SC2434 Просмотр технического описания (PDF) - Semtech Corporation

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SC2434

TriPhase Current Mode Controller with Power Good

Semtech Corporation 

SC2434

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: VCC = +12V, TAMB = 25°C, RDAC = 37.4kΩ, ROSC = 28.5kΩ. See Typical Application Circuit

Parameter

Test Conditions

Min

Typ

Current Sense Amplifier

Amplifier Gain

Input Offset Voltage, Input

Referred

(VOC- - VOC+) < 120mV

(VOC- - VOC+) < 120mV

18.9

19.3

4

CMRR

PSRR

Input Common Mode Range

Max Differential Signal/Current

Limit Threshold

VICM = 9 ~ 14V @ DC

VCC = 9 ~ 14V @ DC

VOC- - VOC+

80

80

VCC ±0.3

120

I-Limit Delay

Current limit activation to OUT1,

60

OUT2 & OUT3 switching off

Vcc UVLO

Ramp-up Threshold

7.5

Ramp-down Threshold

7.25

Outputs (OUT1, OUT2, OUT3)

Max Duty Cycle Per Phase

FOSC = 500kHz, PC pin floating

31

FOSC = 500kHz, PC pin grounded

47

Output Voltage

RL = 10kΩ , high

2.5

RL = 10kΩ , low

0.8

R

L

=

100kΩ

,

high

3.3

RL = 100kΩ , low

0.2

Logic Input

VID Logic Threshold (1) (2)

0.8

VID Logic Impedance

Internal pull-up = 2.5V

25

Phase Control

Logic Threshold (2)

0.8

Internal Pull-up

PC pin open circuit

2.5

Internal Pull-up Impedance

25

Power Good Signal

Off Leakage Current

PWRGOOD = Logic high

Power Good Max Sink Current

PWRGOOD < 0.8V

4

Power Good Threshold

0.8

Notes:

1. If VIDs are left open, no external pull-up is required. When external pull-up is needed, use 3.3V.

2. Max logic input is recommended to be less than 5.5V.

 2005 Semtech Corp.

3

Max

Unit

19.7

V/V

mV

dB

dB

V

mV

ns

V

V

%

%

V

V

2

V

kΩ

2

V

V

kΩ

2

µA

mA

V

www.semtech.com

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