PT7746-5V [TI]

Current Booster;
PT7746-5V
型号: PT7746-5V
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

Current Booster

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Application Notes  
Mechanical Outline  
For assistance or to order, call (800) 531-5782  
Product Selector Guide  
P T 7 7 4 6 S e r i e s  
32 AMP “CURRENT BOOSTER”  
FOR PT7770 SERIES  
Revised 8/13/98  
The PT7746 is a new high-perfor-  
A PT7746 current booster adds a parallel  
mance 32 Amp “Current Booster” for  
the PT7770 Series housed in a 27-pin  
SIP package.  
output stage driven by the PT7770. As such,  
the system runs in perfect sychronization  
providing a low noise solution.  
Multiple PT7746 boosters will  
operate in parallel with the PT7770  
boosting output current in incre-  
ments of 32A. Combinations of  
PT7770s and PT7746 current  
boosters can easily supply enough  
power for virtually any multiple  
mega-processor application.  
The PT7746 only operates in  
combination with the PT7770 series and is  
not a stand-alone product. Therefore, please  
refer to the PT7771, PT7772, or PT7777  
series data sheet for performance  
specifications. The PT7746 also has the  
same mechanical dimensions and package  
options as the PT7770 series.  
Pin-Out Information  
Ordering Information  
PT7746  
(For dimensions and PC Board layout,  
see Package Styles 1020 and 1030.)  
Pin Function  
Pin Function  
14 GND  
15 GND  
16 GND  
17 GND  
18 GND  
19 GND  
20 Vout  
1
2
3
4
5
6
7
8
9
Do not connect  
Features  
Do not connect  
Do not connect  
Do not connect  
Do not connect  
Do not connect  
Vin  
32A Current Boost  
Automatically Tracks  
Vo of PT7770  
High Efficiency  
Input Voltage Range:  
3V to 5.5V  
PT Series Suffix  
(PT1234X)  
Case/Pin  
Configuration  
Vin  
21 Vout  
Vertical Through-Hole  
N
A
C
Synchronized with PT7770  
27-pin SIP Package  
Run up to 2 in Parallel -  
96 Amps  
Vin  
22 Vout  
Horizontal Through-Hole  
Horizontal Surface Mount  
10 Vin  
23 Vout  
11 Vin  
24 Vout  
12 Do not connect  
13 GND  
25 Vout  
26 Do not connect  
27 Master Sync In  
Standard Application  
PROGRAMMING PINS  
VID0  
VID1  
VID2  
VID3  
VID4  
REMOTE SENSE (+)  
6
4
3
2
1
26  
L1  
VIN  
VOUT  
7 - 11  
20 - 25  
PT7770  
1µH  
27  
13 - 19  
5
12  
+
+
CIN  
COUT  
LOAD  
STBY*  
GND  
GND  
REMOTE SENSE (-)  
When used with PT7771/7772:  
27  
C
= Required 2400µF electrolytic  
= Required 2400µF electrolytic  
= Optional 1µH input choke  
in  
C
out  
L1  
7 - 11  
20 - 25  
L1  
PT7746  
1µH  
When used with PT7777:  
13 - 19  
+
+
C
= Required 2400µF electrolytic  
= Required 680µF electrolytic  
= Optional 1µH input choke  
CIN  
COUT  
in  
C
L1  
out  
Output Capacitors: When used with a PT7771 or PT7772, the PT7746 requires a minimum ouput capacitance of 2400µF. When used with a PT7777,  
the PT7746 requires a minimum ouput capacitance of 680µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output  
capacitance is 30,000µF.  
Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH. The input  
capacitance must be rated for a minimum of 2.6Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required.  
4
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com  
IMPORTANT NOTICE  
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue  
any product or service without notice, and advise customers to obtain the latest version of relevant information  
to verify, before placing orders, that information being relied on is current and complete. All products are sold  
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those  
pertaining to warranty, patent infringement, and limitation of liability.  
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in  
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent  
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily  
performed, except those mandated by government requirements.  
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF  
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL  
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR  
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER  
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO  
BE FULLY AT THE CUSTOMER’S RISK.  
In order to minimize risks associated with the customer’s applications, adequate design and operating  
safeguards must be provided by the customer to minimize inherent or procedural hazards.  
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent  
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other  
intellectual property right of TI covering or relating to any combination, machine, or process in which such  
semiconductor products or services might be or are used. TI’s publication of information regarding any third  
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.  
Copyright 1999, Texas Instruments Incorporated  

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