Apex Digital PA40 manual Description, Typical Application, Equivalent Schematic, Features

M I C R O T E C H N O L O G Y

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

PA40

HTTP://WWW . APEXMICROTECH . COM (800) 546 - APEX (800) 546 - 2739

FEATURES

•MONOLITHIC MOS TECHNOLOGY

•LOW COST

•HIGH VOLTAGE OPERATION—250V

•LOW QUIESCENT CURRENT—2mA

•NO SECOND BREAKDOWN

•HIGH OUTPUT CURRENT—120 mA PEAK

APPLICATIONS

•TELEPHONE RING GENERATOR

•PIEZO ELECTRIC POSITIONING

•ELECTROSTATIC TRANSDUCER & DEFLECTION

•DEFORMABLE MIRROR FOCUSING

DESCRIPTION

The PA40 is a high voltage monolithic MOSFET operational amplifier achieving performance features previously found only in hybrid designs while increasing reliability. Inputs are protected from excessive common mode and differential mode voltages. The safe operating area (SOA) has no second breakdown limitations. External compensation provides the user flexibility in choosing optimum gain and bandwidth for the application.

The PA40 is packaged in Apex's 7 LEAD TO220 package. The metal back of the package is tied to –Vs. The 15 mil minimum spacing of the TO220 package is adequate to stand-off the 250V rating of the PA40. The user must insure that a minimum of 11 mils spacing is maintained between pins for the circuit board artwork. If spacing is less than 11 mils, the voltage must be derated.

TYPICAL APPLICATION

			2.67K	140V	100K
			IN6300A
		15V		.22
	2.5K + 15
					MUR130
				3.3pF
	10K	10K	MUR120		2.2K
	4	5	6
	7				90Vrms
			2	PA40
	ICL8038
	8
	10	11	IN6300A		100
			82K	.22	330pf
	*
* 1.5 ∝F @ 16Hz			MUR120	–140V	MUR130
		–15V
1.2	∝F @ 20Hz		Telephone Ring Generator

The PA40 is set for a gain of 38.5 boosting the 2.33V signal to 90V. The recommended compensation for gains above 30 is used. If capacitive loading is at least 330pF at all times, the recommended snubber network may be omitted.

EQUIVALENT SCHEMATIC

						3
				D1		+VS
	Q1				Q2
					Q3	IOUT
Q4			Q5			5
1				6	Q6
–IN				COMP
D2	D3	D4	D5	COMP Q8
2				7
+IN	Q11
					Q10
			Q12		Q13
					Q14
						–VS
						4
					SUB

EXTERNAL CONNECTIONS

PHASE COMPENSATION

≤	Gain	CC	RC
	1	18pF	2.2K
≥	10	10pF	2.2K
≥	≥ 30	3.3pF	2.2K

NOTE: At gains above 30, Rc and Cc may be omitted.

1 2 3 4 5 6 7

- IN + IN +VS -VS OUT COMP (Rc) COMP (Cc)

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com