Rainbow-electronics MAX1524 Manual do Utilizador descarregar pdf (Página 12)

MAX1522/MAX1523/MAX1524

Simple SOT23 Boost Controllers

12 ______________________________________________________________________________________

PARAMETER EXAMPLE 1 EXAMPLE 2 EXAMPLE 3

3.3V ±10% 2.7V to 4.2V 1.8V to 3.0V

OUT

5V 12V 5V

OUT(MAX)

700mA 200mA 1.0A

R1, R2

274kΩ, 90.9kΩ 866kΩ, 100kΩ 274kΩ, 90.9kΩ

Duty Cycle (max) 45.5% 78.4% 67.3%

0.5µs (SET = GND) 3µs (SET = V

) 3µs (SET = V

)

SWITCHING

691kHz to 909kHz

when I

OUT

> 120mA

221kHz to 261kHz

when I

OUT

> 35mA

152kHz to 224kHz

when I

OUT

> 167mA

PEAK

1.48A 1.06A 3.51A

IDEAL

3.73µH 33.8µH 6.83µH

ACTUAL

Sumida CR43-3R3

3.3µH, 86mΩ, 1.44A

Sumida CDR74B-330

33µH, 180mΩ, 0.97A

Sumida CDRH125-5R8

5.8µH, 17mΩ, 4.4A

29mW at I

OUT

= 350mA 22mW at I

OUT

= 100mA 22mW at I

OUT

= 500mA

OUT(MIN)

to C

OUT(MAX)

14µF to 448µF 10µF to 53µF 120µF to 640µF

OUT

33µF 33µF 150µF

ESR

COUT(MIN)

23mΩ for stability,

51mΩ for soft-start

74mΩ for stability,

70mΩ for soft-start

21mΩ for stability,

21mΩ for soft-start

OUT(ACTUAL)

Sanyo POSCAP 10TPA33M

33µF, 10V,

60mΩ, 100mΩ max

AVX TPSD336M020R0200

33µF, 20V,

150mΩ, 200mΩ max

Sanyo POSCAP 6TPB150M

150µF, 6.3V,

40mΩ, 55mΩ max

RIPPLE(ESR)

27mVp-p at light loads,

81mVp-p at full load

48mVp-p at light loads,

144mVp-p at full load

42mVp-p at light loads,

126mVp-p at full load

100pF 100pF 100pF

100pF 330pF 220pF

10µF, 6.3V ceramic 10µF, 6.3V ceramic 10µF, 6.3V ceramic

MOSFET Fairchild FDC633N Fairchild FDC633N Vishay Si3446DV

8nC at Vgs = 3V

12nC at Vgs = 5V

9nC at Vgs = 3.6V 10nC at Vgs = 5V

GATE

7.3mA nonbootstrapped,

10.9mA bootstrapped

2.4mA nonbootstrapped 2.2mA bootstrapped

DIODE(RMS)

0.96A 0.49A 1.84A

Diode Nihon EP10QY03, 1A Nihon EP10QY03, 1A Nihon EC21QS03L, 2A

Table 1. Design Examples Using CCM

1 2 ... 7 8 9 10 11 12 13 14

MAX1522/MAX1523/MAX1524 1

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