The MC34151/MC33151 are dual inverting high speed drivers
specifically designed for applications that require low current digital
circuitry to drive large capacitive loads with high slew rates. These
devices feature low input current making them CMOS and LSTTL
logic compatible, input hysteresis for fast output switching that is
independent of input transition time, and two high current totem pole
outputs ideally suited for driving power MOSFETs. Also included is
an undervoltage lockout with hysteresis to prevent erratic system
operation at low supply voltages.
Typical applications include switching power supplies, dc to dc
converters, capacitor charge pump voltage doublers/inverters, and
motor controllers.
These devices are available in dual–in–line and surface mount
packages.
• T wo Independent Channels with 1.5 A Totem Pole Output
• Output Rise and Fall Times of 15 ns with 1000 pF Load
• CMOS/LSTTL Compatible Inputs with Hysteresis
• Undervoltage Lockout with Hysteresis
• Low Standby Current
• Efficient High Frequency Operation
• Enhanced System Performance with Common Switching Regulator
Control ICs
• Pin Out Equivalent to DS0026 and MMH0026
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MARKING
DIAGRAMS
8
PDIP–8
P SUFFIX
8
1
8
1
x= 3 or 4
A= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W= Work Week
Totem Pole Sink or Source Current
Diode Clamp Current (Drive Output to VCC)
Power Dissipation and Thermal Characteristics
D Suffix SO–8 Package Case 751
Maximum Power Dissipation @ TA = 50°C
Thermal Resistance, Junction–to–Air
P Suffix 8–Pin Package Case 626
Maximum Power Dissipation @ TA = 50°C
Thermal Resistance, Junction–to–Air
Operating Junction TemperatureT
Operating Ambient Temperature
MC34151
MC33151
Storage Temperature RangeT
I
CC
in
I
O
O(clamp)
P
D
R
θJA
P
D
R
θJA
J
T
A
stg
20V
–0.3 to V
–65 to +150°C
CC
1.5
1.0
0.56
180
1.0
100
+150°C
0 to +70
–40 to +85
°C/W
°C/W
°C
V
A
W
W
ELECTRICAL CHARACTERISTICS (V
Characteristics
LOGIC INPUTS
Input Threshold Voltage – High State Logic 1
Input Threshold Voltage – Low State Logic 0
Input Current – High State (VIH = 2.6 V)
Input Current – Low State (VIL = 0.8 V)
DRIVE OUTPUT
Output Voltage – Low State (I
Output Voltage – Low State (I
Output Voltage – Low State (I
Output Voltage – High State (I
Output Voltage – High State (I
Output Voltage – High State (I
50% Duty Cycle
Both Drive Outputs Loaded
TA = 25°C
40
, SUPPLY CURRENT (mA)
20
CC
I
0
f = 500 kHz
CL, OUTPUT LOAD CAPACITANCE (nF)
f = 200 kHz
f = 50 kHz
Figure 14. Supply Current versus Drive Output
Load Capacitance
8.0
TA = 25°C
6.0
4.0
, SUPPLY CURRENT (mA)
2.0
CC
I
Logic Inputs at V
Low State Drive Outputs
CC
Logic Inputs Grounded
High State Drive Outputs
0
10 k
f, INPUT FREQUENCY (Hz)
Figure 15. Supply Current versus Input FrequencyFigure 16. Supply Current versus Supply Voltage
1001.0 M
0
04.08.01216
VCC, SUPPLY VOLTAGE (V)
APPLICATIONS INFORMATION
Description
The MC34151 is a dual inverting high speed driver
specifically designed to interface low current digital
circuitry with power MOSFET s. This device is constructed
with Schottky clamped Bipolar Analog technology which
offers a high degree of performance and ruggedness in
hostile industrial environments.
Output Stage
Each totem pole Drive Output is capable of sourcing and
sinking up to 1.5 A with a typical ‘on’ resistance of 2.4 Ω at
1.0 A. The low ‘on’ resistance allows high output currents
to be attained at a lower VCC than with comparative CMOS
drivers. Each output has a 100 kΩ pull–down resistor to keep
the MOSFET gate low when VCC is less than 1.4 V . No over
current or thermal protection has been designed into the
Input Stage
The Logic Inputs have 170 mV of hysteresis with the input
threshold centered at 1.67 V. The input thresholds are
insensitive to VCC making this device directly compatible
with CMOS and LSTTL logic families over its entire
operating voltage range. Input hysteresis provides fast
output switching that is independent of the input signal
transition time, preventing output oscillations as the input
thresholds are crossed. The inputs are designed to accept a
signal amplitude ranging from ground to VCC. This allows
the output of one channel to directly drive the input of a
second channel for master–slave operation. Each input has
a 30 kΩ pull–down resistor so that an unconnected open
input will cause the associated Drive Output to be in a known
high state.
device, so output shorting to VCC or ground must be
avoided.
Parasitic inductance in series with the load will cause the
driver outputs to ring above VCC during the turn–on
transition, and below ground during the turn–off transition.
With CMOS drivers, this mode of operation can cause a
destructive output latch–up condition. The MC34151 is
immune to output latch–up. The Drive Outputs contain an
internal diode to VCC for clamping positive voltage
transients. When operating with VCC at 18 V, proper power
supply bypassing must be observed to prevent the output
ringing from exceeding the maximum 20 V device rating.
Negative output transients are clamped by the internal NPN
pull–up transistor. Since full supply voltage is applied across
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MC34151, MC33151
16
the NPN pull–up during the negative output transient, power
dissipation at high frequencies can become excessive.
Figures 19, 20, and 21 show a method of using external
Schottky diode clamps to reduce driver power dissipation.
gate charge information on their data sheets. Figure 17
shows a curve of gate voltage versus gate charge for the ON
Semiconductor MTM15N50. Note that there are three
distinct slopes to the curve representing different input
capacitance values. To completely switch the MOSFET
Undervoltage Lockout
An undervoltage lockout with hysteresis prevents erratic
system operation at low supply voltages. The UVLO forces
the Drive Outputs into a low state as VCC rises from 1.4 V
to the 5.8 V upper threshold. The lower UVLO threshold is
‘on’, the gate must be brought to 10 V with respect to the
source. The graph shows that a gate charge Qg of 110 nC is
required when operating the MOSFET with a drain to source
voltage VDS of 400 V.
5.3 V, yielding about 500 mV of hysteresis.
12
MTM15N50
ID = 15 A
TA = 25°C
VDS = 100 V
VDS = 400 V
Power Dissipation
Circuit performance and long term reliability are
enhanced with reduced die temperature. Die temperature
increase is directly related to the power that the integrated
circuit must dissipate and the total thermal resistance from
the junction to ambient. The formula for calculating the
8.0
8.9 nF
junction temperature with the package in free air is:
TJ =TA + PD (R
θJA
)
where:TJ = Junction Temperature
TA = Ambient Temperature
PD = Power Dissipation
R
Thermal Resistance Junction to Ambient
θJA =
There are three basic components that make up total
power to be dissipated when driving a capacitive load with
4.0
, GATE–TO–SOURCE VOLTAGE (V)
V
GS
2.0 nF
0
04080120160
Qg, GATE CHARGE (nC)
Figure 17. Gate–T o–Source Voltage
versus Gate Charge
CGS =
∆ V
∆ Q
g
GS
respect to ground. They are:
PD =PQ + PC + P
T
where:PQ = Quiescent Power Dissipation
PC = Capacitive Load Power Dissipation
PT = Transition Power Dissipation
The quiescent power supply current depends on the
supply voltage and duty cycle as shown in Figure 16. The
device’s quiescent power dissipation is:
PQ = VCC I
CCL
(1–D) + I
CCH
(D)
The capacitive load power dissipation is directly related to
the required gate charge, and operating frequency. The
capacitive load power dissipation per driver is:
P
C(MOSFET)
= VC Qg f
The flat region from 10 nC to 55 nC is caused by the
drain–to–gate Miller capacitance, occurring while the
MOSFET is in the linear region dissipating substantial
amounts of power . The high output current capability of the
MC34151 is able to quickly deliver the required gate charge
for fast power efficient MOSFET switching. By operating
where:I
The capacitive load power dissipation is directly related
to the load capacitance value, frequency, and Drive Output
voltage swing. The capacitive load power dissipation per
driver is:
where:VOH = High State Drive Output Voltage
When driving a MOSFET, the calculation of capacitive
load power PC is somewhat complicated by the changing
gate to source capacitance CGS as the device switches. T o aid
= Supply Current with Low State Drive
CCL
Outputs
I
= Supply Current with High State Drive
CCH
Outputs
D = Output Duty Cycle
PC =VCC (VOH – VOL) CL f
VOL = Low State Drive Output Voltage
CL = Load Capacitance
f = frequency
the MC34151 at a higher VCC, additional charge can be
provided to bring the gate above 10 V. This will reduce the
‘on’ resistance of the MOSFET at the expense of higher
driver dissipation at a given operating frequency.
The transition power dissipation is due to extremely short
simultaneous conduction of internal circuit nodes when the
Drive Outputs change state. The transition power
dissipation per driver is approximately:
PT 9 VCC (1.08 VCC CL f – 8 y 10–4)
PT must be greater than zero.
Switching time characterization of the MC34151 is
performed with fixed capacitive loads. Figure 13 shows that
for small capacitance loads, the switching speed is limited
by transistor turn–on/off time and the slew rate of the
internal nodes. For large capacitance loads, the switching
speed is limited by the maximum output current capability
of the integrated circuit.
in this calculation, power MOSFET manufacturers provide
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MC34151, MC33151
LAYOUT CONSIDERATIONS
High frequency printed circuit layout techniques are
imperative to prevent excessive output ringing and overshoot.
Do not attempt to construct the driver circuit on
wire–wrap or plug–in prototype boards. When driving
large capacitive loads, the printed circuit board must contain
a low inductance ground plane to minimize the voltage spikes
induced by the high ground ripple currents. All high current
loops should be kept as short as possible using heavy copper
runs to provide a low impedance high frequency path. For
V
CC
0.1
47
6
TL494
or
TL594
+
++
–
+
5.7V
+
2
100k100k
+
+
4
V
in
7
5
optimum drive performance, it is recommended that the
initial circuit design contains dual power supply bypass
capacitors connected with short leads as close to the VCC pin
and ground as the layout will permit. Suggested capacitors are
a low inductance 0.1 µF ceramic in parallel with a 4.7 µF
tantalum. Additional bypass capacitors may be required
depending upon Drive Output loading and circuit layout.
Proper printed circuit board layout is extremely
critical and cannot be over emphasized.
V
in
+
R
g
D
100k
1
1N5819
3
The MC34151 greatly enhances the drive capabilities of common switching
regulators and CMOS/TTL logic devices.
Figure 18. Enhanced System Performance with
Common Switching Regulators
+
+
7
100k100k
+
3
4 X
1N5819
+
5
Series gate resistor Rg may be needed to damp high frequency parasitic
oscillations caused by the MOSFET input capacitance and any series
wiring inductance in the gate–source circuit. Rg will decrease the
MOSFET switching speed. Schottky diode D1 can reduce the driver’s
power dissipation due to excessive ringing, by preventing the output pin
from being driven below ground.
Figure 19. MOSFET Parasitic Oscillations
+
100k
3
Isolation
Boundary
1N
5819
Output Schottky diodes are recommended when driving inductive loads at
high frequencies. The diodes reduce the driver’s power dissipation by
preventing the output pins from being driven above VCC and below ground.
Figure 20. Direct Transformer DriveFigure 21. Isolated MOSFET Drive
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MC34151, MC33151
V
I
in
+
R
R
g(on)
g(off)
100k
B
+
0
–
+
Base Charge
Removal
100k
V
in
C
1
In noise sensitive applications, both conducted and radiated EMI can
be reduced significantly by controlling the MOSFET’s turn–on and
turn–off times.
The totem–pole outputs can furnish negative base current for enhanced
transistor turn–off, with the addition of capacitor C1.
The capacitor’s equivalent series resistance limits the Drive Output Current
to 1.5 A. An additional series resistor may be required when using tantalum or
other low ESR capacitors.
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETER.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
MILLIMETERS
DIM MINMAX
A1.351.75
A10.100.25
B0.350.49
C0.190.25
D4.805.00
E
3.804.00
1.27 BSCe
H5.806.20
h
0.250.50
L0.401.25
0 7
q
__
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Notes
MC34151, MC33151
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Notes
MC34151, MC33151
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MC34151, MC33151
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty , representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability ,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
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12
MC34151/D
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