kh232 Fairchild Semiconductor, kh232 Datasheet - Page 5

• Manufacturer Part Number: kh232
• Description: Low Distortion Wideband Op Amp
• Manufacturer: Fairchild Semiconductor

KH232
P
P
For positive V
device. For negative V
pnp device.
I
back R in R
R
collector and ±V
The limiting factor for output current and voltage is junction
temperature. Of secondary importance is I
should not exceed 150mA.
T
similar for T
T
θ
For example, with the KH232 operating at ±15V while
driving a 100Ω load at 15V
pulse waveform, DC = 0), P
= 33) and P
2268 heat sink and air flow of 300 ft/min the output
transistors’ T
the rest of the circuit is 32°C above ambient. In still air,
however, the rise in T
With no heat sink, the rise in T
respectively! Under most conditions, HEAT SINKING IS
REQUIRED.
REV. 1A February 2001
col
ca
j(pnp)
j(cir)
(circuit)
(xxx)
col
= V
= 65°C/W for the KH232 without heat sink in still air.
is a resistor (33Ω recommended) between the xxx
= P
100°C/W
= [(±V
35°C/W for the KH232 with a Thermalloy 2268A
heat sink in still air.
15°C/W for the KH232 with a Thermalloy 2268A
heat sink at 300 ft/min air.
(Thermalloy 2240A works equally as well.)
= P
o
P
T
= (I
/R
pnp
j(pnp)
(cir)
L
(pnp)
CC
or 12mA, whichever is greater. (Include feed-
j(npn)
L
(48 + θ
CC
j
.)
)((+V
(cir)
is 31°C above ambient and worst case T
o
) – V
(100 + θ
CC
.
and V
= 0.42W. Then with the Thermalloy
CC
.
100°C/W
ca
out
P
) – (V
T
) + (P
npn
j(npn)
o
– (I
CC
j
ca
is 47°C and 48°C, respectively.
and V
, this is the power in the npn
) + (P
CC
col
(pnp)
(npn)
)) where I
) (R
pp
CC
(cir)
+ P
col
output (50% duty cycle
, this is the power in the
= P
48
P
+ P
°
T
j
+ 4)] (I
(npn)
circuit
C/W
j(circuit)
(pnp)
is 71°C and 72°C,
CC
(npn)
)(θ
= 14mA at ±15V
= 190mW (R
col
ca
)(θ
) + T
) (%Duty)
(out)
+
ca
-
) + T
T
θ
T
ca
case
ambient
, which
a
.
a
,
j
col
in
Other methods of heat sinking may be used, but for
best results, make contact with the base of the KH232
package, use a large thermal capacity heat sink and use
forced air convection.
Low V
The KH232 is designed to operate on supplies as low
as ±5V. In order to improve full bandwidth at reduced
supply voltages, the supply current (I
increased. The plot of Bandwidth vs. V
effect of shorting pins 1 and 2 and pins 8 and 9; this
will increase both bandwidth and supply current. Care
should be taken to not exceed the maximum junction
temperatures; for this reason this technique should not be
used with supplies exceeding ±10V. For intermediate val-
ues of V
pins 8 and 9 can be used.
CC
CC
Operation: Supply Current Adjustment
, external resistors between pins 1 and 2 and
CC
CC
, shows the
) must be
DATA SHEET
5