CURRENT MODE PWM CONTROLLER AP384XC
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Sep. 2006 Rev. 1. 1
General Description
The AP3842C/3C/4C/5C are high performance fixed frequency current-mode PWM controller ries. The integrated circuits are optimized for off-line and DC-DC converter applications with minimum external components. They feature under-voltage lockout (UVLO) circuit with low start-up current, trimmed oscillator for preci duty cycle control, current n comparator providing maximum current limiting and a totem pole output stage for increasing output current.In addition, the ICs also feature accurate protection against over-temperature, over-current and maximal output power.
The AP3842C and AP3844C have UVLO thresholds of 16V(on) and 10V(off); The corresponding thresh-olds for AP3843C and AP3845C are 8.4 V(on) and 7.6V(off).
The AP3842C and AP3843C can operate approaching 100% duty cycle; AP3844C and AP3845C can operate from zero to 50% duty cycle.
The ICs are available in SOIC-8 and DIP-8 pack-ages.
Features
·Low Start-up Current: 50µA
·Robust V REF Line/Load Regulation Low Line Regulation : 4mV Low Load Regulation : 4mV
·High Stability of Reference V oltage over a Full
Temperature Range: 0.2mV/ o C ·Operating Frequency up to 500KHz
·High PWM Frequency Stability over a Full Tem-perature Range: 2.5%
·High PWM Frequency Stability under a Full Sup-ply V oltage Range: 0.2%
·Accurate Over-temperature Protection with Hys-teresis
·UVLO with Hysteresis
Applications
·Off-line Converter ·DC-DC Converter ·V oltage Adapter
·CRT Monitor Power Supply ·
Desktop Power Supply ·
DVD/STB Power Supply
SOIC-8
DIP-8
Figure 1. Package Types of AP3842C/3C/4C/5C
CURRENT MODE PWM CONTROLLER AP384XC
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Sep. 2006 Rev. 1. 1
Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View)
Pin Configuration
Pin Description
Pin Number
Pin Name Function
1COMP This pin is the Error Amplifier output and is made available for loop compensation.2V FB The inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider.
3I SENSE A voltage proportional to inductor current is connected to this input. The PWM us this information to terminate the output switch conduction.
4
R
T /C T
The Oscillator frequency and maximum output duty cycle are programmed by con-necting resistor R T to V REF and capacitor C T to ground. Operation to 500 kHz is possi-ble.
5GND The combined control circuitry and power ground.
6OUTPUT This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced and sunk by this pin.7V CC The positive supply of the control IC.
8
V REF
This is the reference output. It provides charging current for capacitor C T through resistor R T .
P/M Package (DIP-8/SOIC-8)
COMP I SENSE V FB R T /C T
REF CC
CURRENT MODE PWM CONTROLLER AP384XC
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Sep. 2006 Rev. 1. 1
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3842C/3C/4C/5C
V CC GND
R T /C T
V FB I SENSE
COMP V REF
OUTPUT
CURRENT MODE PWM CONTROLLER AP384XC
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Sep. 2006 Rev. 1. 1
Package Tempera-ture Range Part Number
Marking ID
Packing Type Tin Lead Lead Free
Tin Lead Lead Free SOIC-8-40 to 85o C
AP3842/3/4/5CM AP3842/3/4/5CM-E13842/3/4/5CM 3842/3/4/5CM-E1Tube AP3842/3/4/5CMTR
AP3842/3/4/5CMTR-E13842/3/4/5CM
3842/3/4/5CM-E1Tape & Reel
DIP-8
-
40 to 85o C AP3842/3/4/5CP
AP3842/3/4/5CP-E1
AP3842/3/4/5CP
AP3842/3/4/5CP-E1
Tube
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Circuit Type Package P: DIP-8
M: SOIC-8E1: Lead Free Blank: Tin Lead AP384XC -
TR: Tape and Reel Blank: Tube
Ordering Information
CURRENT MODE PWM CONTROLLER AP384XC
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Sep. 2006 Rev. 1. 1
Parameter Symbol Value Unit Supply V oltage V CC 30
V Output Current I O ± 1
宁波市江东区
A Analog Inputs
V(ANA)-0.3 to 6.3
V Error Amp Output Sink Current I SINK (E.A)10mA Power Dissipation at T A < 25 o C (DIP-8)P D (
Note 3)1000mW Power Dissipation at T A <25 o C (SOIC-8)P D (Note 3)
460mW
Junction Operating Temperature
T J
-40 to 150o C Thermal Resistance (Junction to Ambient)DIP-8
R θJA 140o C/W SOIC-8
160o
关联商品C/W
Storage Temperature Range T STG -65 to 150o C Lead Temperature (Soldering, 10c)T LEAD +300o C
ESD (Machine Mode)
改造工程250
V
Note 1: Stress greater than tho listed under "Absolute Maximum Ratings" may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indi-cated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.
Note 2: All voltages are with respect to pin 5 and all currents are positive into specified terminal.Note 3: Board thickness 1.6mm, board dimension 90mm x 90mm.
出厂设置在哪里Parameter Symbol
Min Max Unit
Oscillation Frequency f 500
KHz
Ambient Temperature
T A
-40
85
o
C
Recommended Operating Conditions
Absolute Maximum Ratings (Note 1, 2)
CURRENT MODE PWM CONTROLLER AP384XC
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Sep. 2006 Rev. 1. 1
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
REFERENCE SECTION Reference Output V oltage V REF
T J =25o C, I REF =1mA 4.90 5.00
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5.10V Total Output Variation Line, Load, Temp. 4.82
5.18V Line Regulation ∆V REF 12V ≤ V CC ≤25V 415mV Load Regulation
∆V REF 1mA ≤ I REF ≤20mA 415mV Short Circuit Output Current I SC T A =25o C
-100-180mA Temperature Stability 0.20.4
mV/o C
OSCILLATOR SECTION Oscillation Frequency f T J =25o C
47
5257
KHz Oscillator Amplitude V OSC
Pin 4, peak to peak (Note 6) 1.7V Temperature Stability (Note 6)
斧正的意思
职业体验报告2.5%V oltage Stability 12V ≤ V CC ≤ 25V 0.21%Discharge Current
Vpin 4 =2V(Note 7)
8.59.5
10.5mA
ERROR AMPLIFIER SECTION Input V oltage V I Vpin 1=2.5V 2.45 2.50 2.55
V Output Sink Current I SINK Vpin1=1.1V 5 8 mA Output Source Current I SOURCE Vpin1=5V -0.5-0.8mA High Output V oltage V OH RL=15k Ω to GND 5
7V Low Output V oltage V OL
RL=15k Ω to pin 80.7 1.1V V oltage Gain
2V ≤ V O ≤ 4V 6590dB Power Supply Rejection Ratio PSRR 12V ≤ V CC ≤ 25V
驾驶6070
dB
CURRENT SENSE SECTION Maximum Input Signal V I (MAX)Vpin1=5V(Note 4)0.91 1.1V Gain
GV (Note 4, 5)
2.85
3 3.15
V/V Power Supply Rejection Ratio PSRR
12V ≤ V CC ≤ 25V (Note 4, 6)70dB Delay to Output Vpin3 = 0 to 2V (Note 6)
150300ns Input Bias Current I BIAS -3
-10µA
OUTPUT SECTION Low Output V oltage V OL I SINK = 20mA 0.10.4V I SINK = 200mA 1.4 2.2
V High Output V oltage V OH I SOURCE = 20mA 1314V I SOURCE = 200mA 12
13V Ri Time t R T J =25o C, C L =1nF (Note 6)50150ns Fall Time
t F
T J =25o C, C L =1nF (Note 6)
50
150ns
(V CC =15V , R T =10k Ω C T =3.3nF, T A = -40 to 85o C, unless otherwi specified.)
Electrical Characteristics
