MAX5934 MAXIM [Maxim Integrated Products], MAX5934 Datasheet - Page 12

• Manufacturer Part Number: MAX5934
• Description: Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity
• Manufacturer: MAXIM [Maxim Integrated Products]

Positive High-Voltage, Hot-Swap Controllers with
Selectable Fault Management and Status Polarity
Figure 7. Response Time to Overcurrent
Figure 8. Overvoltage Detection
12
______________________________________________________________________________________
V
IN
14
12
10
8
6
4
2
0
0
RESPONSE TIME TO OVERCURRENT
50
R3
3.4kΩ
1%
R2
49.9kΩ
1%
100
V
V
CC
CC
C
0.68µF
- V
TIMER
V
V
150
SENSE
CC
CC
D1
30V
1N5256B
(mV)
10
15
1
2
3
200
TIMER
LATCH/RETRY
POL_SEL
DC
ON
V
CC
250
16
0.025Ω
R
SENSE
300
MAX5934A
MAX5934
14
SENSE
GND
8
C1
10nF
1kΩ
5%
R1
PWRGD1
PWRGD2
PWRGD3
An undervoltage fault is detected when V
below the trip point (V
GATE pulls low and stays low until V
(V
An example of overvoltage protection is shown in
Figure 8. Zener diode D1 turns on when V
the diode’s breakdown voltage and begins to pull
TIMER high. When V
fault is detected and GATE pulls low. As a result, Q1
turns off. Figure 9 shows overvoltage waveforms for V
(see the Fault Management ( LATCH /RETRY) section for
restart conditions).
The MAX5934/MAX5934A are guaranteed to be safe
from damage with supply voltages of up to 85V. Spikes
at voltages above 85V may damage the part.
Instantaneous short-circuit conditions, can cause large
11
GATE
OUT
FB1
FB2
ONH
Undervoltage and Overvoltage Detection
R
10Ω
5%
G
4
6
5
7
12
9
= 1.313V).
M1
3.57kΩ
59kΩ
IRF530
1%
1%
R4
R5
V
24kΩ
MONITOR
5%
Supply Transient Protection
R6
PWRGD
TIMER
R10
1kΩ
1%
ONL
R9
90kΩ
1%
24kΩ
5%
= 1.233V). When this occurs,
R7
goes higher than 1.233V, a
24kΩ
5%
R8
ON
C
rises above
L
IN
ON
exceeds
goes
IN