CMOS Current-Mode PWM Voltage Controller
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Features
General Description
The APW38HC4XA family are fixed frequency, high
performance, current-mode PWM controller with 1.2
A drive current capability. Undervoltage lockout cir-
cuitry allows the APW38HC42A and APW38HC44A
versions to start up at 14.5V and operate down to
9V, and the APW38HC43A and APW38HC45A ver-
sions start at 8.4V with operateion down to 7.6V. All
versions operate up to 24V. The ultra low start-up
current 25
µ
A (typical), and operating current 2mA
(typical) have been designed to improve the converter
efficiency. High output driving capability up to 1.2A
ensures the fast switching to minimize the switching
losses. The APW38HC4XA features a trimmed and
temperature compensated oscillator discharge cur-
rent and bandgap reference. APW38HC4XA is avail-
able in both 8-pin plastic DIP and SOP packages.
Applications
•
Current-mode , Off-line , Switched-mode Power
Supplies
•
Current-mode , DC-to-DC converters
•
Various converters ( step-down, step-up, flyback
, forward, and synchronous FET)
Ordering and Marking Information
•
Ultralow start-up current (25
µ
A typical)
•
Low operating current (2mA typical)
•
Fast output rise/fall times :
−
15ns rise/10ns fall
•
High output drive (1.2A peak current)
•
CMOS outputs with rail-to-rail swing
•
Current-mode operation up to 1MHz
•
Trimmed 5V bandgap reference
•
Pin-to-pin compatible with MIC38HC4X
•
Trimmed oscillator discharge current
•
UVLO with hysteresis
•
Low cross-conduction currents
APW38HC4XA
Package Code
J : DIP - 8 K : SOP-8
Temp. Range
C : 0 to 70 C I : -40 to 85 C
Handling Code
TU : Tube TR : Tape & Reel
°
Handling Code
Temp. Range
Package Code
°
X - 2/3/4/5 XXXXX - Date Code
APW38HC4XA
XXXXX
APW384XA J :
APW38HC4XA
XXXXX
APW384XA K :
X - 2/3/4/5 XXXXX - Date Code
Pin Description
ISNS
RT/CT
VDD
GND
COMP
FB
OUT
1
2
3
4
VREF
5
6
7
8
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
2
Duty Cycle
Startup 8.4V
Minimum Operating 7.6V
Startup 14.5V
Minimum Operating 9V
0~96%
APW38HC43A
APW38HC42A
0~50%
APW38HC45A
APW38HC44A
Block Diagram
Functional Pin Description
Pin Name
Pin Number
Function Description
1
COMP
Compensation: Connect external compensation network to
modify the error amplifier output.
2
FB
Feedback (Input): Error amplifier input. Feedback is 2.5V at
desired output voltage.
3
ISNS
Current Sense (Input): Current sense comparator input.
Connect to current sensing resistor or current transformer.
4
RT/CT
Timing Resistor/Timing Capacitor: Connect external RC
network to select switching frequency.
5
GND
Ground: Combined analog and power ground.
6
OUT
Power Output: Totem-pole output.
7
VDD
Analog Supply (Input): Controller circuitry supply input. Return
to analog ground (AGND).
8
VREF
5V Reference (Output): Connect external RC network.
UVLO
T Q
Oscillator
5V
Reference
S
Q
R
+
-
+
-
OUT
ISNS
GND
COMP
2.5V
FB
RT/CT
VREF
VDD
R
2R
E. A.
Selection Guide
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
3
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V
DD
Supply Voltage
24
V
V
ISNS
Current Sense Voltage
-0.3 to 5.5
V
V
FB
Feedback Voltage
-0.3 to 5.5
V
T
J
Junction Temperature Range
300
°
C
T
STG
Storage Temperature
-65 to 150
°
C
T
SDR
Soldering Temperature
300,10 Seconds
°
C
V
ESD
Minimum ESD Rating
±3
kV
Thermal Characteristics
Symbol
Parameter
Value
Unit
θ
JA
Thermal Resistance in Free Air
DIP
SOP
125
175
°
C/W
V
DD
=15V, Note3 ; RT=9.09K
Ω
; CT=3.3nF; -40
o
C
≤
T
A
≤
85
o
C; unless noted
APW38HC4XA
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
REFERENCE VOLTAGE
V
REF
Reference Voltage
T
A
=25
°
C, I
O
(Output Current)=1mA 4.90
5.00
5.10
V
REG
line
Line Regulation
12V
≤
V
DD
≤
18V, I
O
=5
µ
A
1
20
mV
REG
load
Load Regulation
1mA
≤
I
O
≤
20mA
6
25
mV
Temp. Stability
0.2
mV/
°
C
Total Output Variation
Line, Load, Temp.
4.82
5.18
V
Output Noise Voltage
10Hz
≤
f
≤
10kHz, T
A
= 25
o
C
50
µ
V
Long Term Stability
T
A
= 125
o
C, 1000 hrs
5
25
mV
I
SC
Output Short Circuit
-25
-55
-120
mA
OSCILLATOR
F
OSC
Initial Accuracy
T
A
=25
°
C, Note 4
49
52
55
kHz
Voltage Stability
12V
≤
V
DD
≤
18V
0.2
1.0
%
Temp. Stability
T
MIN
≤
T
A
≤
T
MAX
0.03
%/
°
C
T
A
=25
°
C, V
RT/CT
=2V
7.7
8.4
9.0
I
DISCHG
Clock Ramp Reset
Current
T
A
=T
MIN
to T
MAX
7.2
8.4
9.5
mA
V
OSC
Amplitude
V
RT/CT
peak to peak
1.6
V
P-P
ERROR AMPLIFIER
Input Voltage
V
COMP
=2.5V
2.42
2.50
2.58
V
Electrical Characteristics
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
4
V
DD
=15V, Note3 ; RT=9.09K
Ω
; CT=3.3nF; -40
o
C
≤
T
A
≤
85
o
C; unless noted
APW38HC4XA
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
ERROR AMPLIFIER
I
FB
Input Bias Current
V
FB
=5V
0.1
µ
A
A
VOL
Open Loop Gain
2
≤
V
O
≤
4V
60
70
dB
BW
Unity Gain Bandwidth
0.7
1.0
MHz
PSRR
12
≤
V
DD
≤
18V
60
dB
Output Sink Current
V
FB
=2.7V, V
COMP
=1.1V
2
7
mA
Output Source Current
V
FB
=2.3V, V
COMP
=5V
-0.5
-1
mA
V
OH
Output Voltage (High)
V
FB
=2.3V, R
L
=15k to GND
5
5.4
V
V
OL
Output Voltage (Low)
V
FB
=2.7V, R
L
=15k to VREF
0.01
1.1
V
CURRENT SENSE
A
Gain
Notes 1,2
2.85
3.0
3.15
V/V
V
THM
Maximum Threshold
V
COMP
=5V, Note 1
0.9
1.0
1.1
V
PSRR
12
≤
V
DD
≤
18V, Note 1
70
dB
I
ISNS
Input Bias Current
V
ISNS
=5V
0.1
µ
A
T
D
Delay to Output
120
250
ns
OUTPUT
R
DS(ON)
High
Sourcing Current = 200mA
6.3
R
DS(ON)
Low
Sinking Current = 200mA
4
Ω
t
R
Rise Time
T
A
=25
°
C, C
L
=1nF
15
30
ns
t
F
Fall Time
T
A
=25
°
C, C
L
=1nF
10
20
ns
UNDERVOLTAGE LOCKOUT
APW38HC42/4A 13.5
14.5
15.5
V
DD(ST)
Start Threshold
APW38HC43/5A
7.8
8.4
9.0
V
APW38HC42/4A
8.0
9.0
10.0
V
DD(MIN)
Minimum Operating Voltage
APW38HC43/5A
7.0
7.6
8.2
V
PULSE WIDTH MODULATOR
APW38HC42/3A
94
96
D
MAX
Maximum Duty Cycle
APW38HC44/5A
46
50
%
D
MIN
Minimum Duty Cycle
0
%
TOTAL STANDBY CURRENT
V
DD
=13V, APW38HC42/4A
30
150
I
DD(ST)
Start-Up Current
V
DD
=7.5V, APW38HC43/5A
25
150
µ
A
I
DD(OP)
Operating Supply Current
V
FB
=V
ISNS
= 0V, C
L
=1nF
2.0
4.0
mA
Electrical Characteristics (Cont.)
Note 1 : Parameter measured at trip point of latch with V
FB
=0V.
Note 2 : Gain defined as :
A = , 0<V
TH(ISNS)
<0.8V
Note 3 : Adjust V
DD
above the start threshold before setting at 15V.
Note 4 : Output frequency equals oscillator frequency for the APW38HC42A and APW38HC43A. Output
frequency for APW38HC44A and APW38HC45A equals one half of the oscillator frequency.
∆
V
COMP
∆
V
TH(ISNS)
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
5
1
10
100
10
100
1000
200pF
470pF
1nF
10nF
4.7nF
1.8nF
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0
1
2
3
4
5
6
7
125
o
C
25
o
C
-50
o
C
7.0
7.2
7.4
7.6
7.8
8.0
8.2
8.4
8.6
8.8
9.0
-60
-30
0
30
60
90
120
150
1
10
100
10
100
1000
20
0pF
47
0pF
1nF
1.
8nF
4.
7nF
10
nF
Typical Characteristics
Oscillator Frequency (kHz)
RT Resistance (k
Ω
)
Oscillator Frequency Configuration
Output Dead Time vs. Oscillator Frequency
Oscillator Frequency (kHz)
Output Dead Time ( %)
Oscillator Discharge Current vs.
Temperature
Temperature (
°
C)
Oscillator Discharge Current (mA)
Current Sense Amplifier Threshold vs.
Error Amplifier Output
Error Amplifier Output (V)
Current Sense AMP Threshold (V)
V
DD
= 15V
V
RTCT
= 2V
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
6
-10
-5
0
5
10
15
20
25
30
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0
10
20
30
40
50
60
70
80
90
100
-60
-30
0
30
60
90
120
150
Typical Characteristics (Cont.)
Short-Circuit Current of V
REF
vs.
Temperature
V
REF
Short-Circuit Current (mA)
Temperature (
°
C)
Output Waveform
Output Voltage (V)
Time (
µ
s)
Open Loop test Circuit
CO M P
VFB
ISENSE
RT/C T
REF
Vcc
O UTPUT
G ND
APW 38HC42A/3A/4A/5A
A
REF
Vcc
O utput
G ND
C
T
5K
Ω
I
S E NS E
Adjust
100K
Ω
2N2222
R
T
4.7K
Ω
1K
Ω
Error Am p
Adjust
4.7K
Ω
1K
Ω ,
1W
0.1
µ
F
0.1
µ
F
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
7
PDIP-8 pin ( Reference JEDEC Registration MS-001)
Packaging Information
1
D
E1
A2
A1
A
L
e2
e 3
e 1
E
E3
1
Millimeters
Inches
Dim
Min.
Max.
Min.
Max.
A
5.33
0.210
A1
0.38
0.015
A2
2.92
3.68
0.115
0.145
L
9.02
10.16
0.355
0.400
e1
2.54BSC
0.100BSC
e2
0.36
0.56
0.014
0.022
e3
1.14
1.78
0.045
0.070
E
7.62 BSC
8.26
0.300 BSC
0.325
E1
6.10
7.11
0.240
0.280
E3
10.92
0.430
L
2.92
3.81
0.115
0.150
∅
1
0
°
15
°
0
°
15
°
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
8
Package Information
H
E
e1
e2
D
A
A1
0.004max.
1
L
e
0.015X45
°°°°
SOP- 8 pin ( Reference JEDEC Registration MS-012)
Millimeters
Inches
Dim
Min .
Max.
Min .
Max.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.004
0.010
D
4.80
5.00
0.189
0.197
E
3.80
4.00
0.150
0.157
H
5.80
6.20
0.228
0.244
L
0.40
1.27
0.016
0.050
e1
0.33
0.51
0.013
0.020
e2
1.27BSC
0.50BSC
∅
1
8
°
8
°
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
9
Reference JEDEC Standard J-STD-020A APRIL 1999
Reflow Condition
(IR/Convection or VPR Reflow)
Physical Specifications
Pre-heat temperature
183 C
Peak temperature
Time
°
temperature
Classification Reflow Profiles
Convection or IR/
Convection
VPR
Average ramp-up rate(183
°
C to Peak)
3
°
C/second max.
10
°
C /second max.
Preheat temperature 125 ± 25
°
C)
120 seconds max
Temperature maintained above 183
°
C
60 – 150 seconds
Time within 5
°
C of actual peak temperature 10 –20 seconds
60 seconds
Peak temperature range
220 +5/-0
°
C or 235 +5/-0
°
C 215-219
°
C or 235 +5/-0
°
C
Ramp-down rate
6
°
C /second max.
10
°
C /second max.
Time 25
°
C to peak temperature
6 minutes max.
Package Reflow Conditions
pkg. thickness
≥≥≥≥
2.5mm
and all bgas
pkg. thickness < 2.5mm and
pkg. volume
≥≥≥≥
350 mm³
pkg. thickness < 2.5mm and pkg.
volume < 350mm³
Convection 220 +5/-0
°
C
Convection 235 +5/-0
°
C
VPR 215-219
°
C
VPR 235 +5/-0
°
C
IR/Convection 220 +5/-0
°
C
IR/Convection 235 +5/-0
°
C
Terminal Material
Solder-Plated Copper (Solder Material : 90/10 or 63/37 SnPb)
Lead Solderability
Meets EIA Specification RSI86-91, ANSI/J-STD-002 Category 3.
Copyright
ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
APW38HC42A/3A/4A/5A
www.anpec.com.tw
10
Reliability test program
Test item
Method
Description
SOLDERABILITY
MIL-STD-883D-2003
245
°
C , 5 SEC
HOLT
MIL-STD-883D-1005.7
1000 Hrs Bias @ 125
°
C
PCT
JESD-22-B, A102
168 Hrs, 100 % RH , 121
°
C
TST
MIL-STD-883D-1011.9
-65
°
C ~ 150
°
C, 200 Cycles
ESD
MIL-STD-883D-3015.7
VHBM > 2KV, VMM > 200V
Latch-Up
JESD 78
10ms , I
tr
> 100mA
Carrier Tape & Reel Dimensions
Application
A
B
C
J
T1
T2
W
P
E
SOP-8
330
±
1
62
±
1.5
12.75 +
0.1 5
2 + 0.5
12.4 +0.2
2