MC34701 查看數據表（PDF） - Freescale Semiconductor

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MC34701

1.5A Switch-Mode Power Supply with Linear Regulator

Freescale Semiconductor 

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 4. DYNAMIC ELECTRICAL CHARACTERISTICS

Characteristics noted under conditions -40°C ≤ TA ≤ 85°C unless otherwise noted. Input voltages VIN1 = VIN2 = 3.3V using

the typical application circuit (see Figures 33), unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

BUCK CONVERTER

Duty Cycle Range (Normal Operation)(18)

Switching Node SW Rise Time(18)

VIN = 5.0V, ILOAD = 1.0A

tD

tRISE

0.0

–

95

%

ns

–

7.0

–

Switching Node SW Fall Time(18)

VIN = 5.0V, ILOAD = 1.0A

tFALL

ns

–

17

–

Maximum Deadtime(18)

tD

Buck Control Loop Propagation Delay(18)

tPD

VINV < 0.8V to VSW > 90% of High Level or VINV > 0.8V to VSW < 10%

of Low Level

–

35

–

ns

ns

–

50

–

Soft Start Duration (Power Sequencing Disabled, EN1 = 1, EN2 = 1)(18)

tSS

200

350

800

µs

Fault Condition Timeout(18)

tFAULT

7.0

10

15

ms

Retry Timer Cycle(18)

tRET

70

100

150

ms

OSCILLATOR

Oscillator Center Frequency(20)

RF = 11.3kΩ

fOSC

270

300

330

kHz

Oscillator Frequency Range

Oscillator Frequency Adjusting Resistor Range

Oscillator Frequency Adjustment(19), (20)

RF = 7.0kΩ

Oscillator Frequency Adjustment(19), (20)

RF = 22kΩ

fOSC

200

–

400

kHz

RFREQ

7.0

–

22

kΩ

fOSC

400

–

kHz

–

fOSC

kHz

–

–

200

Oscillator Default Frequency (Switching Frequency), FREQ Pin Open

Oscillator Output Signal Duty Cycle (Square Wave, 180° Out-of-Phase with

the Internal Suitable Oscillator)

Synchronization Pulse Minimum Duration(18)

Notes

18. Design information only. This parameter is not production tested.

19. see Figure 4 for more details

20. RF is RFREQ

fOSC

DOSC

tSYNC

–

300

40

50

1.0

–

–

kHz

%

60

–

µs

34701

12

Analog Integrated Circuit Device Data

Freescale Semiconductor

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