HIP4082EVAL Intersil, HIP4082EVAL Datasheet - Page 7
HIP4082EVAL
Manufacturer Part Number
HIP4082EVAL
Description
EVAL BOARD FET DRIVER HIP4082
Manufacturer
Intersil
Type
FET Driverr
Datasheet
1.HIP4082EVAL.pdf
(13 pages)
Specifications of HIP4082EVAL
Contents
Fully Assembled Evaluation Board
For Use With/related Products
HIP4082
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
The left and right half side half-bridges must be synchronized.
The left half-bridge switching is perfectly synchronized with
the minimum instances of the triangle wave and is therefore
fixed in phase with the triangle wave. The right half-bridge
slides with the level of the signal proportional to the DC bus
2
1
2
1
2
1
FIGURE 6. SECONDARY-SIDE CONTROL WAVEFORMS WITH
FIGURE 7. SECONDARY-SIDE FLIP-FLOP WAVEFORMS
CH1 = 5V
CH1 = 5V
CH1 = 5V
FIGURE 8. HIP2500 INPUT WAVEFORMS
LOWER DC BUS VOLTAGE
CH2 = 2V
CH2 = 5V
CH2 = 5V
M = 2.5µs
M = 2.5µs
M = 2.5µs
7
GLITCH CH2
GLITCH CH2
GLITCH CH2
Application Note 9611
C2 FREQ.
110.04Hz
C2 FREQ.
55.552Hz
C2 FREQ.
55.872Hz
voltage level as previously mentioned. When the triangle wave
reaches a minimum, a positive rising pulse is output at pin 3 of
the ICM7555 timer, U
flop which will either result in a high level at U
outputs, depending on the state of the data, D, input pin. It is
not important which goes high first, only that the toggling of
the Q and QNOT outputs of U
clock pulse from pin 3 of U
low each time that the triangle wave reaches a peak.
Of paramount importance, however, is the need to
synchronize the state of U
those of U
drive the upper left MOSFET in the left half-bridge (QNOT
obviously drives the lower MOSFET). It is necessary that
whenever the upper MOSFET of the left half-bridge is gated
that the lower MOSFET in the right half-bridge also will be
gated sometime within the same half-cycle. To guarantee that
this happens it is necessary to connect either the Q or QNOT
output of U
U
is chosen to drive the D input of U
the phase-shifted clock which goes to U
must gate the lower right MOSFET, which corresponds to the
LIN input of the right half-bridge driver, U
output signal of U
QNOT signal of U
The waveforms in Figure 4 show the phase voltage
waveforms of the left and right half-bridges and the resulting
output voltage waveform shown in Figure 3. Notice that the
algebraic difference between Trace 2 and Trace 1 waveforms
precisely result in a waveform like that of Figure 3.
Unlike the HIP4082 and other members of the HIP408X
family, the HIP2500 high voltage half-bridge driver requires
external circuitry to insure that the upper and lower
MOSFETs in a half-bridge leg do not conduct
simultaneously. The quad AND-gate, U
R
needs of any application. Each Q and QNOT output from the
flip-flops go directly to one input of a two input AND-gate and
also through an R-C delay to the 2nd input of the AND-gate.
Only after the R-C delay can the output of an AND-gate go
high. Conversely, when any of the Q or QNOT outputs go
low, a zero is placed on one of the AND-gate inputs and the
AND-gate’s output immediately goes low. Therefore an ON-
DELAY is produced, but no corresponding OFF-DELAY is
produced.
Overcurrent Protection
An instantaneous overcurrent function senses the voltage
drop across R
secondary-side inverter. The circuit comprising U
R
the current trip level. The values shown in the schematic
should cause overcurrent trip at approximately 1.3A. The
voltage on the negative summing junction of U
5A
27
29
, and capacitors C
, R
, which corresponds to the upper left MOSFET gate drive,
32
, R
5A
5A
36
. Arbitrarily the Q output of U
to the data, D, input of U
23
, shunt resistor R
for the purposes of shutting down the
5B
5B
must drive the LIN input of U
must drive the HIN input of U
8
. This rising edge ‘clocks’ the U
14
-C
5B
8
17
. The timer’s output, pin 3, goes
’s Q and QNOT outputs with
5A
tailor the dead-time to the
23
alternate at each positive
5B
and capacitor, C
, the next clock pulse from
5B
5B
6
9
. If the Q output of
, and resistors R
5A
. Therefore the Q
’s clock input pin
was chosen to
5A
7A
’s Q or QNOT
9
dictates the
9
7A
and the
.
32
, R
5A
dictate
28
flip-
24
,
-