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TC1427 Datasheet(PDF) 6 Page - Microchip Technology

Part # TC1427
Description  1.2A Dual High-Speed MOSFET Drivers
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1427 Datasheet(HTML) 6 Page - Microchip Technology

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TC1426/TC1427/TC1428
DS21393C-page 6
© 2006 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 1000
pF load to 16V in 25 nsec requires a 0.8A current from
the device's power supply.
To ensure low supply impedance over a wide frequency
range, a parallel capacitor combination is recom-
mended 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 2.5 mA current source
load. With a logic ‘1’ input, the maximum quiescent
supply current is 9 mA. 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 100 mV 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
WIMA
MKS-2
0V
0V
TC1426
(1/2 TC1428)
1
2
Test Circuit
0.1
μF MLC
Input
VDD = 16V
Output
tR
CL = 1000 pF
tD1
tF
tD2
Input
Output
VDD
0.1
μF MLC
Input
VDD = 16V
Output
tR
CL = 1000 pF
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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