ISL6140 Просмотр технического описания (PDF) - Renesas Electronics
Номер в каталоге
Компоненты Описание
производитель
ISL6140 Datasheet PDF : 20 Pages
| |||
ISL6140, ISL6150
ISL6140/ISL6150 Block Diagram
GND
R4
3 UV
-
VUVL, VOVH
(1.223V)
+
R5
+-
VEE
-
2 OV
+
8 VDD
VCC (INTERNAL
VOLTAGE) AND
REFERENCE
GENERATOR
VEE
VCC
VPG (1.7V)
VUVL, VOVH
VCB (50mV)
PWRGD/PWRGD
OUTPUT DRIVE
LOGIC AND
GATE DRIVE
GND
1 PWRGD (6150)
1 PWRGD (6140)
R6
-48V IN
+-VCB (50mV)
VEE
-
+
4 VEE
5 SENSE
R1
6 GATE
R3 C2
R2
C1
VPG (1.7V)
+-
VEE
7 DRAIN
Q1
LOAD
CL
RL
-48VOUT
Typical Values for a representative
system; which assumes:
36V to 72V supply range; 48 nominal; UV = 37V;
OV = 71V
1A of typical current draw; 2.5A overcurrent
100µF of load capacitance (CL); equivalent RL of 48
(R = V/I = 48V/1A)
R1: 0.02 (1%)
R2: 10 (5%)
R3: 18k (5%)
R4: 562k (1%)
R5: 9.09k (1%)
R6: 10k (1%)
C1: 150nF (25V)
C2: 3.3nF (100V)
Q1: IRF530 (100V, 17A, 0.11)
FN9039 Rev 5.00
December 3, 2015
Applications: Quick Guide to
Choosing Component Values
(See Block Diagram for reference)
This section will describe the minimum components
needed for a typical application, and will show how to
select component values. (Note that “typical” values
may only be good for this application; the user may
have to select some component values to match the
system). Each block will then have more detailed
explanation of how it works, and alternatives.
R4, R5, R6 - together set the Under-Voltage (UV) and
overvoltage (OV) trip points. When the power supply
ramps up and down, these trip points (and their 20mV
nominal hysteresis) will determine when the gate is
allowed to turn on and off (the UV and OV do not affect
the PWRGD output). The input power supply is divided
down such that when each pin is equal to the trip point
(nominal is 1.223V), the comparator will switch.
VUV = 1.223 (R4 + R5 + R6)/(R5 + R6)
VOV = 1.223 (R4 + R5 + R6)/(R6)
The values of R4 = 562k, R5 = 9.09k, and R6 = 10k
will give trip points of UV = 37V and OV = 71V.
Q1 - is the FET that connects the input supply voltage
to the output load, when properly enabled. It needs to
Page 7 of 20
Share Link: 