DATA SHEET
Bipolar Analog Integrated Circuit
µ
PC1909
SWITCHING REGULATOR CONTROL IC
The
µ
PC1909 is a switching regulator control IC ideal for primary side control of active-clamp type
Note
DC/DC
converters. This IC has 2 outputs employing a totem-pole circuit with peak output current 1.2 A, and is capable of
directly driving a power MOS-FET. As a result, it has been possible to realize primary side control of an active-clamp
type converter on a single chip.
Note
It is necessary to obtain license from Vicor Corporation before using the
µ
PC1909 in an active-clamp type
circuit.
FEATURES
• 2 on-chip outputs; for Q and Q
• Capable of directly driving a power MOS-FET
• Drive supply voltage range: 7 V to 24 V
• On-chip remote control circuit
• On-chip pulse-by-pulse overcurrent protection circuit
• On-chip overvoltage latch circuit
ORDERING INFORMATION
Part Number
Package
16-pin plastic DIP (300 mils)
16-pin plastic SOP (300 mils)
µ
PC1909CX
µ
PC1909GS
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. G14309EJ1V0DS00 (1st edition)
Date Published July 1999 N CP(K)
Printed in Japan
©
1999
µ
PC1909
BLOCK DIAGRAM
C
T
16
R
T
15
V
REF
14
DTC
1
13
FB
12
PWM
comparator 1
–
+
+
OUT
1
11
EMI
1
10
V
CC
9
Oscillator
Reference
power
supply
OLS
ON/OFF
control
Over-
voltage
protection
Over-
current
protection
+
–
–
PWM
comparator 2
1
OV
2
C
T2
3
GND
4
OC
5
DTC
2
6
OUT
2
7
ON/OFF
8
EMI
2
2
Data Sheet G14309EJ1V0DS00
µ
PC1909
PIN CONFIGURATION (TOP VIEW)
16-pin plastic DIP (300 mils)
µ
PC1909CX
16-pin plastic SOP (300 mils)
µ
PC1909GS
OV
C
T2
GND
OC
DTC
2
OUT
2
ON/OFF
EMI
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C
T
R
T
V
REF
DTC
1
FB
OUT
1
EMI
1
V
CC
PIN FUNCTION LIST
Pin Number
1
2
3
4
5
6
7
8
Pin Name
OV
C
T2
GND
OC
DTC
2
OUT
2
ON/OFF
EMI
2
Function
Overvoltage protection
OLS shift setting
Ground
Overcurrent protection
OUT
2
dead-time setting
OUT
2
output
ON/OFF control
OUT
2
emitter
Pin Number
9
10
11
12
13
14
15
16
Pin Name
V
CC
EMI
1
OUT
1
FB
DTC
1
V
REF
R
T
C
T
Function
Power supply
OUT
1
emitter
OUT
1
output
Feedback input
OUT
1
dead-time setting
Reference voltage output
Timing resistance
Timing capacitance
Data Sheet G14309EJ1V0DS00
3
µ
PC1909
ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings (Unless otherwise specified, T
A
= 25°C)
°
Parameter
Supply Voltage
Output Current (DC, per output)
Output Current (peak, per output)
Total Power Dissipation
Operating Ambient Temperature
Operating Junction Temperature
Storage Temperature
Symbol
V
CC
I
C (DC)
I
C (peak)
P
T
T
A
T
J
T
stg
1000
−20
to +85
−20
to +150
−55
to +150
µ
PC1909CX
26
100
1.2
µ
PC1909GS
Unit
V
mA
A
694
mW
°C
°C
°C
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is, the absolute maximum ratings are rated values at which the product is on
the verge of suffering physical damage, and therefore the product must be used under
conditions that ensure that the absolute maximum ratings are not exceeded.
Recommended Operating Conditions
Parameter
Supply Voltage
Oscillation Frequency
Output Load Capacitance
Output Load Resistance
Operating Junction Temperature
Symbol
V
CC
f
OSC
C
L
R
L
T
J
10
−20
+100
MIN.
7
50
TYP.
10
200
2200
MAX.
24
500
3000
Unit
V
kHz
pF
kΩ
°C
4
Data Sheet G14309EJ1V0DS00
µ
PC1909
Electrical Characteristics (Unless otherwise specified, T
A
= 25°C, V
CC
= 10 V, R
T
= 10 kΩ, fosc = 200 kHz)
°
Ω
Block
Total
Parameter
Standby Current
Circuit Current
Under-
Voltage
Lockout
Circuit
Reference
Voltage
Start-Up Threshold Voltage
Operating Voltage Hysteresis
Width
Output Voltage
Line Regulation
Symbol
I
CC (SB)
I
CC
V
CC (L to H)
V
H
Conditions
V
CC
= 7 V
Without load
6
8
3
MIN.
TYP.
0.1
12
9
4
18
10
5
MAX.
Unit
mA
mA
V
V
V
REF
REG
IN
I
REF
= 0 A
8 V
≤
V
CC
≤
15 V,
I
REF
= 0 A
1 mA
≤
I
REF
≤
4 mA
−10°C ≤
T
A
≤
+85°C,
I
REF
= 0 A
I
REF
= 0 A
4.7
4.9
1
5.1
10
V
mV
Load Regulation
Output Voltage Temperature
Coefficient
Short Circuit Current
Oscillation
Oscillation Frequency
Frequency Line Regulation
Frequency Temperature
Coefficient
PWM
Comparator
Input Bias Current
REG
L
6
400
12
(700)
mV
∆
V
REF
/
∆
T
I
O short
f
OSC
µ
V/°C
mA
15
180
200
1
2
(5)
220
kHz
%
%
∆
f/
∆
V
∆
f/
∆
T
I
B (COMP1)
I
B (COMP2)
8 V
≤
V
CC
≤
15 V
−10°C ≤
T
A
≤
+85°C
V
COMP1
= V
REF
V
COMP2
= V
REF
1.5
3.5
−10°C ≤
T
A
≤
+85°C,
V
D
= 0.46 V
REF
I
SINK
= 3 mA
I
SOURCE
= 30 mA
R
L
= 15
Ω,
C
L
= 2200 pF
R
L
= 15
Ω,
C
L
= 2200 pF
2.4
2.2
0.1
190
V
CC
= 0 V
V
CC
−
1.6
60
40
2.6
2.4
0.2
210
200
150
2
V
OV
= V
REF
2
750
2.4
3
10
10
µ
A
µ
A
V
V
%
Low-level Threshold Voltage
High-level Threshold Voltage
Dead-time Temperature
Coeficient
Output
Low-level Output Voltage
High-level Output Voltage
Rise Time
Fall Time
Remote
Control
Input Voltage at Output ON
Input Voltage at Output OFF
Hysteresis Width
Overcurrent
Latch
Overcurrent Threshold Voltage
Input Bias Current
Delay to Output
Overvoltage
Latch
Overvoltage Threshold Voltage
Input Bias Current
OVL Reset Voltage
Delay to Output
V
TH (L)
V
TH (H)
∆
DT/
∆
T
V
OL
V
OH
t
r
t
f
V
IN (ON)
V
IN (OFF)
V
H
V
TH (OC)
I
B (OC)
t
d (OC)
V
TH (OV)
I
B (OV)
V
R (OV)
t
d (OV)
0.5
V
V
ns
ns
2.8
2.6
0.3
230
V
V
V
mV
µ
A
ns
2.8
4
V
µ
A
V
ns
Remark
Values in parentheses ( ) represent reference values.
Data Sheet G14309EJ1V0DS00
5
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