Panasonic AN8022SB, AN8022L Datasheet

Voltage Regulators

AN8022L, AN8022SB

AC-DC switching power supply control IC

■ Overview

The AN8022L and AN8022SB are ICs which are suitable for controlling a switching power supply using primary side control method.

Those are most suited for a switching power supply of relatively small capacity. Less frequently used functions are removed, and only the necessary minimum functions are incorporated, so that they are compact and very easy to use.

Moreover, the internal settings are incorporated as much as possible, thus cost down can be realized by decreasing the peripheral parts.

■ Features

•It operates at a control frequency up to 700 kHz, realizing the output rise time of 35 ns and the output fall time of 25 ns.

•Pre-start operating current is as small as 70 A (typical) so that it is possible to miniaturize the start resistor.

•Output block employs totem pole method.

The absolute maximum rating of ±1.0 A (peak) allows the direct drive of power MOSFET.

•Built-in pulse-by-pulse overcurrent protection circuit

•Built-in protection circuit against malfunction at low voltage (on/off: 14.2 V/9.2 V)

•Maximum Duty is 44% (typical)

•Equipped with timer latch function and overvoltage protection circuit.

•Two kinds of packages: 9-pin SIP, 16-pin SOP

■ Applications

• Various power supply equipment

AN8022L					Unit: mm
			9		0.4±0.25
			8
			7	0.5±0.1
21.7±0.3			6		1.2±0.25
			5
			4
			3
			2		2.54
			1
		1.0±0.25
				2.7±0.25
	4.3±0.3	0.3	+0.1		1.4±0.25
			–0.05
					1.35±0.25
	SIP009-P-0000D
AN8022SB					Unit: mm
6.50±0.30
16	9
		4.30±0.30		6.30±0.30	1.00±0.20
					05
					10
					..
					00
					+-
					15
					.
					0
1	8			1.50±0.20	0.50±0.05
(0.45) 0.80	0.35±0.10	0.65		0.10±0.10
					Seatng plane
	Seating plane
	SSOP016-P-0225B

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AN8022L, AN8022SB

Voltage Regulators

■ Block Diagram					CC
					(4)SV
TIM/OVP	8	OVP	Start/Stop		VREF	7	VCC
(5)				4.1 V		6	(3)PVCC
							VOUT
	3		FB	PWM		Drive 5	(2)
CT							GND
(13)	2	OSC	OCL				(1)PGND
RT							(16)SGND
(12)				Reset		4
					CLM		CLM(−)
			9	1			(15)
			IFB (6)	SS (11)

Note) The number in ( ) shows the pin number for the AN8022SB.

■ Pin Descriptions

• AN8022L

Pin No.	Symbol	Description
1	SS	Soft start pin
2	RT	Resistor connection pin that determines charge and discharge current of triangular wave
3	CT	Triangular wave generating capacitor connection pin
4	CLM(−)	Pulse-by-pulse overcurrent protection input pin
5	GND	Grounding pin
6	VOUT	Power MOSFET direct drive pin
7	VCC	Power supply voltage pin
8	TIM/OVP	Pin for overvoltage protection and timer latch (joint use)
9	IFB	Current feedback signal input pin from power-supply-output photocoupler

• AN8022SB

Pin No.	Symbol	Description	Pin No.	Symbol	Description
1	PGND	Grounding pin	10	N.C.	N.C.
2	VOUT	Power MOSFET direct drive pin	11	SS	Soft start pin
3	PVCC	Power supply voltage pin	12	RT	Charge and discharge current of
4	SVCC	Power supply voltage pin			triangular wave determining resistance
5	TIM/OVP	Pin for overvoltage protection and			connection pin
		timer latch combined use
			13	CT	Triangular wave generating capacitance
					connection pin
6	IFB	Power supply output photocoupler
		current feedback signal input pin
			14	N.C.	N.C.
7	N.C.	N.C.	15	CLM(−)	Pulse-by-pulse overcurrent protection
8	N.C.	N.C.			input pin
9	N.C.	N.C.	16	SGND	Grounding pin

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Voltage Regulators			AN8022L, AN8022SB
■ Absolute Maximum Ratings
Parameter		Symbol	Rating	Unit
Supply voltage		VCC	35	V
OVP terminal allowable application voltage		VOVP	VCC	V
CLM terminal allowable application voltage		VCLM	− 0.3 to +7.0	V
SS terminal allowable application voltage		VSS	− 0.3 to +7.0	V
Constant output current		IO	±150	mA
Peak output current		IOP	±1 000	mA
IFB terminal allowable application voltage		IFB	−5	mA
Power dissipation	AN8022L	PD	658	mW
	AN8022SB		340
Operating ambient temperature *		Topr	−30 to +85	°C
Storage temperature *		Tstg	−55 to +150	°C

Note) *: Expect for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.

■ Recommended Operating Range

Parameter	Symbol	Range	Unit
Timing resistor RT	R7	15 to 20	kΩ

■ Electrical Characteristics at Ta = 25°C

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Start voltage	VCC-START		13.0	14.2	15.4	V
Stop voltage	VCC-STOP		8.5	9.2	9.9	V
Standby bias current	ICC-STB	VCC = 12 V	50	70	105	µA
Operating bias current	ICC-OPR	VCC = 34 V	6.4	8.0	9.6	mA
OVP operating bias current 1	ICC-OVP1	VCC = 20 V	2.4	3.0	3.6	mA
OVP operating bias current 2	ICC-OVP2	VCC = 10 V	0.44	0.55	0.66	mA
OVP operating threshold voltage	VTH-OVP	VCC = 18 V	5.4	6.0	6.6	V
OVP release supply voltage	VCC-OVPC		7.6	8.4	9.2	V
Timer latch charge current	ICH-TIM	VCC = 18 V, RT = 19 kΩ	−20	−30	−40	µA
Timer latch start feedback current	IFB-TIM	VCC = 18 V	− 0.32	− 0.44	− 0.56	mA
Soft-start charge current	ICH-SS	VCC = 18 V, RT = 19 kΩ	−20	−30	−40	µA
Overcurrent protection threshold voltage 1	VTH-CLM1	VCC = 18 V	−180	−200	−220	mV
Pre-start low-level output voltage	VOL-STB	VCC = 12 V, IO = 10 mA		0.8	1.8	V
Low-level output voltage	VOL	VCC = 18 V, IO = 100 mA		1.3	1.8	V
High-level output voltage	VOH	VCC = 18 V, IO = −100 mA	15.0	16.5		V
Oscillation frequency 1	fOSC1	VCC = 18 V	175	200	225	kHz
Maximum duty 1	Dumax1	VCC = 18 V	40	44	48	%
Feedback current at 0% duty	IFB-Dumin	VCC = 18 V	− 0.9	−1.2	−1.5	mA
Feedback current at maximum duty	IFB-Dumax	VCC = 18 V	− 0.45	− 0.6	− 0.75	mA

3

AN8022L, AN8022SB

Voltage Regulators

■ Electrical Characteristics at Ta = 25°C (continued)

•Design reference data

Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Oscillation frequency 2	fOSC2	Ta = −30°C to +85°C	160		240	kHz
Overcurrent protection delay time	tDry-CLM	VCC = 18 V under no load		200		ns
Output voltage rise time	tr	VCC = 18 V under no load		35		ns
Output voltage fall time	tf	VCC = 18 V under no load		25		ns

■ Terminal Equivalent Circuits

Pin No.

Equivalent circuit

Description

I/O

1

SS:

(11)

Soft start terminal.

PWM

When VCC is applied, the capacitor connected to

comp.

this pin is charged, and the output duty is de-

500 Ω

creased by inputting the capacitor voltage to the

PWM.

1

(11)

2

VREF

RT:

(12)

The terminal for connecting a resistor to deter-

mine the charge and discharge current of the

500 Ω

triangular wave.

(12)

2

3

VREF

CT:

(13)

IO

The terminal for connecting a capacitor to gener-

(13)

ate the triangular wave.

3

2IO

PWM comp.

4

VREF

CLM(−):

I

(15)

The input terminal for pulse-by-pulse overcurrent

Reset

protection. It is usually required to attach an ex-

ternal filter.

	4	(15)
5		GND, (PGND), (SGND):
(1)(16)		Grounding terminal.
Note) The number in (	) is the pin number for the AN8022SB.

4

Voltage Regulators

AN8022L, AN8022SB

■ Terminal Equivalent Circuits (continued)

Pin No.

Equivalent circuit

Description

I/O

6

PVCC

VOUT:

O

(2)

The terminal for directly driving a power

6

MOSFET.

(2)

7

VCC , (PVCC), (SVCC):

(3)(4)

Supply voltage terminal.

It monitors the supply voltage and has operating

threshold value for start/stop/OVP reset.

8

TIM/OVP:

I

(5)

The terminal with double functions such as OVP

(overcurrent protection) and timer latch terminal.

[OVP]

When it receives the overvoltage signal of the

SVCC

power supply output and high is input to the

terminal, internal circuit is turned off. At the same

6 V

time, this condition (latch) is held. To reset

the

Comp.

OVP latch, it is necessary to reduce VCC under the

release voltage.

5 µA

500 Ω

[Timer latch]

The output voltage drop due to the overcurrent

8

(5)

condition of power supply output is detected

through the current level of IFB-input. When IFB

becomes less than a current of a certain value,

charge current flows into the capacitor connected

to this terminal. When the capacitor is charged to

the threshold voltage of OVP, OVP

starts to operate and the IC stays stop.

9

VREF

IFB:

I

(6)

The terminal into which the current feedback sig-

PWM

nal is input from the photocoupler of the power

supply output.

comp.

500 Ω

I/V

9

(6)

conversion

Note) The number in ( ) shows the pin number for the AN8022SB.

5