ISL6140 Intersil Corporation, ISL6140 Datasheet - Page 6

• Manufacturer Part Number: ISL6140
• Description: Negative Voltage Hot Plug Controller
• Manufacturer: Intersil Corporation

ISL6140/ISL6150 Block Diagram
Typical Values for a representative system; which
assumes:
36V to 72V supply range; 48 nominal; UV = 37V; OV = 71V
1A of typical current draw; 2.5 Amp Over-Current
100µF of load capacitance (CL); equivalent RL of 48Ω
(R = V/I = 48V/1A)
R1: 0.02Ω (1%)
R2: 10Ω (5%)
R3: 18kΩ (5%)
R4: 562kΩ (1%)
R5: 9.09kΩ (1%)
R6: 10kΩ (1%)
C1: 150nF (25V)
C2: 3.3nF (100V)
Q1: IRF530 (100V, 17A, 0.11Ω)
-48V IN
GND
R4
R5
R6
3 UV
2 OV
V
(1.223V)
UVL
4 V
+
-
V
EE
, V
EE
OVH
6
+
-
V
V
R1
EE
CB
+
+
-
-
(50mV)
5 SENSE
+
-
ISL6140, ISL6150
VOLTAGE) AND
V
CC
GENERATOR
REFERENCE
(INTERNAL
C1
V
EE
8 V
LOGIC AND
GATE DRIVE
DD
R2
Q1
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 Over-
Voltage (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.
V
V
The values of R4 = 562K, R5 = 9.09K, and R6 = 10K will
give trip points of UV = 37V and OV = 71V.
V
V
V
V
UV
OV
6 GATE
CC
PG
UVL
CB
R3
= 1.223 (R4 + R5 + R6)/(R5 + R6)
(1.7V)
(50mV)
= 1.223 (R4 + R5 + R6)/(R6)
, V
C2
OVH
PWRGD/PWRGD
OUTPUT DRIVE
7 DRAIN
+
-
V
V
EE
PG
(1.7V)
1 PWRGD (6150)
1 PWRGD (6140)
CL
-48V OUT
GND
RL
LOAD