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参数资料
| 型号： | LTC1436AEGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件页数： | 7/28页 |
| 文件大小： | 493K |
| 代理商： | LTC1436AEGN#PBF |
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15
LTC1436A
LTC1436A-PLL/LTC1437A
14367afb
APPLICATIONS INFORMATION
WU
U
include Sanyo OS-CON, Nichicon PL series and Sprague
593D and 595D series. Consult the manufacturer for other
specific recommendations.
INTVCC Regulator
An internal P-channel low dropout regulator produces the
5V supply that powers the drivers and internal circuitry
within the LTC1436A/LTC1437A. The INTVCC pin can
supply up to 15mA and must be bypassed to ground with
a minimum of 2.2
F tantalum or low ESR electrolytic.
Good bypassing is necessary to supply the high transient
currents required by the MOSFET gate drivers.
High input voltage applications, in which large MOSFETs
are being driven at high frequencies, may cause the
maximum junction temperature rating for the LTC1436A/
LTC1437A to be exceeded. The IC supply current is
dominated by the gate charge supply current when not
using an output derived EXTVCC source. The gate charge
is dependent on operating frequency as discussed in the
Efficiency Considerations section. The junction tempera-
ture can be estimated by using the equations given in Note
1 of the Electrical Characteristics. For example, the
LTC1437A is limited to less than 19mA from a 30V supply:
TV
C W
C
J = 70 C + 19mA
°
()( ) °
()=°
30
95
124
/
To prevent maximum junction temperature from being
exceeded, the input supply current must be checked when
operating in continuous mode at maximum VIN.
EXTVCC Connection
The LTC1436A/LTC1437A contain an internal P-channel
MOSFET switch connected between the EXTVCC and
INTVCC pins. The switch closes and supplies the INTVCC
power whenever the EXTVCC pin is above 4.8V, and
remains closed until EXTVCC drops below 4.5V. This
allows the MOSFET driver and control power to be derived
from the output during normal operation (4.8V < VOUT <
9V) and from the internal regulator when the output is out
of regulation (start-up, short circuit). Do not apply greater
than 10V to the EXTVCC pin and ensure that EXTVCC < VIN.
Significant efficiency gains can be realized by powering
INTVCC from the output, since the VIN current resulting
from the driver and control currents will be scaled by a
factor of Duty Cycle
/Efficiency. For 5V regulators this
supply means connecting the EXTVCC pin directly to VOUT.
However, for 3.3V and other lower voltage regulators,
additional circuitry is required to derive INTVCC power
from the output.
The following list summarizes the four possible connec-
tions for EXTVCC:
1. EXTVCC left open (or grounded). This will cause INTVCC
to be powered from the internal 5V regulator resulting
in an efficiency penalty of up to 10% at high input
voltages.
2. EXTVCC connected directly to VOUT. This is the normal
connection for a 5V regulator and provides the highest
efficiency.
3. EXTVCC connected to an output-derived boost network.
For 3.3V and other low voltage regulators, efficiency
gains can still be realized by connecting EXTVCC to an
output-derived voltage which has been boosted to
greater than 4.8V. This can be done with either the
inductive boost winding as shown in Figure 4a or the
capacitive charge pump shown in Figure 4b. The charge
pump has the advantage of simple magnetics.
4. EXTVCC connected to an external supply. If an external
supply is available in the 5V to 10V range (EXTVCC <
VIN), it may be used to power EXTVCC, providing it is
compatible with the MOSFET gate drive requirements.
When driving standard threshold MOSFETs, the exter-
nal supply must always be present during operation to
prevent MOSFET failure due to insufficient gate drive.
Figure 4a. Secondary Output Loop and EXTVCC Connection
R6
R5
EXTVCC
VIN
TGL
TGS
SW
BG
PGND
LTC1436A
LTC1437A
N-CH
+
CIN
VIN
1N4148
+
1
F
+
COUT
VSEC
T1
1:N
RSENSE
VOUT
OPTIONAL EXTVCC
CONNECTION
5V
≤ VSEC ≤ 9V
1436 F04a
SFB
SGND
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