Fujitsu MB39A104 manual Power Dissipation vs. Ambient Temperature

Page 10

MB39A104

(Continued)

Error Amplifier, Gain, Phase vs. Frequency

40

Ta = +25 °C

180

VCC = 12 V

240 kΩ

30

AV

ϕ

20

90

(deg)

10 kΩ

(dB)

10

+

(15)

1 ∝F

GainAV

0

0

Phaseφ

2.4 kΩ

10

−

IN

+

9

−10

11

10 kΩ

+

(16)

OUT

(14)

−20

−90

Error Amp1

−30

1.24 V

(Error Amp2)

−40

−180

100

1 k

10 k

100 k

1 M

10 M

Frequency f (Hz)

Power Dissipation vs. Ambient Temperature

	1000
(mW)	800
(mW)	740
PD	740
PD
dissipation	600
	400

Power	200
Power
	0
	−40	−20	0	20	40	60	80	100

Ambient temperature Ta ( °C)

10

Image 10

Contents Description FeaturesPackage MB39A104 PIN AssignmentsPin No Symbol Descriptions PIN DescriptionBlock Diagram Absolute Maximum Ratings Parameter Symbol Condition Rating Unit Min MaxParameter Symbol Condition Value Unit Min Typ Recommended Operating ConditionsPin No Conditions Electrical CharacteristicsParameter Min Typ MaxParameter Symbol Pin No Conditions Value Unit MinTypical Characteristics Reference Voltage vs. Ambient TemperatureTriangular Wave Oscillation Frequency Power Dissipation vs. Ambient Temperature Functions Protection circuit operating function table Timer-latch overcurrent protection circuit block OCPUnder voltage lockout protection circuit Uvlo Operating circuitSetting the Output Voltage Setting the Triangular Oscillation FrequencySetting the SOFT-START and Discharge Times MB39A104 Treatment Without Using CS Terminal Without Setting Soft-Start TimeAbout TIMER-LATCH Protection Circuit Overcurrent detection circuitOvercurrent Protection Circuit Range of Operation Method to detect by mean currentTimer-latch short-circuit protection circuit Treatment Without Using Cscp Terminal Resetting the Latch of Each Protection CircuitEquivalent Circuit On Power on OFF Standby mode Parts List Component Specification VendorSelection of Components CH1CH2 = 3 2 ⋅ 0.05 ⋅ 0.174 = 0.078 W Example Peak-to-peak value ΔIL Di ≥ I O ⋅ 1 − ESR ≤ ΠfC L 050 491 ESR ≤ ΠfC L 033 364 Reference Data Total Efficiency vs. Input VoltageSwitching Wave Form CH1 Do not apply negative voltages Usage PrecautionOrdering Information Part number Package RemarksPackage Dimensions IndexFujitsu Limited