PT7722N [TI]
High Efficiency;
| 型号： | PT7722N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | High Efficiency 开关 |
| 文件： | 总4页 (文件大小：201K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
For assistance or to order, call (800) 531-5782
Revised 1/13/99
P T 7 7 2 0 S e r i e s
Application Notes
Mechanical Outline
Product Selector Guide
17 AMP 12V INPUT “BIG-HAMMER II” PRO-
GRAMMABLE ISR
The PT7720 series is a new +12V input,
17A output, high-performance Integrated
Switching Regulator (ISR) housed in a 27-
pin SIP package. The 17A capability allows
easy integration of the latest high-speed,
low-voltage µPs and bus drivers into +12V
distributed power systems.
The PT7720 series has been designed
to work in parallel with one or more of the
PT7748 current boosters for increased Iout
in increments of 17A.
The output voltage of the PT7721 can
be easily programmed from 1.3V to 3.5V
with a 5 bit input compatible with Intel’s
Pentium IIProcessor. A differential re-
mote sense is also provided which
automatically compensates for any voltage
drop from the ISR to the load.
1200µF of output capacitance is re-
quired for proper operation.
Pin-Out Information
Features
Pin Function
Pin Function
• +12V bus input
• 5-bit Programmable:
1.3V to 3.5V or
1
2
3
4
5
6
7
8
VID0
VID1
VID2
VID3
STBY* - Stand-by
VID4
Vin
15 GND
16 GND
17 GND
Standard Application
PROGRAMMING PINS
4.5V to 7.6V
VID0
VID1
VID2
VID3
18 GND
19 GND
20 Vout
21 Vout
22 Vout
23 Vout
24 Vout
25 Vout
REMOTE SENSE (+)
• High Efficiency
• Differential Remote Sense
• 27-pin SIP Package
• Parallelable with PT7748
17A current boosters
VID4
6
4
3
2
1
26
L1
VIN
VOUT
7
-
11
20 - 25
PT7720
1µH
Vin
27
13
-
19
5
12
+
+
CIN
COUT
LOAD
9
10
11
12
13
14
Vin
Vin
Vin
SYNC OUT
GND
GND
STBY*
REMOTE SENSE (-)
Remote Sense Gnd
GND
GND
26
Remote Sense Vout
C
= Required 560µF electrolytic
(See input filter note)
in
27 Sync Out
For STBY* pin:
open = output enabled
ground = output disabled.
C
= Required 1200µF electrolytic
out
L1 = Optional 1µH input choke
Specifications
PT7720 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Ta = +60°C, 200 LFM, pkg N, Vo ≤ 5V
Ta = +25°C, natural convection, Vo ≤ 5V
0.1*
0.1*
—
—
17**
17**
A
A
Output Power
Po
Ta = +60°C, 200 LFM, pkg N, Vo ≥ 5V
Ta = +25°C, natural convection, Vo ≥ 5V
—
—
—
—
85
85
Watts
Watts
Input Voltage Range
Vin
0.1A ≤ Io ≤ 17A
11.0
—
14.0
V
Output Voltage Tolerance
∆Vo
Vin = +12V, Io = 17A
(PT7721)
(PT7722)
Vo-0.03
—
—
Vo+0.03
±2.0%
V
0°C ≤ Ta ≤ +60°C
±1.0%
% Vo
Line Regulation
Load Regulation
Vo Ripple/Noise
Regline
Regload
Vn
11V ≤ Vin ≤ 14V, Io = 17A (Using remote sense)
Vin = +12V, 0.1 ≤ Io ≤ 17A (Using remote sense)
—
—
±5
±5
±10
±10
mV
mV
Vin = +12V, Io = 17A
(PT7721)
(PT7722)
—
—
50
—
—
mVpp
mVpp
100
Transient Response
with Cout = 1200µF
ttr
Io step between 7.5A and 15A
Vo over/undershoot
—
—
100
200
—
—
µSec
mV
Vos
Efficiency
η
Vin = +12V, Io = 10A
Vo = 5.0V
Vo = 3.3V
Vo = 2.5V
Vo = 1.5V
—
—
—
—
90
88
85
78
—
—
—
—
%
%
%
%
Switching Frequency
ƒo
11V ≤ Vin ≤ 14V
0.1A ≤ Io ≤ 17A
300
0
350
—
400
+85
kHz
°C
Absolute Maximum
Operating Temperature Range
Ta
—
Recommended Operating
Temperature Range
Ta
Ts
Forced Air Flow = 200 LFM
0
—
+65***
+125
—
°C
°C
G’s
At Vin
—
Io = 12A
= 12V,
Storage Temperature
Mechanical Shock
-40
—
—
Per Mil-STD-883D, Method 2002.3 , 1 msec,
Half Sine, mounted to a fixture
TBD
Mechanical Vibration
Weight
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
Vertical/Horizontal
—
—
TBD
—
—
G’s
—
51/64
grams
*
ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.
** The PT7720 series can be easily paralleled with one or more of the PT7748 Current Boosters to provide increased output current in increments of 17A.
*** See Safe Operating Area chart.
Output Capacitors: The PT7720 series requires a minimum output capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance
Is (57,000 ÷ Vout)µF, or 15,000µF, whichever is less.
Input Filter: An input inductor is optional for most applications. The input inductor must be sized to handle 7ADC with a typical value of 1µH. The input capacitance must be rated for a
minimum of 4.0 Arms of ripple current when operated at maximum output current and maximum output voltage. Contact an applications engineer for input capacitor selection for applications
at other output voltages and output currents.
50
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
For assistance or to order, call (800) 531-5782
P T 7 7 2 0 S e r i e s
Programming Information
Ordering Information
PT7721
PT7722
PT7721❏ = 1.3 to 3.5 Volts
PT7722❏ = 4.5 to 7.6 Volts
VID4=1 VID4=0 VID4=1 VID4=0
VID3 VID2 VID1 VID0
Vout
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
3.2V
3.3V
3.4V
3.5V
Vout
1.30V
1.35V
1.40V
1.45V
1.50V
1.55V
1.60V
1.65V
1.70V
1.75V
1.80V
1.85V
1.90V
1.95V
2.00V
2.05V
Vout
4.5V
4.6V
4.7V
4.8V
4.9V
5.0V
5.1V
5.2V
5.3V
5.4V
5.5V
5.6V
5.7V
5.8V
5.9V
6.0V
Vout
6.1V
6.2V
6.3V
6.4V
6.5V
6.6V
6.7V
6.8V
6.9V
7.0V
7.1V
7.2V
7.3V
7.4V
7.5V
7.6V
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
(For dimensions and PC board layout,
see Package Styles 1000 and 1010.)
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
Horizontal Through-Hole
Horizontal Surface Mount
N
A
C
Logic 0 = Pin 12 potential (remote sense gnd)
Logic 1 = Open circuit (no pull-up resistors)
VID3 and VID4 may not be changed while the unit is operating.
C H A R A C T E R I S T I C
D A T A
Efficiency vs Output Current (@Vin=+12V)
Safe Operating Area (@Vin=+12V, Vout=+3.3V, Pkg N)
90
80
70
60
50
40
30
20
100
90
80
70
60
50
40
Vout
5.0V
Airflow
Recommended Maximum
200LFM
Operating Temperature
3.3V
2.5V
1.5V
120LFM
60LFM
Nat conv
0
2
4
6
8
10
12
14
16
18
20
0
2
4
6
8
10 12 14 16 18 20
Output Current (A)
Output Current (A)
Output Ripple vs Output Current (@Vin=+12V)
Safe Operating Area (@Vin=+12V, Vout=+5.0V, Pkg N)
90
80
70
60
50
40
30
20
16
14
12
10
8
Vout
Recommended Maximum
Operating Temperature
Airflow
5.0V
3.3V
2.5V
1.5V
200LFM
120LFM
60LFM
Nat conv
6
4
2
0
0
2
4
6
8
10
12
14
16
18
20
0
2
4
6
8
10 12 14 16 18 20
Output Current (A)
Output Current (A)
Power Dissipation vs Output Current (@Vin=+12V)
16
14
12
10
8
Vout
5.0V
3.3V
2.5V
1.5V
6
4
2
0
0
2
4
6
8
10 12 14 16 18 20
Output Current (Amps)
Note: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
51
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
For assistance or to order, call (800) 531-5782
PT7720 Series
A p p l i c a t i o n
N o t e s
More Application Notes
Pin-Coded Output Voltage Adjustment on the
“Big Hammer II” Series ISRs
ming, doing so will degrade the load reglation of the prod-
uct.
4. If active devices are used to ground the voltage control pins,
low-level open drain MOSFET devices should be used over
bipolar transistors. The inherent Vce(sat) in bipolar devices
introduces errors in the device’s internal divider network.
Discrete transistors such as the BSS138, 2N7002,
IRLML2402, or the 74C906 hex open-drain buffer are
examples of appropriate devices.
Power Trends PT7720 series ISRs incorporate pin-coded volt-
age control to adjust the ouput voltage. The control pins are
identified VID0 - VID4 (pins 1, 2, 3, 4, & 6) respectively.
When the control pins are left open-circuit, the ISR output will
regulate at its factory trimmed output voltage. Each pin is inter-
nally connected to a precision resistor, which when grounded
changes the output voltage by a set amount. By selectively
grounding VID0 -VID4, the output voltage of each ISR in the
PT7720 series ISRs can be programmed in incremental steps
over its specified output voltage range. The output voltage
ranges offered by these regulators provide a convenient method
of output voltage selection for many applications. In addition,
the program code and output voltage range of the PT7721
model ISR is compatible with the voltage ID specification de-
fined by Intel Corporation for voltage regulator modules
(VRMs) used to power Pentium® microprocessors. Refer to
Figure 1 below for the connection schematic, and the PT7720
Data Sheet for the appropriate programming code information.
Active Voltage Programming:
Special precautions should be taken when making changes to the
voltage control progam code while the unit is powered. It is
highly recommended that the ISR be either powered down or
held in standby. Changes made to the program code while Vout
is enabled induces high current transients through the device.
This is the result of the electrolytic output capacitors being ei-
ther charged or discharged to the new output voltage set-point.
The transient current can be minimized by making only incre-
mental changes to the binary code, i.e. one LSB at a time. A
minimum of 100µs settling time between each program state is
also recommended. Making non-incremental changes to VID3
and VID4 with the output enabled is discouraged. If they are
changed, the transients induced can overstress the device result-
ing in a permanent drop in efficiency. If the use of active devices
prevents the program code being asserted prior to power-up,
pull pin 5 (STBY) to the device GND during the period that the
input voltage is applied to Vin. Releasing pin 5 will then allow
the device output to execute a soft-start power-up to the pro-
grammed voltage.
Notes:
1. The programming convention is as follows:-
Logic 0:
Logic 1:
Connect to pin12 (Remote Sense Ground).
Open circuit/open drain (See notes 2, & 4)
2. Do not connect pull-up resistors to the voltage program-
ming pins.
3. To minimize output voltage error, always use pin 12 (Re-
mote Sense Ground) as the logic “0” reference. While the
regular ground (pins 13-19) can also be used for program-
Figure 1
6
4
3
2
1
26
VID4 - VID0
SNS(+)
20-25
7-11
Vin
Vo
+12V
PT7720
1µH
(Optional)
Synch
STBY
5
GND
13-19
SNS(-)
12
Out
27
L
O
A
D
+
+
Cin
Cout
STBY
COM
3
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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