Microsemi Corporation SG1825CJ, SG1825CJ-883B, SG1825CJ-DESC, SG1825CL, SG1825CL-883B Datasheet

		LIN D O C #: 1825
		SG1825C/SG2825C/SG3825C
		H I G H - S P E E D C U R R E N T - M O D E P W M
T H E I N F I N I T E P O W E R O F I N N O V A T I O N		N O T R E C O M M E N D E D F O R N E W D E S I G N S

D E S C R I P T I O N

The SG1825C is a high-performance pulse width modulator optimized for high frequency current-mode power supplies. Included in the controller are a precision voltage reference, micropower start-up circuitry, softstart, high-frequency oscillator, wideband error amplifier, fast currentlimit comparator, full double-pulse suppression logic, and dual totempole output drivers. Innovative circuit design and an advanced linear Schottky process result in very short propagation delays through the

current limit comparator, logic, and output drivers. This device can be used to implement either currentmode or voltage-mode switching power supplies. It also is useful as a series-resonant controller to frequencies beyond 1MHz. The SG1825C is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2825C is characterized for the industrial range of -25°C to 85°C, and the SG3825C is selected for the commercial range of 0°C to 70°C.

P R O D U C T H I G H L I G H T

I N I T I A L O S C I L L A T O R A C C U R A C Y

	15
														Sample Size = 45279
%														Mean 40111.661887
														Std. Dev. = 34.83
Units -
	10
of
Percentage	5

K E Y F E AT U R E S

■IMPROVED REFERENCE INITIAL TOLERANCE (±1% max.)

■IMPROVED OSCILLATOR INITIAL ACCURACY (±3% typ.)

■IMPROVED STARTUP CURRENT

(500µA typ.)

■PROP DELAY TO OUTPUTS (50ns typ.)

p10V TO 30V OPERATION

p5.1V REFERENCE TRIMMED TO ±1%

p2MHZ OSCILLATOR CAPABILITY

p1.5A PEAK TOTEM-POLE DRIVERS

pU.V. LOCKOUT WITH HYSTERESIS

pNO OUTPUT DRIVER "FLOAT"

pPROGRAMMABLE SOFTSTART

pDOUBLE-PULSE SUPPRESSION LOGIC

pWIDEBAND LOW-IMPEDANCE ERROR AMPLIFIER

pCURRENT-MODE OR VOLTAGE-MODE CONTROL

pWIDE CHOICE OF HIGH-FREQUENCY PACKAGES

HIGH RELIABILITY FEATURES

■AVAILABLE TO MIL-STD-883B

■LINFINITY LEVEL "S" PROCESSING AVAIL.

0

390

395

400

405

410

415

Initial Oscillator Accuracy - KHz

PA C K A G E O R D E R I N F O R M AT I O N

Plastic DIP

Plastic Wide SOIC

Plastic LCC

Ceramic DIP

Ceramic LCC

TJ (°C)

N

DW

Q

J

L

16-pin

16-pin

20-pin

16-pin

20-pin

0 to 70

SG3825CN

SG3825CDW

SG3825CQ

SG3825CJ

—

-25 to 85

SG2825CN

SG2825CDW

SG2825CQ

SG2825CJ

—

-55 to 125

—

—

—

SG1825CJ

SG1825CL

MIL-STD-883

—

—

—

SG1825CJ/883B

SG1825CL/883B

DESC

—

—

—

SG1825CJ/DESC

SG1825CL/DESC

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. SG3825CDWT)

F O R F U R T H E R I N F O R M A T I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

Copyright © 1994

1

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

Rev. 1.3 6/96

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

SG1825C/SG2825C/SG3825C

H I G H - S P E E D C U R R E N T - M O D E P W M

N O T R E C O M M E N D E D F O R N E W D E S I G N S

ABSOLUTE MAXIMUM RATINGS	(Note 1)
Input Voltage (VIN and VC) ..........................................................................................	30V
Analog Inputs:
Error Amplifier and Ramp ........................................................................	-0.3V to 7.0V
Softstart and ILIM/S.D. ................................................................................	-0.3V to 6.0V
Digital Input (Clock) ....................................................................................	1.5V to 6.0V
Driver Outputs ........................................................................................	-0.3V to VC+1.5V
Source / Sink Output Current (each output):
Continuous ..............................................................................................................	0.5A
Pulse, 500ns ............................................................................................................	2.0A
Softstart Sink Current................................................................................................	20mA
Clock Output Current .................................................................................................	5mA
Error Amplifier Output Current .................................................................................	5mA
Oscillator Charging Current .......................................................................................	5mA
Operating Junction Temperature:
Hermetic (J, L Package) .......................................................................................	150°C
Plastic (DW, N, Q Packages) ...............................................................................	150°C
Storage Temperature Range......................................................................	-65°C to 150°C
Lead Temperature (soldering, 10 seconds) ............................................................	300°C
Note 1. Exceeding these ratings could cause damage to the device.
THERMAL DATA
N PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	65°C/W
DW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	95°C/W
Q PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	80°C/W
J PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	80°C/W
L PACKAGE:
THERMAL RESISTANCE-JUNCTION TO CASE, θJC	35°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	120°C/W

Junction Temperature Calculation: TJ = TA + (PD x θJA).

The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.

PACKAGE PIN OUTS

INV. INPUT		1	16		VREF
N.I. INPUT		2	15		+VIN
E/A OUTPUT		3	14		OUTPUT B
CLOCK		4	13		VC
RT		5	12		PWR GND
CT		6	11		OUTPUT A
RAMP		7	10		GROUND
SOFTSTART		8	9		ILIM / S.D.

J & N PACKAGE

(Top View)

INV. INPUT	1	16	+VREF
N.I. INPUT	2	15	+VIN
E/A OUTPUT	3	14	OUTPUT B
CLOCK	4	13	VC
RT	5	12	PWR GND
CT	6	11	OUTPUT A
RAMP	7	10	GROUND
SOFTSTART	8	9	ILIM / S.D.

DW PACKAGE

(Top View)

3	2	1	20	19
4				18
5				17
6				16
7				15
8				14

910 11 12 13

Q PACKAGE

(Top View)

	3	2	1	20		19
	4						18
	5						17
	6						16
	7						15
	8						14
	9	10	11	12		13
	L PACKAGE
	(Top View)
1.	N.C.					11.	N.C.
2.	INV. INPUT					12.	ILIM / S.D.
3.	N.I. INPUT					13.	GROUND
4.	E/A OUTPUT					14. OUTPUT A
5. CLOCK						15. PWR GND
6.	N.C.					16.	N.C.
7. RT						17.	VC
8. CT						18. OUTPUT B
9.	RAMP					19.	+VIN
10. SOFTSTART						20.	VREF

2		Copyright © 1994
		Rev. 1.3 6/96

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

SG1825C/SG2825C/SG3825C

H I G H - S P E E D C U R R E N T - M O D E P W M

N O T R E C O M M E N D E D F O R N E W D E S I G N S

		R E C O M M E N D E D O P E R AT I N G			C O N D I T I O N S			(Note 2)
		Parameter		Symbol		Recommended Operating Conditions				Units
						Min.		Typ.	Max.
	Supply Voltage Range					10			30	V
	Voltage Amp Common Mode Range					1.5			5.5	V
	Ramp Input Voltage Range					0			5.0	V
	Current Limit / Shutdown Voltage Range					0			4.0	V
	Source / Sink Output Current
		Continuous						200		mA
		Pulse, 500ns						1.0		A
	Voltage Reference Output Current					1			10	mA
	Oscillator Frequency Range					4			1500	kHz
	Oscillator Charging Current					0.030			3	mA
	Oscillator Timing Resistor			RT		1			100	kΩ
	Oscillator Timing Capacitor			CT		0.470			10	nF
	Operating Ambient Temperature Range:
		SG1825C		TA		0			70	°C
		SG2825C		TA		-25			85	°C
		SG3825C		TA		-55			125	°C
	Note 2. Range over which the device is functional.
		E L E C T R I C A L	C H A R A C T E R I S T I C S (Note 3)

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG3825C with 0°C ≤ TA ≤ 70°C, SG2825C with -25°C ≤ TA ≤ 85°C, SG1825C with -55°C ≤ TA ≤ 125°C, and VIN=VC=15V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter		Symbol		Test Conditions	SG1825C/2825C			SG3825C			Units
					Min. Typ. Max. Min. Typ. Max.
Reference Section
Output Voltage			TJ = 25°C, IL = 1mA		5.05	5.10	5.15	5.05	5.10	5.15	V
Line Regulation			VIN = 10 to 30V			2	15		2	15	mV
Load Regulation			IL = 1 to 10mA			5	15		5	15	mV
Temperature Stability	(Note 3)		Over Operating Temperature			0.2	0.4		0.2	0.4	mV/°C
Total Output Range (Note 3)			Over Line, Load, and Temperature		5.00		5.20	5.00		5.20	V
Output Noise Voltage	(Note 3)		f = 10Hz to 10kHz, IL = 0mA			50	200		50		µVRMS
Long Term Stability (Notes 3 &4)			TJ = 125°C, t = 1000hrs			5	25		5	25	mV
Short Circuit Current			VREF = 0V		-15	-50	-100	-15	-50	-100	mA
Oscillator Section	(Note 5)
Initial Accuracy			TJ = 25°C, CCLK ≤ 10pF		370	400	430	370	400	430	kHz
Voltage Stability			VIN = 10 to 30V			0.2	2		0.2	2	%
Temperature Stability	(Note 3)		Over Rated Operating Temperature			5	8		5	8	%
Total Frequency Limits	(Note 3)		Over Line and Temperature		350		450	350		450	kHz
Minimum Frequency			RT = 100KΩ, CT = 0.01µF				4			4	kHz
Maximum Frequency			Ω	, CT = 470pF	1.5			1.5			MHz
			RT = 1K
Clock High Level			ICLK = -1mA		3.9	4.5		3.9	4.5		V
Clock Low Level			ICLK = -1mA			2.3	2.9		2.3	2.9	V
Ramp Peak Voltage					2.6	2.8	3.0	2.6	2.8	3.0	V
Ramp Valley Voltage					0.7	1.0	1.25	0.7	1.0	1.25	V
Valley-to-Peak Amplitude					1.6	1.8	2.0	1.6	1.8	2.0	V

Note 3. This parameter is guaranteed by design and process control, but is not 100% tested in production.

Note 4. This parameter is non-accumulative, and represents the random fluctuation of the reference voltage within some error band when observed over any 1000 hour period of time.

Copyright © 1994	3
Rev. 1.3 6/96