KH232AM datasheet(5/6 Pages) CADEKA

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KH232

DATA SHEET

REV. 1A January 2004

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 VCC Operation: Supply Current Adjustment

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 (ICC) must be

increased. The plot of Bandwidth vs. VCC, shows the

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

values of VCC, external resistors between pins 1 and 2

and pins 8 and 9 can be used.

P(circuit) = (ICC)((+VCC) – (VCC)) where ICC = 14mA at ±15V

P(xxx) = [(±VCC) – Vout – (Icol) (Rcol + 4)] (Icol) (%Duty)

For positive Vo and VCC, this is the power in the npn

device. For negative Vo and VCC, this is the power in the

pnp device.

Icol = Vo/RL or 12mA, whichever is greater. (Include feed-

back R in RL.)

Rcol is a resistor (33Ω recommended) between the xxx

collector and ±VCC.

The limiting factor for output current and voltage is junction

temperature. Of secondary importance is I(out), which

should not exceed 150mA.

Tj(pnp) = P(pnp) (100 + θca) + (P(cir) + P(npn))(θca) + Ta,

similar for Tj(npn).

Tj(cir) = P(cir)(48 + θca) + (P(pnp) + P(npn))(θca) + Ta.

ca = 65°C/W for the KH232 without heat sink in still air.

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.)

For example, with the KH232 operating at ±15V while

driving a 100

Ω load at 15V

pp output (50% duty cycle

pulse waveform, DC = 0), P(npn) = P(pnp) = 190mW (Rcol

= 33) and P(cir) = 0.42W. Then with the Thermalloy

2268 heat sink and air flow of 300 ft/min the output

transistors’ Tj is 31°C above ambient and worst case Tj in

the rest of the circuit is 32°C above ambient. In still air,

however, the rise in Tj is 47°C and 48°C, respectively.

With no heat sink, the rise in Tj is 71°C and 72°C,

respectively! Under most conditions, HEAT SINKING IS

REQUIRED.

Tambient

θca

Tcase

°C/W

Tj(circuit)

Pcircuit

100

°C/W

Tj(npn)

Pnpn

100

°C/W

Ppnp

Tj(pnp)

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