ISL78307 Datasheet, PDF (13/20 Pages) Intersil Corporation – Intersil’s Solutions for Industrial Process Control

INTERSIL SELECTION GUIDE | INDUSTRIAL PROCESS CONTROL SOLUTIONS
PLC
Analog Input
Analog Output
HV Dual Supply Power Solution
Control
Sensors
Power
5V
C₀
5µF
VDDOUT
VDD
NEN
NSYNC
GND
L₁
6.8µH
LX
D₁
VOUT
Q₁
FB
ISL97701
C₂
+
-
D₂
4.7µF
D₃
C₃ ^-
+ ^4.7µF
V₀
C₁ ⁺
4.7µF
-
20.99V
R₁
383kΩ
R₂
22.2kΩ
ISL28108
5V
V+
+
R₃
-
V-
33.2kΩ
R₄
100kΩ
For more information, refer to AN1673 “Application Circuit to generate
Positive and Negative Supplies Using ISL97701 Boost Regulator”.
- 20.99V
VOUT_(positive)
20V
R₆
100kΩ
R₅
-
V-
+ ^100kΩ
V+
5V
ISL28108
VOUT_(negative)
-20V
Integrated FET Boost Regulator: ISL97701
Boost Regulator
for Positive and
Negative Supplies
Up to 2.5W Output Power Delivered in a 3x3mm TDFN Package
3.2
2.9
2.6
2.3
2.0
1.7
1.4
1.1
0.8
0.5
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V_IN (V)
RECOMMENDED MAXIMUM OUTPUT POWER vs INPUT VOLTAGE
Highly Integrated Design Reduces External Components
Key Features
• Up to 87% Efficiency
• 2.3V to 5.5V Input
• Up to 28V Output
• Integrated Boost Schottky Diode
• Input Voltage Disconnect Switch for Micro Power
Shutdown
• Synchronization Input
Integrated input
disconnect switch
enables true micro
power shutdown.
2.3V TO 5.5V
VDDOUT
VDD
C₀
5µF
NEN
NSYNC
GND
L₁
6.8µH
LX
VOUT
FB
• 10 Ld 3x3 DFN Package
• Pb-free (RoHS Compliant)
• Up to 2.5W Output Power
Synchronization input
ISL97701
to lock to preferred
switching frequency to
reduce unwanted noise NOTE: VOUT = (390k + 39k)/39k*1.15V = 12.65V
in the system.
Integrated
Schottky diode
V_DD+2V TO 30V
C₁
3.3µF
R₁
390kΩ
Internally
compensated boost
requires only a small
3.3µF output cap for
stability.
R₂
39kΩ
www.intersil.com/industrial_process_control | 13