View AMS34063_165008.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Advanced Monolithic Systems
FEATURES
* Wide Input Voltage Operating Range from 2.5V to 40V * Low Standby Current * Current Limiting * Output Switch Current of 1.5A * Output Voltage Adjustable from 1.25 to 40V * Frequency of Operation to 100kHz
AMS34063
DC-TO-DC CONVERTER CONTROL CIRCUIT
APPLICATIONS
* Step-Up Converter * Step-Down Converter * Voltage Inverting Application
GENERAL DESCRIPTION
The AMS34063 series is a control circuit containing the basic functions required for DC-to-DC converters. The device consists of an internal temperature compensated reference, a comparator, a controlled duty cycle oscillator with an active current limit circuit, a driver and a high current output switch. Designed specifically to be incorporated in Step-Up, Step-Down and Voltage -Inverting applications, the AMS34063 requires a minimum number of external components. The AMS34063 is available in the 8-lead plastic SOIC and 8-lead plastic DIP packages.
ORDERING INFORMATION
PACKAGE TYPE 8 LEAD PDIP AMS34063P 8 LEAD SOIC AMS34063S OPER. TEMP RANGE -40C to +85C
PIN CONNECTIONS 8 LEAD SOIC/ 8 LEAD PDIP
SWITCH COLLECTOR SWITCH EMITTER TIMING CAPACITOR GND
1 2 3 4
8 7
DRIVER COLLECTOR IPK SENSE
6 VCC 5 COMPARATOR INVERTING INPUT
Top View
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Supply Voltage, VCC 40V Comparator Input Voltage Range, VIR -0.3V to +40V Switch Collector Voltage, VC(switch) 40V Switch Emitter Voltage, VE(switch) 40V Switch Collector to Emitter Voltage, VCE(switch) 40V Driver Collector Voltage, VC(driver) Switch Current, ISW Power Dissipation Maximum Junction Temperature Storage Temperature 40V 1.5A (Note 3) +125C -65C to +150C
ELECTRICAL CHARACTERISTICS
PARAMETER
Oscillator Charging Current Discharge Current Voltage Swing Discharge to Charge Current Ratio Current Limit Sense Voltage Output Switch (Note 2) Saturation Voltage, Darlington Connection Saturation Voltage DC Current Gain Collector Off-State Current Comparator Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Total Device 3.0V VCC 40V VIN = 0V
Electrical Characteristics at VCC = 5.0V, -40C TA +85C, unless otherwise noted. CONDITIONS Min.
5.0V VCC 40V, TA= 25C 5.0V VCC 40V, TA= 25C TA= 25C IPK(sense) = VCC, TA= 25C ICHG = IDISCHG, TA= 25C 250 20 150
AMS34063 Typ.
35 200 0.5 6.0 300
Units Max.
50 250 A A VP-P _ 350 mV
ISW = 1.0A, VC(driver) = VC(switch) ISW = 1.0A, IC(driver) = 50mA, (Forced 20) ISW = 1.0A, VCE = 5.0V, TA= 25C VCE = 40V, TA= 25C
1.0 0.45 35 10
1.3 0.7 120
V V
nA
1.18
1.25 0.04 40
1.32 0.2 400
V mV/V nA
5.0V VCC 40V, IPK(sense) = VCC , 2.4 3.5 mA CT = 0.001F, V pin 5 > Vth, Pin 2 = Gnd, Remaining pins open Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: To minimize power dissipation, low duty cycle pulse testing is used. Note 3: Power dissipation at TA = 25C is equal to 1.0W for the 8 lead P DIP package and 625mW for the SO-8 package. For operation at temperatures above TA = 25C derate the power dissipation at 10mW/C. Supply Current
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
FUNCTIONAL BLOCK DIAGRAM
DRIVE COLLECTOR 8 S R 170 IPK SENSE 7 IPK OSC VCC 6 + COMP. COMPARATOR INVERTING INPUT 5 1.25V REF REG 4 GND 2 SWITCH EMITTER Q Q2 Q1 1 SWITCH COLLECTOR
CT 3 TIMING CAPACITOR
TYPICAL PERFORMANCE CHARACTERISTICS
Output Switch On-Off Time vs Oscillator Timing Capacitor OUTPUT SWITCH ON-OFF TIME (s) 1000 SUPPLY CURRENT (mA)
VCC = 5.0V IPK(sense) = VCC Pin 5 = GND
Standby Supply Current vs Supply Voltage 3.2
CT= 0.001F IPK(sense) = VCC Pin 2 = GND
2.4
100
1.6
10
0.8
1.0
100 0.1 1.0 10 OSCILLATOR TIMING CAPACITOR
0
0
5.0 10 15 20 25 30 35 40 SUPPLY VOLTAGE (V)
Emitter-Follower Configuration Output Switch Saturation Voltage vs Emitter Current 1.6 SATURATION VOLTAGE (V) 1.5 1.4 1.3 1.2 1.1 1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 EMITTER CURRENT (A) SATURATION VOLTAGE (V)
VCC = 5.0V Pins 1,7,8 = VCC Pin 3,5 = GND
Common-Emitter Configuration Output Switch Saturation Voltage vs Collector Current 1.2 1.0 0.8 0.6 0.4 0.2 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 COLLECTOR CURRENT (A)
VCC = 5.0V Pin 7 = VCC Pin 2,3,5 = GND Darlington Connection
Forced Beta 20
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
TYPICAL APPLICATIONS
Step-Down Converter
8 S R Q Q2 Q1
1
7 IPK OSC 6 100 F + + COMP. 5 1.25V REF REG
2
RSC 0.33 VIN 25V
CT
1N5822 3 CT 470 pF 4 L 220H
R2 R1 1.2 k 3.6 k 470 F + CO
VOUT 5.0V/500mA
Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency
Conditions VIN = 15 to 25V, IO = 500mA VIN = 25V, IO = 50 to 500mA VIN = 25V, IO = 500mA VIN = 25V, RL = 0.1 VIN = 25V, IO = 500mA 15mV 5.0mV
Results
40 mVP-P 2.3A 84.7%
External Current Boost Connections for IC Peak Greater than 1.5A
a. External NPN Switch
b. External PNP Saturated Switch
8
1
8
1 VOUT
7 RSC VIN 6
2 VOUT RSC VIN
7
2
6
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
TYPICAL APPLICATIONS (Continued)
Step-Up Converter
170H L
8 180 S R Q Q2 Q1
1
7 IPK OSC 6 100 F + + COMP. 5 1.25V REF REG
2
RSC 0.22 VIN 12V
CT 3 CT 1500 pF 4
1N5819
R2 R1 2.2 k 47 k 150 F + CO
VOUT 28V/175mA
Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency
Conditions VIN = 8 to 16V, IO = 175 mA VIN = 12V, IO = 75 to 175 mA VIN = 12V, IO = 175 mA VIN = 12V, RL = 0.1 VIN = 12V, IO = 175 mA 12 mV 5.0 mV
Results
40 mVP-P 2.3A 84.7%
External Current Boost Connections for IC Peak Greater than 1.5A
a. External NPN Switch
b. External NPN Saturated Switch
18 0
8
1
VOUT
8 180
1
VOUT
7 RSC VIN 6
2 RSC VIN
7
2
6
R 0 for constant VIN
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
APPLICATION HINTS Design Formula Table
Calculation
tON tOFF
Step-Down
VOUT + VF VIN(MIN) - VSAT - VOUT 1 fMIN
Step-Up
VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 fMIN
(tON + tOFF) MAX CT IPK(switch) RSC L(MIN) CO
VSAT = Saturation voltage of the output switch. VF = Forward voltage drop of the ringback rectifier. Notes
4 x 10-5tON 2IOUT(MAX)
0.33/IPK(switch) VIN(MIN) - VSAT - VOUT tON(MAX ) IPK(switch) IPK(switch) (tON + tOFF) 8Vripple(P - P)
4 x 10-5tON
tON + tOFF 2IOUT ( MAX ) tOFF 0.33/IPK(switch) VIN(MIN) - VSAT tON(MAX ) IPK(switch) IOUT tON Vripple
The following power supply characteristics must be chosen: VIN - Nominal input voltage. If this voltage is not constant, then use VIN(MAX) for step-down and VIN(MIN) for step-up converter. R2 VOUT - Desired output voltage, VOUT = 1.25 1 + . R1 IOUT - Desired output current. fMIN - Minimum desired output switching frequency at the selected values for VIN and IO. Vripple(P-P) - Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor's equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation.
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
8 LEAD SOIC PLASTIC PACKAGE (S)
0.189-0.197* (4.801-5.004) 8 7 6 5
0.228-0.244 (5.791-6.197)
0.150-0.157** (3.810-3.988)
1
2
3
4
0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.008-0.010 (0.203-0.254)
0.010-0.020 x 45 (0.254-0.508) 0-8 TYP
0.014-0.019 (0.355-0.483)
0.050 (1.270) TYP
0.016-0.050 (0.406-1.270)
S (SO-8 ) AMS DRW# 042293
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
8 LEAD PLASTIC DIP PACKAGE (P)
0.400* (10.160) MAX 8 7 6 5
0.2550.015* (6.4770.381)
1
2
3
4
0.045-0.065 (1.143-1.651)
0.1300.005 (3.3020.127)
0.300-0.325 (7.620-8.255)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.1000.010 (2.5400.254) 0.125 (3.175) MIN 0.0180.003 (0.4570.076) 0.015 (0.380) MIN
0.009-0.015 (0.229-0.381) 0.325 +0.025 -0.015 (8.255 +0.635 -0.381
)
P (8L PDIP ) AMS DRW# 042294
*DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTUSIONS. MOLD FLASH OR PROTUSIONS SHALL NOT EXCEED 0.010" (0.254mm)
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

▲Up To Search▲

Price & Availability of AMS34063

	To Download AMS34063 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .