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TC1426 Folha de dados(PDF) 6 Page - Microchip Technology

Nome de Peças TC1426
Descrição Electrónicos  1.2A Dual High-Speed MOSFET Drivers
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1426 Folha de dados(HTML) 6 Page - Microchip Technology

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TC1426/TC1427/TC1428
DS21393B-page 6
 2002 Microchip Technology Inc.
3.0
APPLICATIONS INFORMATION
3.1
SUPPLY BYPASSING
Large currents are required to charge and discharge
capacitive loads quickly. For example, charging a
1000pF load to 16V in 25nsec requires a 0.8A current
from the device’s power supply.
To guarantee low supply impedance over a wide
frequency range, a parallel capacitor combination is
recommended for supply bypassing. Low-inductance
ceramic MLC capacitors with short lead lengths
(<0.5-in.) should be used. A 1.0
µF film capacitor in
parallel with one or two 0.1
µF ceramic MLC capacitors
normally provides adequate bypassing.
3.2
GROUNDING
The TC1426 and TC1428 contain inverting drivers.
Individual ground returns for the input and output
circuits or a ground plane should be used. This will
reduce negative feedback that causes degradation in
switching speed characteristics.
FIGURE 3-1:
INVERTING DRIVER
SWITCHING TIME
3.3
INPUT STAGE
The input voltage level changes the no-load or
quiescent supply current. The N-channel MOSFET
input stage transistor drives a 2.5mA current source
load. With a logic "1" input, the maximum quiescent
supply current is 9mA. Logic "0" input level signals
reduce quiescent current to 500
µA maximum. Unused
driver inputs must be connected to VDD or GND.
Minimum power dissipation occurs for logic "0" inputs
for the TC1426/TC1427/TC1428.
The drivers are designed with 100mV of hysteresis.
This provides clean transitions and minimizes output
stage current spiking when changing states. Input
voltage thresholds are approximately 1.5V, making a
logic "1" input any voltage greater than 1.5V up to VDD.
Input current is less than 1
µA over this range.
The TC1426/TC1427/TC1428 may be directly driven
by the TL494, SG1526/27, TC38C42, TC170 and
similar switch-mode power supply integrated circuits.
FIGURE 3-2:
NONINVERTING DRIVER
SWITCHING TIME
+5V
10%
90%
10%
90%
10%
90%
VDD
1
µF
MKS-2
0V
0V
TC1426
(1/2 TC1428)
1
2
Test Circuit
0.1
µF MLC
Input
VDD = 16V
Output
tR
CL = 1000pF
tD1
tF
tD2
Input
Output
VDD
0.1
µF MLC
Input
VDD = 16V
Output
tR
CL = 1000pF
tD1
tF
tD2
Input
Output
90%
10%
10%
10%
90%
1
µF
WIMA
MKS-2
TC1427
(1/2 TC1428)
+5V
0V
0V
90%
Test Circuit
1
2


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