Rainbow-electronics MAX726 Manual de usuario descargar pdf (Pagina 4)

MAX724/MAX726

5A/2A Step-Down, PWM,

Switch-Mode DC-DC Regulators

4 _______________________________________________________________________________________

2.25

2.19

-40 100

REFERENCE VOLTAGE

vs. JUNCTION TEMPERATURE

2.20

2.24

JUNCTION TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

2.22

2.21

-25 25 75

2.23

2.18

2.17

125

3.0

SWITCH-ON VOLTAGE

vs. SWITCH CURRENT

0.5

2.5

SWITCH CURRENT (A)

SWITCH-ON VOLTAGE (V)

1.5

1.0

135

2.0

= +25°C

MAX724

MAX726

120

-40 100

SWITCHING FREQUENCY

vs. JUNCTION TEMPERATURE

115

JUNCTION TEMPERATURE (°C)

SWITCHING FREQUENCY (kHz)

105

100

-25 25 75

110

125

8000



ERROR-AMPLIFIER PHASE AND g

3000

7000

FREQUENCY (Hz)

TRANSCONDUCTANCE (µmho)

10M

5000

4000

10k 1M

6000

100k

2000

1000

200

-50

150

PHASE (degrees)

100

-200

-100

-150

PHASE

160

SWITCHING FREQUENCY

vs. FEEDBACK PIN VOLTAGE

140

FB VOLTAGE (V)

SWITCHING FREQUENCY (kHz)

2.0

100

0.5 1.5

120

1.0

2.5 3.0

+125°C

+25°C

-40°C

500

FEEDBACK PIN CURRENT

vs. FB VOLTAGE

400

FB VOLTAGE (V)

FB CURRENT (µA)

200

100

300

-300

-100

-200

-400

-500

78910

START OF FREQUENCY

SHIFTING

-40

OUTPUT CURRENT LIMIT

vs. TEMPERATURE

JUNCTION TEMPERATURE (°C)

OUTPUT CURRENT LIMIT (A)

-25 25

100 125

MAX724

MAX726

____________________________Typical Operating Characteristics (continued)

1 2 3 4 5 6 7 8 9 10 11 12

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Rainbow-electronics MAX726 Manual de usuario Pagina 4

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