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Part: ISL6744AB
Category:
Power Management
-> PWM Controllers
Description: Intermediate Bus PWM Controller With Precision Dead-time Adjustment<<<>>>the ISL6744 is a Low Cost, Primary Side, Double-ended Controller Intended For Applications Using Full And Half-bridge Topologies For Unregulated DC-DC Converters. Typical Applications Are Bus Converters And DC Transformers. It Provides Adjustable Oscillator Frequency, Adjustable Soft-start, Overcurrent Shutdown, And Precise Control of Switching Frequency And Deadtime.<<<>>><<<>>>this Advanced Bicmos Design Features Low Start-up And Operating Currents, Adjustable Switching Frequency up to 1MHz, 1A Fet Drivers, And Very Low Propagation Delays.<<<>>> <<<>>> <<<>>>Key Features <<<>>> <<<>>> <<<>>>Precision Duty Cycle And Deadtime Control <<<>>>100µA Startup Current <<<>>>Adjustable Delayed Overcurrent Shutdown And Re-start <<<>>>Adjustable Oscillator Frequency up to 2MHz <<<>>>1A MOSFET Gate Drivers <<<>>>Adjustable Soft-start <<<>>>Internal Over Temperature Protection <<<>>>35ns Control to Output Propagation Delay <<<>>>Small Size And Minimal External Component Count <<<>>>Input Under Voltage Protection
Company: Intersil Corporation
Datasheet: Download ISL6744AB datasheet File size : 330 kB
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Datasheet text preview:
®
ISL6744
D a ta Sheet Ju n e 2004 FN9147.2
Intermediate Bus PWM Controller
The ISL6744 is a low cost, primary side, double-ended controller intended for applications using full and half-bridge topologies for unregulated DC-DC converters. Typical applications are bus converters and DC transformers. It provides adjustable oscillator frequency, adjustable soft-start, overcurrent shutdown, and precise control of switching frequency and deadtime. This advanced BiCMOS design features low start-up and operating currents, adjustable switching frequency up to 1MHz, 1A FET drivers, and very low propagation delays.
Features
· Precision Duty Cycle and Deadtime Control · 100µA Startup Current · Adjustable Delayed Overcurrent Shutdown and Re-Start · Adjustable Oscillator Frequency Up to 2MHz · 1A MOSFET Gate Drivers · Adjustable Soft-Start · Internal Over Temperature Protection · 35ns Control to Output Propagation Delay · Small Size and Minimal External Component Count
Ordering Information
PART NUMBER ISL6744AU ISL6744AB TEMP. RANGE (°C) -40 to 105 -40 to 105 PACKAGE 8 Ld MSOP 8 Ld SOIC PKG. DWG. # M8.118 M8.15
· Input Under Voltage Protection
Applications
· Telecom and Datacom Isolated Power · DC Transformers · Bus Converters
Add -T suffix to part number for tape and reel packaging
Pinout
ISL6744 (SOIC, MSOP) TOP VIEW
SS 1 RTD 2 CS 3 CT 4 8 VDD 7 OUTB 6 OUTA 5 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
Internal Architecture
VDD VBIAS 5.00 V VBIAS
FL
VDD
Q
OUTA
+ BG
UVLO
T Q
OUTB VBIAS 70uA
PWM TOGGLE
INTERNAL OT SHUTDOWN 130 - 150 C
GND
I DCH= 55 x IRTD
2
VBIAS SS CLAMP RTD 2.0 V IRTD + 4.0 V VBIAS 160 uA ON 2.8 V + CT 0.8 V + VALLEY PEAK
S R Q Q S R Q Q
ON
SS
+ + SS CHARGED 3.9 V
15 uA
OC LATCH CLK
ISL6744
Q Q
RESET DOMINANT
50 µS RETRIGGERABLE ONE SHOT
SS LOW
+ SS
0.27 V
FAULT LATCH SET DOMINANT
S Q Q S R Q Q
FL
IDCH
R
ON
PWM LATCH SET DOMINANT VBIAS UV 4.65V 4.80V OC DETECT + BG
VBIAS
CS 0.6 V
+ -
SS COMPARATOR CT + -
SS 0.8
Typical Application using ISL6744 - 48V Input DC Transformer, 12V @ 8A Output
SP1 V IN + QR1 L1 C2 QH L3 T1 R8 C13 C9 C8 R TN C 11 QR3 +1 2
TP1
R10
L2
3
V IN -
C1 T2 R9
R2 CR3
QL C14 R 11
QR2
QR4
C 12
C3 R1 C7 U1 IS L 6 7 0 0 V DD HB CR4 HO HS LO V SS LI HI TP4 CR1 R5
CR2 TP2 R6
ISL6744
C 10
C4 C5 TP5 U2 SS
GND
ISL6744
O U TB OU TA V DD R7 D2 TP6 Q5 C15
CS CT R TD C 18
C17 D1 R 12 C6
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