Motorola MC34060AD, MC34060ADR2, MC34060AP, MC33060AP, MC33060AD Datasheet

Order this document by MC34060A/D

Precision SWITCHMODE

Pulse Width Modulator

Control Circuit

The MC34060A is a low cost fixed frequency, pulse width modulation control circuit designed primarily for single±ended SWITCHMODE power supply control.

The MC34060A is specified over the commercial operating temperature range of 0° to +70°C, and the MC33060A is specified over an automotive temperature range of ±40° to +85°C.

•Complete Pulse Width Modulation Control Circuitry

•On±Chip Oscillator with Master or Slave Operation

•On±Chip Error Amplifiers

•On±Chip 5.0 V Reference, 1.5% Accuracy

•Adjustable Dead±Time Control

•Uncommitted Output Transistor Rated to 200 mA Source or Sink

•Undervoltage Lockout

PIN CONNECTIONS

Noninv	1	+			+	14	Noninv
Input							Input
		Error	1	2	Error
Inv		Amp			Amp		Inv
	2	±			±	13
Input				VCC			Input
Compen/PWM	3				5.0 V	12	Vref
Comp Input					ref
Dead±Time		0.1V
	4					11	N.C.
Control
CT	5					10	VCC
		Oscillator
RT	6					9	C
						Q1
Ground	7					8	E

(Top View)

MC34060A

MC33060A

PRECISION SWITCHMODE PULSE WIDTH MODULATOR CONTROL CIRCUIT

SEMICONDUCTOR

TECHNICAL DATA

14

1

P SUFFIX

PLASTIC PACKAGE

CASE 646

14

1

D SUFFIX

PLASTIC PACKAGE

CASE 751A (SO±14)

ORDERING INFORMATION

		Operating
	Device	Temperature Range	Package
	MC34060AD	TA = 0° to +70°C	SO±14
	MC34060AP		Plastic DIP
	MC33060AD	TA = ± 40° to +85°C	SO±14
	MC33060AP		Plastic DIP

Motorola, Inc. 1996

Rev 1

MC34060A MC33060A

MAXIMUM RATINGS (Full operating ambient temperature range applies, unless otherwise noted.)

Rating	Symbol	Value	Unit
Power Supply Voltage	VCC	42	V
Collector Output Voltage	VC	42	V
Collector Output Current (Note 1)	IC	500	mA
Amplifier Input Voltage Range	Vin	±0.3 to +42	V
Power Dissipation @ TA ≤ 45°C	PD	1000	mW
Operating Junction Temperature	TJ	125	°C
Storage Temperature Range	Tstg	±55 to +125	°C
Operating Ambient Temperature Range	TA		°C
For MC34060A		0 to +70
For MC33060A		±40 to +85

NOTES: 1. Maximum thermal limits must be observed.

THERMAL CHARACTERISTICS

		P Suffix	D Suffix
Characteristics	Symbol	Package	Package	Unit
Thermal Resistance, Junction±to±Ambient	RθJA	80	120	°C/W
Derating Ambient Temperature	TA	45	45	°C

RECOMMENDED OPERATING CONDITIONS

Condition/Value	Symbol	Min	Typ	Max	Unit
Power Supply Voltage	VCC	7.0	15	40	V
Collector Output Voltage	VC	±	30	40	V
Collector Output Current	IC	±	±	200	mA
Amplifier Input Voltage	Vin	±0.3	±	VCC ±2	V
Current Into Feedback Terminal	Ifb	±	±	0.3	mA
Reference Output Current	Iref	±	±	10	mA
Timing Resistor	RT	1.8	47	500	kΩ
Timing Capacitor	CT	0.00047	0.001	10	μF
Oscillator Frequency	fosc	1.0	25	200	kHz
PWM Input Voltage (Pins 3 and 4)	±	±0.3	±	5.3	V

ELECTRICAL CHARACTERISTICS (VCC = 15 V, CT = 0.01 μF, RT = 12 kΩ, unless otherwise noted. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.)

Characteristics	Symbol	Min	Typ	Max	Unit
REFERENCE SECTION
Reference Voltage (IO = 1.0 mA, TA 25°C)	Vref	4.925	5.0	5.075	V
TA = Tlow to Thigh ± MC34060A		4.9	±	5.1
± MC33060A		4.85	±	5.1
Line Regulation	Regline	±	2.0	25	mV
(VCC = 7.0 V to 40 V, IO = 10 mA))
Load Regulation	Regload	±	2.0	15	mV
(IO = 1.0 mA to 10 mA)
Short Circuit Output Current	ISC	15	35	75	mA
(Vref = 0 V)

2	MOTOROLA ANALOG IC DEVICE DATA

MC34060A MC33060A

ELECTRICAL CHARACTERISTICS (VCC = 15 V, CT = 0.01 μF, RT = 12 kΩ, unless otherwise noted. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.)

Characteristics			Symbol	Min	Typ		Max	Unit
OUTPUT SECTION
Collector Off±State Current			IC(off)	±	2.0		100	μA
(VCC = 40 V, VCE = 40 V)
Emitter Off±State Current			IE(off)	±	±		±100	μA
(VCC = 40 V, VCE = 40 V, VE = 0 V)
Collector±Emitter Saturation Voltage (Note 2)			Vsat(C)	±	1.1		1.5	V
Common±Emitter
(VE = 0 V, IC = 200 mA)
Emitter±Follower			Vsat(E)	±	1.5		2.5
(VC = 15 V, IE = ±200 mA)
Output Voltage Rise Time (TA = 25°C)			tr					ns
Common±Emitter (See Figure 12)				±	100		200
Emitter±Follower (See Figure 13)				±	100		200
Output Voltage Fall Time (TA = 25°C)			tr					ns
Common±Emitter (See Figure 12				±	40		100
Emitter±Follower (See Figure 13)				±	40		100
ERROR AMPLIFIER SECTION
Input Offset Voltage			VIO	±	2.0		10	mV
(VO[Pin 3] = 2.5 V)
Input Offset Current			IIO	±	5.0		250	nA
(VC[Pin 3] = 2.5 V)
Input Bias current			IIB	±	±0.1		±2.0	μA
(VO[Pin 3] = 2.5 V)
Input Common Mode Voltage Range			VICR	0 to	±		±	V
(VCC = 40 V)				VCC ±2.0
Inverting Input Voltage Range			VIR(INV)	±0.3 to	±		±	V
				VCC±2.0
Open±Loop Voltage Gain			AVOL	70	95		±	dB
( VO = 3.0 V, VO = 0.5 V to 3.5 V, RL = 2.0 kΩ)
Unity±Gain Crossover Frequency			fc	±	600		±	kHz
(VO = 0.5 V to 3.5 V, RL = 2.0 kΩ)
Phase Margin at Unity±Gain			φm	±	65		±	deg.
(VO = 0.5 V to 3.5 V, RL = 2.0 kΩ)
Common Mode Rejection Ratio			CMRR	65	90		±	dB
(VCC = 40 V, Vin = 0 V to 38 V))
Power Supply Rejection Ratio			PSRR	±	100		±	dB
( VCC = 33 V, VO = 2.5 V, RL = 2.0 kΩ)
Output Sink Current			IO±	0.3	0.7		±	mA
(VO[Pin 3] = 0.7 V)
Output Source Current			IO+	±2.0	±4.0		±	mA
(VO[Pin 3] = 3.5 V)
NOTES: 2. Low duty cycle techniques are used during test to maintain junction temperature as close to ambient temperatures as possible.
Tlow = ±40°C for MC33060A	Thigh = +85°C for MC33060A
= 0°C for MC34060A		= +70°Cfor MC34060A

MOTOROLA ANALOG IC DEVICE DATA	3

MC34060A MC33060A

ELECTRICAL CHARACTERISTICS (VCC = 15 V, CT = 0.01 μF, RT = 12 kΩ, unless otherwise noted. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

PWM COMPARATOR SECTION (Test circuit Figure 11)

Input Threshold Voltage

VTH

±

3.5

4.5

V

(Zero Duty Cycle)

Input Sink Current

II

0.3

0.7

±

mA

(V[Pin 3] = 0.7 V)

DEAD±TIME CONTROL SECTION (Test circuit Figure 11)

Input Bias Current (Pin 4)

IIB(DT)

±

±1.0

±10

μA

(Vin = 0 V to 5.25 V)

Maximum Output Duty Cycle

DCmax

%

(Vin = 0 V, CT = 0.01 μF, RT = 12 kΩ)

90

96

100

(Vin = 0 V, CT = 0.001 μF, RT = 47 kΩ)

±

92

±

Input Threshold Voltage (Pin 4)

VTH

V

(Zero Duty Cycle)

±

2.8

3.3

(Maximum Duty Cycle)

0

±

±

OSCILLATOR SECTION

Frequency

fosc

kHz

(CT = 0.01 μF, RT = 12 kΩ, TA = 25°C)

9.7

10.5

11.3

TA = Tlow to Thigh ± MC34060A

9.5

±

11.5

± MC33060A

9.0

±

11.5

(CT = 0.001 μF, RT = 47 kΩ)

±

25

±

Standard Deviation of Frequency*

σfosc

±

1.5

±

%

(CT = 0.001 μF, RT = 47 kΩ)

Frequency Change with Voltage

fosc(

V)

±

0.5

2.0

%

(VCC = 7.0 V to 40 V)

Frequency Change with Temperature

fosc(

T)

%

( TA =Tlow to Thigh)

±

4.0

±

(CT = 0.01 μF, RT = 12 kΩ)

±

±

±

UNDERVOLTAGE LOCKOUT SECTION

Turn±On Threshold (VCC increasing, Iref = 1.0 mA)

Vth

4.0

4.7

5.5

V

Hysteresis

VH

50

150

300

mV

TOTAL DEVICE

Standby Supply Current

ICC

mA

(Pin 6 at Vref, all other inputs and outputs open)

(VCC = 15 V)

±

5.5

10

(VCC = 40 V)

±

7.0

15

Average Supply Current

IS

±

7.0

±

mA

(V[Pin 4] = 2.0 V, CT = 0.001 μF, RT = 47 kΩ). See Figure 11.

N

±x)2

*Standard deviation is a measure of the statistical distribution about the mean as derived from the formula; σ =

Σ (x

n

n ± 1

N ±1

4	MOTOROLA ANALOG IC DEVICE DATA

			MC34060A MC33060A
			Figure 1. Block Diagram
	6					Reference	10
		Oscillator						VCC
	5					Regulator
RT				Dead±Time	Undervoltage
CT							12
			±	Comparator	Lockout	±		Ref Out
	4	0.12V
Dead±Time			+			+
Control
		0.7V				VTH
			±
			+	PWM.			9	Collector
						Q1
		≈ 0.7mA		Comparator			8	Emitter

	+		+
	1		2
	±		±
1	2	3	13	14	7	Gnd
Error Amp		Feedback/PWM	Error Amp
	1	Comparator Input	2

This device contains 46 active transistors.

Description

The MC34060A is a fixed±frequency pulse width modulation control circuit, incorporating the primary building blocks required for the control of a switching power supply (see Figure 1). An internal±linear sawtooth oscillator is frequency±programmable by two external components, RT and CT. The approximate oscillator frequency is determined by:

fosc ^ 1.2 RT •CT

For more information refer to Figure 3.

Output pulse width modulation is accomplished by comparison of the positive sawtooth waveform across capacitor CT to either of two control signals. The output is enabled only during that portion of time when the sawtooth voltage is greater than the control signals. Therefore, an increase in control±signal amplitude causes a corresponding linear decrease of output pulse width. (Refer to the Timing Diagram shown in Figure 2.)

Figure 2. Timing Diagram

Capacitor CT

Feedback/P.W.M.

Comparator

Dead±Time Control

Output Q1,

Emitter

APPLICATIONS INFORMATION

The control signals are external inputs that can be fed into the dead±time control, the error amplifier inputs, or the feed±back input. The dead±time control comparator has an effective 120 mV input offset which limits the minimum output dead time to approximately the first 4% of the sawtooth±cycle time. This would result in a maximum duty cycle of 96%. Additional dead time may be imposed on the output by setting the dead time±control input to a fixed voltage, ranging between 0 V to 3.3 V.

The pulse width modulator comparator provides a means for the error amplifiers to adjust the output pulse width from the maximum percent on±time, established by the dead time control input, down to zero, as the voltage at the feedback pin

varies from 0.5 V to 3.5 V. Both error amplifiers have a common mode input range from ±0.3 V to (VCC ±2.0 V), and may be used to sense power supply output voltage and current. The error±amplifier outputs are active high and are ORed together at the noninverting input of the pulse±width modulator comparator. With this configuration, the amplifier that demands minimum output on time, dominates control of the loop.

The MC34060A has an internal 5.0 V reference capable of sourcing up to 10 mA of load currents for external bias circuits. The reference has an internal accuracy of ±5% with a typical thermal drift of less than 50 mV over an operating temperature range of 0° to +70°C.

MOTOROLA ANALOG IC DEVICE DATA	5