LT1641CS8 Ver la hoja de datos (PDF) - Linear Technology

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LT1641CS8

Positive High Voltage Hot Swap Controller

Linear Technology 

LT1641

APPLICATIO S I FOR ATIO

Power Good Detection

The LT1641 includes a comparator for monitoring the

output voltage. The noninverting input (FB pin) is com-

pared against an internal 1.233V precision reference and

exhibits 80mV hysteresis. The comparator’s output

(PWRGD pin) is an open collector capable of operating

from a pull-up as high as 100V.

The PWRGD pin can be used to directly enable/disable a

power module with an active high enable input. Figure 14

shows how to use the PWRGD pin to control an active low

enable input power module. Signal inversion is accom-

plished by transistor Q2 and R7.

Supply Transient Protection

The LT1641 is 100% tested and guaranteed to be safe

from damage with supply voltages up to 100V. However,

spikes above 100V may damage the part. During a short-

circuit condition, the large change in currents flowing

through the power supply traces can cause inductive

voltage spikes which could exceed 100V. To minimize the

spikes, the power trace parasitic inductance should be

minimized by using wider traces or heavier trace plating

and a 0.1µF bypass capacitor placed between VCC and

GND. A surge suppressor at the input can also prevent

damage from voltage surges.

VIN

48V

R1

294k

1%

UV = 37V

R2

10.2k

1%

GND

RS

0.01Ω

Q1

IRF530

D1

R5

10Ω

CMPZ

5248B

R3

143k

5%

1%

C1

R6, 10nF

1k, 5%

+

8

VCC

1

ON

7

SENSE

6

GATE

LT1641

2

FB

R7

47k

5%

R4

4.22k

1%

TIMER

5

C2

0.68µF

GND

4

3

PWRGD

Q2

MMBT5551LT1

CL

220µF

ACTIVE LOW

ENABLE MODULE

VIN+ VOUT+

ON/OFF

VIN– VOUT–

VOUT

1641 F14

Figure 14. Active Low Enable Module

10

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