IMP38HC45 IMP, IMP38HC45 Datasheet

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IMP38HC45

Manufacturer Part Number
IMP38HC45
Description
(IMP38HC42 - IMP38HC45) BiCMOS Current-Mode PWM Controllers
Manufacturer
IMP
Datasheet

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Part Number:
IMP38HC45ESA/T
Manufacturer:
IMP
Quantity:
20 000
www.DataSheet.co.kr
The IMP38C4x and IMP38HC4x are fixed frequency, high performance,
current-mode PWM controllers that are pin compatible with bipolar 384x
devices but feature improvements resulting from IMP’s BiCMOS
processing and circuit design. Notable among the improvements are zero
cross-conduction/shoot-through current, reduced start-up and operating
current, lower current-sense delay, higher frequency operation, full
supply voltage swing at the output and a 1% trimmed voltage reference.
IMP38C4x and IMP38HC4x output driver stage has zero cross-conduction
current. A proprietary output state-machine monitors each output
MOSFET and guarantees by design zero cross-conduction current. This is
an industry first for 384x PWM devices.
Under-voltage lockout (UVL) performance has been improved. When
the power supply voltage is below the startup voltage, internal circuitry
puts the output into a low impedance state. The output will sink 20mA
and remain below 1.3V, well below the turn-on threshold voltage of the
external MOSFET. Even when V
not rise above approximately 1.3V because the output UVLO circuit is
© 2000 IMP, Inc.
Block Diagrams
COMP
RTCT
V
V
REF
FB
DD
7 (12)
8 (14)
4 (7)
1 (1)
2 (3)
(
+
) Pins Are 14-Pin Devices Only
2.5V
Ref
+
EA
Reference
Oscillator
DD
5V
drops to zero volts, the out pin will
2R
AGND (9)
GND 5
IMP38C/HC/42/3/4/5
IMP38C/HC/42/3/4/5
R
+
1V
ISNS
3 (5)
408-432-9100/www.impweb.com
+
+
COMP
UVLO
T
S
R
Connection Notes
IMP38C4X, IMP38HC4X (8-Pin Devices)
50% Maximum Duty Cycle:
IMP38C44, IMP38HC44, IMP38C45, IMP38HC45
96% Maximum Duty Cycle:
IMP38C42, IMP38HC42, IMP38C43, IMP38HC43
Q
Q
N 384x Series Pinout with BiCMOS Technology
N Zero Cross-Conduction Current by Design
N 1MHz Operation
N 65ns Maximum Current-Sense Delay
N 120µA Maximum Start-Up Current
N 1.5mA Maximum Operating Current
N High Output Current Drive
N 20V Maximum Supply Voltage
N 2.5V, 1%, Trimmed Error Amplifier Reference
N Trimmed Oscillator Discharge Current
N Pin-for-Pin Enhanced Replacements for Micrel
– 1.0A, IMP38HC4x
– 0.5A, IMP38C4x
MIC38C/HC4x and GMT38C4x/HC4x
Key Features
6 (10)
(11)
(8)
38C/HC_01.eps
V
OUT
PGND
D
1
Datasheet pdf - http://www.DataSheet4U.net/

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IMP38HC45 Summary of contents

Page 1

... R 3 (5) Connection Notes IMP38C4X, IMP38HC4X (8-Pin Devices) 50% Maximum Duty Cycle: GND 5 ISNS IMP38C44, IMP38HC44, IMP38C45, IMP38HC45 AGND (9) 96% Maximum Duty Cycle: IMP38C42, IMP38HC42, IMP38C43, IMP38HC43 408-432-9100/www.impweb.com Key Features N 384x Series Pinout with BiCMOS Technology N Zero Cross-Conduction Current by Design N 1MHz Operation N 65ns Maximum Current-Sense Delay N 120µ ...

Page 2

... Current-sense propagation delay time is 35ns typical, 65ns maxi- mum, representing percent reduction over other 38xx implementations. Output stage drive is 0.5A for IMP38C4x devices. The high-drive IMP38HC4x family is rated at 1.0A peak current drive. Like conventional 384x controllers, the IMP38C4x and IMP38HC4x controllers use the current-mode architecture for superior load regulation, pulse-by-pulse current limiting and out- put MOSFET protection ...

Page 3

... For SO and MicroSO packages, append “/T” to the ordering part number for tape and reel packaging. © 2000 IMP, Inc. – ° ° – ° ...

Page 4

... MicroSO (θ 8-Pin SO (θ 14-Pin Plastic DIP (θ 14-Pin SO (θ Note: All voltages are referenced to GND. These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability +25° 1mA ...

Page 5

... CC IMP38C42/3 and IMP38HC42/3 devices. Output frequency equals one-half the oscillator frequency for IMP38C44/5 and IMP38HC44/5 devices PWM Controllers 3.10 V/V 1 µ ...

Page 6

... Under-voltage lockout (UVL) performance has been improved. When the power supply voltage is below the startup voltage, internal circuitry puts the output into a low impedance state and sets the output to zero. The output will sink up to 20mA in this controlled state and remain below 1.3V, well below the turn-on threshold voltage of the external MOSFET ...

Page 7

... COMP + Connection Notes 3 (5) IMP38C4X, IMP38HC4X (8-Pin Devices) 50% Maximum Duty Cycle: ISNS IMP38C44, IMP38HC44, IMP38C45, IMP38HC45 96% Maximum Duty Cycle: IMP38C42, IMP38HC42, IMP38C43, IMP38HC43 ( ) Pins Are 14-Pin Devices Only Figure 3. UVL Protection Circuit ...

Page 8

... © 2000 IMP, Inc. Datasheet pdf - http://www.DataSheet4U.net/ ...

Page 9

... © 2000 IMP, Inc 0°– 8° (16-Pin).eps 0°–15° Plastic DIP (14-Pin).eps ...

Page 10

... N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Fax: 408-434-0335 e-mail: info@impinc.com http://www.impweb.com The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners. © 2000 IMP, Inc. Printed in USA Publication #: 3001 Revision: ...

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