|
|
PDF MAX5934A Data sheet ( Hoja de datos )
| Número de pieza | MAX5934A | |
| Descripción | Positive High-Voltage Hot-Swap Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX5934A (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
19-3282; Rev 1; 7/04
www.DataSheet4U.com
Positive High-Voltage, Hot-Swap Controllers with
Selectable Fault Management and Status Polarity
General Description
The MAX5934/MAX5934A are fully integrated hot-swap
controllers for +9V to +80V (MAX5934A) positive supply
rails. The MAX5934 is optimized for +33V to +80V
power-supply rails. These devices allow for the safe
insertion and removal of circuit cards into a live back-
plane without causing glitches on the backplane
power-supply rail. The MAX5934/MAX5934A feature a
programmable analog foldback current limit, program-
mable undervoltage lockout, and programmable out-
put-voltage slew rate through an external n-channel
MOSFET. In addition, if these devices remain in current
limit for more than a programmable time, the external
n-channel MOSFET latches off.
The MAX5934/MAX5934A feature pin-selectable
PWRGD_ assertion polarity (active low or active high)
and pin-selectable fault management (latched or
autoretry). Other features include automatic restart after
a circuit-breaker fault, selectable duty-cycle (DC)
options, and thermal-shutdown mode for overtempera-
ture protection.
The MAX5934/MAX5934A operate in the extended
(-40°C to +85°C) temperature range and are available
in a 16-pin QSOP package.
Applications
Hot Board Insertion
Electronic Circuit Breakers
Industrial High-Side Switch/Circuit Breakers
Network Routers and Switches
24V/48V Industrial/Alarm Systems
Typical Application Circuit appears at end of data sheet.
Features
♦ Provides Safe Hot Swap for +9V to +80V Power
Supplies (MAX5934A)
♦ Safe Board Insertion and Removal from a Live
Backplane
♦ Pin-Selectable Active-Low or Active-High Power-
Good Output
♦ Pin-Selectable Latched or Autoretry Fault
Management
♦ Programmable Foldback Current Limiting
♦ High-Side Drive for an External N-Channel MOSFET
♦ Built-In Thermal Shutdown
♦ Undervoltage Lockout (UVLO)
♦ Pin-Selectable Duty-Cycle Options (0.94%, 1.88%,
3.75%)
Ordering Information
PART
MAX5934EEE
MAX5934AEEE
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Pin Configuration
TOP VIEW
LATCH/RETRY 1
ON 2
POL_SEL 3
FB1 4
PWRGD2 5
PWRGD1 6
PWRGD3 7
GND 8
MAX5934
MAX5934A
QSOP
16 VCC
15 DC
14 SENSE
13 N.C.
12 FB2
11 GATE
10 TIMER
9 OUT
Selector Guide
PART
MAX5934
MAX5934A
DEFAULT UVLO
(V)
31
8.3
SUPPLY VOLTAGE
RANGE (V)
+33 to +80
+9 to +80
LATCHED/
AUTORETRY FAULT
PROTECTION
Pin-selectable
Pin-selectable
DUTY CYCLE
Pin-selectable
Pin-selectable
PWRGD_
OUTPUT LOGIC
Pin-selectable
Pin-selectable
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Positive High-Voltage, Hot-Swap Controllers with
Selectable Fault Management and Status Polarity
(VCC = +48V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
33
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TA = +85°C
TA = +25°C
TA = -40°C
40 48 56 64 72
VCC (V)
80
SUPPLY CURRENT vs. TEMPERATURE
3.0
2.5
2.0
VCC = 48V
1.5
1.0
VCC = 33V
0.5
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
FB_ LOW-VOLTAGE THRESHOLD
vs. TEMPERATURE
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
-40
-15 10 35 60
TEMPERATURE (°C)
85
1.335
1.330
1.325
1.320
1.315
1.310
1.305
1.300
1.295
1.290
1.285
1.280
-40
FB_ HIGH-VOLTAGE THRESHOLD
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
85
FB_ HYSTERESIS vs. TEMPERATURE
0.11
0.10
0.09
0.08
0.07
0.06
0.05
0.04
-40
-15 10 35 60
TEMPERATURE (°C)
85
-5
-6
-7
-8
-9
-10
-11
-12
-13
-40
IGATE PULLUP CURRENT
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
85
17
16
15
14
13
12
11
10
9
8
7
-40
GATE DRIVE
vs. TEMPERATURE
VCC = +48V
VCC = +33V
-15 10 35 60
TEMPERATURE (°C)
85
GATE DRIVE vs. SUPPLY VOLTAGE
17
16
15
14
13
12
11
10
32 40 48 56 64 72 80
VCC (V)
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Positive High-Voltage, Hot-Swap Controllers with
Selectable Fault Management and Status Polarity
In latch mode, the MAX5934/MAX5934A turn the
MOSFET off and keep it off after an overcurrent fault.
After the fault condition goes away and TIMER falls
below 0.5V, recycle the power supplies or toggle ON
low and high again to unlatch the device.
In autoretry mode, the MAX5934/MAX5934A turn the
MOSFET off after an overcurrent fault occurs. After the
fault condition is removed, the device waits for TIMER to
fall below 0.5V and then automatically restarts. If the fault
is due to an overtemperature condition, the MAX5934/
MAX5934A wait for the die temperature to cool down
below the +130°C threshold before restarting.
Power-Good (PWRGD_ ) Detection
The MAX5934/MAX5934A feature three power-good
outputs (PWRGD_) to indicate the status of three sepa-
rate voltages. PWRGD_ asserts if the device detects an
error condition.
PWRGD_ is true when FB_ voltages exceed the low-to-
high threshold voltage (VFB_H). PWRGD_ is false when
FB_ voltages go lower than the high-to-low threshold
voltage (VFB_L).
Connect external pullup resistors between PWRGD_
and OUT to pull up the PWRGD_ voltages to VOUT.
PWRGD2 can be used to indicate an overvoltage con-
dition on the main power-supply rail.
PWRGD3 asserts when GATE voltage has charged to
4.3V above the supply rail. PWRGD3 deasserts when
the TIMER voltage exceeds 1.233V threshold in response
to an extended fault condition.
The output polarity of PWRGD_ is determined by
POL_SEL. Drive POL_SEL high or leave it floating to
select PWRGD_ active high. Connect POL_SEL to GND
for PWRGD_ active low.
Undervoltage Lockout (UVLO)
The MAX5934A operates from a +9V to +80V supply
voltage range and has a default UVLO set at +8.3V.
The MAX5934 operates from a +33V to +80V supply
voltage range and has a default UVLO set at +31V. The
UVLO thresholds are adjustable using a resistive
divider connected to VCC (see R2 and R3 in Figure 5).
When the input voltage (or VCC) is below the UVLO
threshold, the MOSFET is held off. When the input volt-
age (or VCC) is above the UVLO threshold, the
MAX5934/MAX5934A go into normal operation (or
begin to turn on the external MOSFET).
To adjust the UVLO threshold, connect an external
resistive divider from VIN (or VCC) to ON and then from
ON to GND. The following equation is used to calculate
the new UVLO threshold:
VUVLO_TH = VREF (1 + (R2 / R3))
where VREF is typically 1.233V.
Applications Information
Hot-Circuit Insertion
The supply bypass capacitors on a circuit board can
draw high peak currents from the backplane power bus
as they charge when the circuit boards are inserted
into a live backplane. This can cause permanent dam-
age to the connector pins and glitch the system supply
causing other boards in the system to reset.
The MAX5934/MAX5934A are capable of controlling a
board’s power-supply voltage allowing for the safe
insertion or removal of a board from a live backplane.
These devices provide undervoltage and overcurrent
protection and power-good output signals (PWRGD_).
Overcurrent Protection
The MAX5934/MAX5934A provide sophisticated overcur-
rent protection to ensure robust operation under output-
current-transient and overcurrent fault conditions. The
current-protection circuit employs a foldback current limit
and a short-circuit or excessive output-current protection.
The MAX5934/MAX5934A offer a current foldback fea-
ture where the current folds back as a function of the
output voltage that is sensed at FB1. As Figure 6 illus-
trates, the voltage across RSENSE decreases linearly
when FB1 drops below 0.5V and stops at 12mV when
VFB1 = 0V. The maximum current-limit equation is:
ILIMIT = 47mV / RSENSE
For RSENSE = 0.025Ω, the current limit is set to 1.88A
and goes down to 480mA at short circuit (output short-
ed to GND).
In addition, the MAX5934/MAX5934A feature an
adjustable overcurrent response time. The required
time to regulate the MOSFET current depends on the
input capacitance of the MOSFET, GATE capacitor
(C1), compensation resistor (R1), and the internal delay
from SENSE to GATE. Figure 7 shows the propagation
delay from a voltage step at SENSE until GATE starts to
fall, as a function of overdrive.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX5934A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX5934 | Positive High-Voltage Hot-Swap Controllers | Maxim Integrated Products |
| MAX5934A | Positive High-Voltage Hot-Swap Controllers | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |