Motorola MC34025DW, MC34025DWR2, MC34025P, MC33025DW, MC33025DWR2 Datasheet

High Speed Double-Ended

PWM Controller

The MC34025 series are high speed, fixed frequency, double±ended pulse width modulator controllers optimized for high frequency operation. They are specifically designed for Off±Line and DC±to±DC converter applications offering the designer a cost effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high speed current sensing comparator, steering flip±flop, and dual high current totem pole outputs ideally suited for driving power MOSFETs.

Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle±by±cycle current limiting, and a latch for single pulse metering.

The flexibility of this series allows it to be easily configured for either current mode or voltage mode control.

•50 ns Propagation Delay to Outputs

•Dual High Current Totem Pole Outputs

•Wide Bandwidth Error Amplifier

•Fully±Latched Logic with Double Pulse Suppression

•Latching PWM for Cycle±By±Cycle Current Limiting

•Soft±Start Control with Latched Overcurrent Reset

•Input Undervoltage Lockout with Hysteresis

•Low Start±Up Current (500 μA Typ)

•Internally Trimmed Reference with Undervoltage Lockout

•90% Maximum Duty Cycle (Externally Adjustable)

•Precision Trimmed Oscillator

•Voltage or Current Mode Operation to 1.0 MHz

•Functionally Similar to the UC3825

			Simplified	Application
	Vref	16		5.1V	15
		4		Reference	VCC
	Clock
	RT	5		UVLO
			Oscillator		13
	CT
		6			VC
					14
		7
	Ramp				Output B
		3		Latching
	Error Amp			PWM and
	Output		Error	Steering	11
	Noninverting	2		Flip Flop
			Amp
	Input				Output A
					Power
	Inverting
	Input	1			12 Ground
		8			9
	Soft±Start		Soft±Star		Current
			t		Limit/
					Shutdown
				10 Ground

This device contains 227 active transistors.

Order this document by MC34025/D

MC34025

MC33025

16

1

P SUFFIX

PLASTIC PACKAGE

CASE 648

16

1

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

(SO±16L)

PIN CONNECTIONS

Error Amp
Inverting Input	1					16	V
Error Amp							ref
	2					15	V
Noninverting Input							CC
Error Amp Output	3					14	Output B
Clock	4					13	V
							C
R	5					12	Power Ground
T
CT	6					11	Output A
Ramp	7					10	Ground
							Current Limit/
Soft±Start	8					9
							Shutdown
		(Top View)

ORDERING INFORMATION

		Operating
	Device	Temperature Range	Package
	MC33025DW	TA = ± 40° to +105°C	SO±16L
	MC33025P		Plastic DIP
	MC34025DW	TA = 0° to +70°C	SO±16L
	MC34025P		Plastic DIP

Motorola, Inc. 1996

Rev 1

MC34025 MC33025

MAXIMUM RATINGS

Rating	Symbol	Value	Unit
Power Supply Voltage	VCC	30	V
Output Driver Supply Voltage	VC	20	V
Output Current, Source or Sink (Note 1)	IO		A
DC		0.5
Pulsed (0.5 μs)		2.0
Current Sense, Soft±Start, Ramp, and Error Amp Inputs	Vin	± 0.3 to +7.0	V
Error Amp Output and Soft±Start Sink Current	IO	10	mA
Clock and RT Output Current	ICO	5.0	mA
Power Dissipation and Thermal Characteristics
SO±16 Package (Case 751G)
Maximum Power Dissipation @ TA = + 25°C	PD	862	mW
Thermal Resistance, Junction±to±Air	RθJA	145	°C/W
DIP Package (Case 648)
Maximum Power Dissipation @ TA = + 25°C	PD	1.25	W
Thermal Resistance, Junction±to±Air	RθJA	100	°C/W
Operating Junction Temperature	TJ	+150	°C
Operating Ambient Temperature (Note 2)			°C
MC34025	TA	0 to +70
MC33025		± 40 to +105
Storage Temperature Range	Tstg	± 55 to +150	°C

ELECTRICAL CHARACTERISTICS (VCC = 15 V, RT = 3.65 kΩ, CT = 1.0 nF, for typical values TA = + 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 2], unless otherwise noted.)

Characteristic		Symbol		Min	Typ	Max	Unit
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = + 25°C)		Vref		5.05	5.1	5.15	V
Line Regulation (VCC = 10 V to 30 V)		Regline		±	2.0	15	mV
Load Regulation (IO = 1.0 mA to 10 mA)		Regload		±	2.0	15	mV
Temperature Stability		TS		±	0.2	±	mV/°C
Total Output Variation over Line, Load, and Temperature		Vref		4.95	±	5.25	V
Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = + 25°C)		Vn		±	50	±	μV
Long Term Stability (TA = +125°C for 1000 Hours)		S		±	5.0	±	mV
Output Short Circuit Current		ISC		±30	±65	±100	mA
OSCILLATOR SECTION
Frequency							kHz
TJ = + 25°C		fosc		380	400	420
Line (VCC = 10 V to 30 V) and Temperature (TA = Tlow to Thigh)				370	400	430
Frequency Change with Voltage (VCC = 10 V to 30 V)		fosc/	V	±	0.2	1.0	%
Frequency Change with Temperature (TA = Tlow to Thigh)		fosc/	T	±	2.0	±	%
Sawtooth Peak Voltage		VP		2.6	2.8	3.0	V
Sawtooth Valley Voltage		VV		0.7	1.0	1.25	V
Clock Output Voltage							V
High State		VOH		3.9	4.5	±
Low State		VOL		±	2.3	2.9
NOTES: 1. Maximum package power dissipation limits must be observed.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for MC34025	Thigh = +70°C for MC34025
= ± 40°C for MC33025	= +105°C for MC33025

2	MOTOROLA ANALOG IC DEVICE DATA

MC34025 MC33025

ELECTRICAL CHARACTERISTICS (VCC = 15 V, RT = 3.65 kΩ, CT = 1.0 nF, for typical values TA = + 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 2], unless otherwise noted.)

	Characteristic		Symbol	Min	Typ	Max	Unit
ERROR AMPLIFIER SECTION
Input Offset Voltage			VIO	±	±	15	mV
Input Bias Current			IIB	±	0.6	3.0	μA
Input Offset Current			IIO	±	0.1	1.0	μA
Open±Loop Voltage Gain (VO = 1.0 V to 4.0 V)			AVOL	60	95	±	dB
Gain Bandwidth Product (TJ = + 25°C)			GBW	4.0	8.3	±	MHz
Common Mode Rejection Ratio (VCM = 1.5 V to 5.5 V)			CMRR	75	95	±	dB
Power Supply Rejection Ratio (VCC = 10 V to 30 V)			PSRR	85	110	±	dB
Output Current, Source (VO = 4.0 V)			ISource	0.5	3.0	±	mA
	Sink (VO = 1.0 V)		ISink	1.0	3.6	±
Output Voltage Swing, High State (IO = ± 0.5 mA)			VOH	4.5	4.75	5.0	V
	Low State (IO = 1.0 mA)		VOL	0	0.4	1.0
Slew Rate			SR	6.0	12	±	V/μs
PWM COMPARATOR SECTION
Ramp Input Bias Current			IIB	±	± 0.5	± 5.0	μA
Duty Cycle, Maximum			DC(max)	80	90	±	%
Minimum			DC(min)	±	±	0
Zero Duty Cycle Threshold Voltage Pin 3(4) (Pin 7(9) = 0 V)			Vth	1.1	1.25	1.4	V
Propagation Delay (Ramp Input to Output, TJ = + 25°C)			tPLH(in/out)	±	60	100	ns
SIFT±START SECTION
Charge Current (VSoft±Start = 0.5 V)			Ichg	3.0	9.0	20	μA
Discharge Current (VSoft±Start = 1.5 V)			Idischg	1.0	4.0	±	mA
CURRENT SENSE SECTION
Input Bias Current (Pin 9(12) = 0 V to 4.0 V)			IIB	±	±	15	μA
Current Limit Comparator Threshold			Vth	0.9	1.0	1.10	V
Shutdown Comparator Threshold			Vth	1.25	1.40	1.55
Propagation Delay (Current Limit/Shutdown to Output, TJ = + 25°C)			tPLH(in/out)	±	50	80	ns
OUTPUT SECTION
Output Voltage							V
Low State	(ISink = 20 mA)		VOL	±	0.25	0.4
	(ISink = 200 mA)			±	1.2	2.2
High State	(ISource = 20 mA)		VOH	13	13.5	±
	(ISource = 200 mA)			12	13	±
Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 0.5 mA)			VOL(UVLO)	±	0.25	1.0	V
Output Leakage Current (VC = 20 V)			IL	±	100	500	μA
Output Voltage Rise Time (CL = 1.0 nF, TJ = + 25°C)			tr	±	30	60	ns
Output Voltage Fall Time (CL = 1.0 nF, TJ = + 25°C)			tf	±	30	60	ns
UNDERVOLTAGE LOCKOUT SECTION
Start±Up Threshold (VCC Increasing)			Vth(on)	8.8	9.2	9.6	V
UVLO Hysteresis Voltage (VCC Decreasing After Turn±On)			VH	0.4	0.8	1.2	V
TOTAL DEVICE
Power Supply Current			ICC				mA
Start±Up (VCC = 8.0 V)				±	0.5	1.2
Operating				±	25	35
NOTES: 1. Maximum package power dissipation limits must be observed.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for MC34025		Thigh = +70°C for MC34025
= ± 40°C for MC33025		= +105°C for MC33025

MOTOROLA ANALOG IC DEVICE DATA	3

MC34025 MC33025

Figure 1. Timing Resistor versus

Oscillator Frequency

	100 k						VCC = 15 V
		1	3	5	7	9
							TA	= + 25°C
(Ω)			2	4	6	8
RESISTOR		CT=
	10 k 1. 100 nF
		2. 47 nF
		3. 22 nF
, TIMING
		4. 10 nF
		5. 4.7 nF
		6. 2.2 nF
T
		7. 1.0 nF
R	1.0 k
		8. 470 pF
	470	9. 220 pF
					104	105	106	107
	100		1000

fosc, OSCILLATOR FREQUENCY (Hz)

Figure 2. Oscillator Frequency versus Temperature

(kHz)	1200						RT = 1.2 k
					1.0 MHz
	1000						CT = 1.0 nF
FREQUENCY
	800
	600	VCC = 15 V
, OSCILLATOR							RT = 3.6 k
					400 kHz
	400						CT = 1.0 nF
	200						RT = 36 k
osc
						50 kHz	C = 1.0 nF
f							T
	0	± 25	0	25	50	75	100	125
	± 55
			TA, AMBIENT TEMPERATURE (°C)

Figure 3. Error Amp Open Loop Gain and	Figure 4. PWM Comparator Zero Duty Cycle
Phase versus Frequency	Threshold Voltage versus Temperature

(dB)	120						0			1.3
	100
,OPEN LOOP VOLTAGE GAIN									(V)	1.28
								°θ,EXCESSPHASE(C)
											VCC = 15 V
	80						45		CYCLE
				Gain						1.26	Pin 7(9) = 0 V
	60
									DUTY
		Phase
	40						90			1.24
									ZERO
	20
									,
	0								th	1.22
VOL							135		V
A	± 20									1.2
		100	1.0 k	10 k	100 k	1.0 M	10 M				±25	0	25	50	75	100	125
	10									±55
			f, FREQUENCY (Hz)									TA, AMBIENT TEMPERATURE (°C)

	Figure 5. Error Amp Small Signal	Figure 6. Error Amp Large Signal
	Transient Response	Transient Response
2.55	V	3.0 V
2.5	V	2.5 V
2.45	V	2.0 V
	0.1 μs/DIV	0.1 μs/DIV

4	MOTOROLA ANALOG IC DEVICE DATA

MC34025 MC33025

Figure 7. Reference Voltage Change

versus Source Current

(mV)	0
CHANGE	±5.0
	±10	VCC = 15 V	TA = ± 55°C
VOLTAGE					TA = + 25°C
	±15		TA = +125°C
, REFERENCE	±20
	±25
ref
V	±30
		10	20	30	40	50
	0
			ISource, SOURCE CURRENT (mA)

I SC, REFERENCE SHORT CIRCUIT CURRENT (mA)

Figure 8. Reference Short Circuit Current versus Temperature

66

VCC = 15 V

65.6

65.2

64.8

64.4

64

±55	± 25	0	25	50	75	100	125
		TA, AMBIENT TEMPERATURE (°C)

Figure 9. Reference Line Regulation

Figure 10. Reference Load Regulation

2.0 mV/DIV

2.0 mV/DIV

Vref LINE REGULATION 10 V ± 24 V	Vref LINE REGULATION 1.0 mA ± 10 mA
2.0 ms/DIV	2.0 ms/DIV

Vth(CL), CURRENT LIMIT THRESHOLD CHANGE (mV)

Figure 11. Current Limit Comparator Threshold Change versus Temperature

4.0

2.0

0

± 2.0
± 4.0
± 6.0
± 8.0
±10
±12
± 50	± 25	0	25	50	75	100	125
		TA, AMBIENT TEMPERATURE (°C)

Vth , SHUTDOWN THRESHOLD VOLTAGE (V)

Figure 12. Shutdown Comparator Threshold Voltage versus Temperature

1.50

1.46 VCC = 15 V

1.42

1.38

1.34

1.30
±55	±25	0	25	50	75	100	125

TA, AMBIENT TEMPERATURE (°C)

MOTOROLA ANALOG IC DEVICE DATA	5

MC34025 MC33025

I chg , SOFT-START CHARGE CURRENT (μ A)

Figure 13. Soft±Start Charge Current	Figure 14. Output Saturation Voltage
versus Temperature	versus Load Current

10							(V)	0			Source Saturation
									80 μs Pulsed Load
V		= 15 V					VOLTAGE				(Load to Ground)
9.5	CC							±1.0
									VCC = 15 V
9.0							SATURATION	2.0	120 Hz Rate
								±2.0
8.5									TA = + 25°C
8.0							OUTPUT,
7.5								1.0				Sink Saturation
							sat				Ground	(Load to V	)
7.0							V	0					CC
±55	±25	0	25	50	75	100	125	0	0.2	0.4	0.6	0.8	1.0
		TA, AMBIENT TEMPERATURE (°C)								IO, OUTPUT LOAD CURRENT (A)

Figure 15. Drive Output Rise and Fall Time

Figure 16. Drive Output Rise and Fall Time

OUTPUT RISE & FALL TIME 1.0 nF LOAD	OUTPUT RISE & FALL TIME 10.0 nF LOAD
50 ns/DIV	50 ns/DIV

Figure 17. Supply Voltage versus Supply Current

	30
(mA)	25	RT = 3.65 kΩ
		CT = 1.0 nF
CURRENT	20
	15			VCC Increasing
, SUPPLY	10	VCC Decreasing
CC	5.0
I
	0
	0	4.0	8.0	12	16	20
			VCC, SUPPLY VOLTAGE (V)

6	MOTOROLA ANALOG IC DEVICE DATA