2.4 kΩ

10 kΩ

240 kΩ

10−

11	+	9
	+	OUT
		Error Amp
	1.24 V

100 1 k 10 k 100 k 1 M 10 M

Frequency f (Hz)

(Continued)

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