hip1090 Intersil Corporation, hip1090 Datasheet - Page 4

• Manufacturer Part Number: hip1090
• Description: Protected High Side Power Switch With Transient Suppression
• Manufacturer: Intersil Corporation

Figure 3 shows the pulsed output switching characteristics
of the HIP1090 as a high side driver. A small delay step is
noted on the rising edge due to the hold-off of a V
detector circuit. The V
level of the PNP pass transistor and controls the drive as a
ratio of load current. As the load current is reduced, the drive
current to the output transistor is reduced. Under low current
operation, the saturation level is controlled and the turn-OFF
switching time is much faster. The control switching element
is shown as a 2N5320 NPN transistor but may be any open
collector or MOS gate. A pull-up resistor of 2k is used for a
slight improvement in the turnoff fall time but is not an
essential requirement. The V
with a mechanical switch or may be controlled from any
driver output that can sink the worst case condition of pin 2
current, I
(typically 50mA).
OFF
ON
(SUPPLY INPUT)
FIGURE 3. TYPICAL ON-OFF SWITCHING CHARACTERISTIC
OFF
15
10
ON
5
0
OPTIONAL
+16V
CON
15 s
OF THE HIP1090 USING AN NPN TRANSISTOR TO
SWITCH THE V
2k
T
when the output load current is increased to 1A
ON
V
V
B
IN
V
B
CE
1k
SAT circuit senses the saturation
CON
CON
HIP1090
V
INPUT TERMINAL
OUT
terminal may be controlled
V
(CONTROL PIN)
2N5320
OR EQUIVALENT
CON
T
15 s
OFF
V
OUT
(OUTPUT)
24
CE
HIP1090
SAT
9-25
The circuit of Figure 4 shows how the HIP1090 transient
suppression voltage shutdown threshold may be increased
by using a zener diode from the V
tor terminal of the transistor switch. The preferred method is
to use a zener diode for a fixed level shift. While a resistor in
place of the zener diode having the same voltage drop will
work well, the parametric variation of the I
cause variations of the Over-Voltage Shutdown Threshold.
In this circuit, a 10V zener provides a typical over-voltage
threshold shift to ~27V. The threshold for over-voltage shut-
down is referenced to the (V
Also, it is important to note that high peak current values
may be reached when driving nonlinear and inductive loads.
The peak output current of the HIP1090 is self limiting in the
1A to 2A range to protect against short circuit conditions.
Sustained high peak current may increase the junction tem-
perature to 150
happens, the output current will fall off briefly before recover-
ing, unless the over-temperature condition is sustained.
Internally, both input and output over-voltage conditions are
sensed to protect the circuit, making the high levels of tran-
sient voltage ratings possible. Sustained voltage ratings of
of applications in high stress environments.
Except for the V
higher current version of the CA3273 high side driver, which
turns-on without the delayed step on the leading edge of the
output pulse; switching with a typical T
The CA3273 has a higher transient suppression threshold.
24VDC with transient ratings to 90V allow a wide variety
(SUPPLY INPUT)
FIGURE 4. A TYPICAL APPLICATION CIRCUIT THAT USES A
OFF
ON
OPTIONAL
+24V
ZENER TO THE V
RAISE
THRESHOLD
2k
o
C and cause thermal shutdown. When this
V
CE
IN
SAT detector circuit, the HIP1090 is a
THE
1k
IN
OVER-VOLTAGE
HIP1090
CON
- V
CON
CON
TRANSISTOR SWITCH TO
V
2N5320
OR EQUIVALENT
CON
10V
) voltage difference.
terminal to the collec-
ON
CON
time of ~0.5 s.
V
OUT
SHUTDOWN
current will
(OUTPUT)
24