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参数资料
| 型号： | PT4494A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 100 W DC-DC BOOSTER MODULE |
| 封装： | MODULE, SIP-26 |
| 文件页数： | 4/8页 |
| 文件大小： | 164K |
| 代理商： | PT4494A |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Increasing the Output Current of the PT4474
with the PT4494 Compatible Current Booster
The PT4494 is a 20-A “Current Booster” module
designed specifically for the PT4474 programmable
DC/DC converter. The booster is controlled directly
by the regulator, and effectively adds an additional
output stage that operates in parallel. This allows
the system to run sychronously, providing a low
noise solution. Up to two booster modules can be
connected to a PT4474 converter. Each booster
module increases the available output current by
20A. A combination of one PT4474 converter and
two PT4494 booster modules can supply up to 60A
of output current; enough to supply a large multi-
processor system. Figure 1-1 shows the connection
schematic for the regulator and current booster
combination.
A current booster is not a stand-alone product, and
can only operate with a regulator. It is housed in
the same package as its compatible regulator, and
shares the same mechanical outline. Except for an
increase in output current, the overall performance
of a converter/booster combination is identical to
that of a stand-alone converter.
Figure 1-1; Current Booster Application Schematic
Table 1-1; Booster Pin-Out Information
Pin
Function
Pin Function
1+Vin
10 +Vout
19 –Vout
2–Vin
11 +Vout
20 (–)Vsense
3
Do not connect
12 +Vout
21 Do not connect
4Vr
13 +Vout
22 Do not connect
5Va
14 –Vout
23 Do not connect
6
Do not connect
15 –Vout
24 Do not connect
7
Do not connect
16 –Vout
25 Do not connect
8+Vout
17 –Vout
26 DRV
9+Vout
18 –Vout
Notes:
1. Refer to the PT4474 specification table for the
performance of the regulator/booster combination.
2. The pin-out of the current booster modules include a
number pins identified, “Do not connect” (see Table 1-1).
These pins are not connected internally to the module
but must be soldered to a pad to preserve the unit’s
mechanical integrity.
3. A minimum of 150F of output capacitance is required
across the output of each PT4494 booster for proper
operation. A value greater than 150F will further
reduce transients due to large and/or fast load steps.
4. The converter and all boosters must be located on
the same printed circuit board. A similar footprint
and trace layout for each module will also facilitate
current sharing.
PT4474, PT4494
PT4494
PT4474
1
2
8 - 13
–V
IN
-V
OUT
+V
OUT
20
7
REMOTE SENSE (+)
REMOTE SENSE (-)
VID1
VID2
VID3
PROGRAMMING PINS
Inhibit
3
C
IN
33F
Optional
+
C
IN
33F
Optional
+
LOAD
1
8 - 13
14 - 19
+V
IN
25
VID4
24
23
22
14-19
2
4526
20
4526
C
OUT
150F
Optional
+
C
OUT
150F
Required 3
+
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| PT4494C | 功能描述:BOOSTER(PT4474) 20A 24VIN HZ SMD RoHS:是 类别:电源 - 板载 >> 配件 系列:PT4470 标准包装:1 系列:- 附件类型:测试板 适用于相关产品:- |
| PT4494N | 功能描述:BOOSTER(PT4474) 20A 24VIN VRT RoHS:是 类别:电源 - 板载 >> 配件 系列:PT4470 标准包装:1 系列:- 附件类型:测试板 适用于相关产品:- |
| PT4495 | 制造商:TI 制造商全称:Texas Instruments 功能描述:100-W 30-A Programmable Isolated DC/DC Converter |
| PT4495A | 功能描述:CONVERTER 30A BOOSTER PT4472 HRZ RoHS:是 类别:电源 - 板载 >> 配件 系列:PT4470 标准包装:1 系列:- 附件类型:测试板 适用于相关产品:- |
| PT4495C | 功能描述:CONVERTER 30A BOOSTER PT4472 SMD RoHS:是 类别:电源 - 板载 >> 配件 系列:PT4470 标准包装:1 系列:- 附件类型:测试板 适用于相关产品:- |
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