DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
PC1909
SWITCHING REGULATOR CONTROL IC
DESCRIPTION
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 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 (7.62 mm (300))
16-pin plastic SOP (7.62 mm (300))
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. G14309EJ2V0DS00 (2nd edition)
Date Published November 2000 NS CP(K)
Printed in Japan
The mark
5
shows major revised points.
©
1999
µ
PC1909
5
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 G14309EJ2V0DS00
µ
PC1909
PIN CONFIGURATION (Top View)
16-pin plastic DIP (7.62 mm (300))
µ
PC1909CX
16-pin plastic SOP (7.62 mm (300))
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
5
Pin Name
C
T
C
T2
DTC
1
DTC
2
EMI
1
EMI
2
FB
GND
OC
ON/OFF
OUT
1
OUT
2
OV
R
T
V
CC
V
REF
: Timing Capacitance
: OLS Shift Control
: OUT
1
Dead Time Control
: OUT
2
Dead Time Control
: OUT
1
Emitter
: OUT
2
Emitter
: Feedback Input
: Ground
: Over Current Protection
: ON/OFF Control
: OUT
1
Output
: OUT
2
Output
: Over Voltage Protection
: Timing Resistance
: Power Supply
: Reference Voltage
Data Sheet G14309EJ2V0DS00
3
µ
PC1909
CONTENTS
1. PIN FUNCTION LIST........................................................................................................................................... 5
2. ELECTRICAL SPECIFICATIONS......................................................................................................................... 6
5
3. OPERATION OVERVIEW...................................................................................................................................... 11
3.1 Startup............................................................................................................................................................. 11
3.2 Steady Operation............................................................................................................................................ 13
3.3 Overcurrent Limitation Operation................................................................................................................. 15
3.4 On/Off Operation.............................................................................................................................................16
3.5 Overvoltage Protection Operation................................................................................................................ 17
5
4. SETTINGS..............................................................................................................................................................18
4.1 Controller Settings......................................................................................................................................... 18
4.2 Startup Circuit, Low Voltage Malfunction Prevention Circuit Settings..................................................... 18
4.3 Oscillator Settings.......................................................................................................................................... 21
4.4 Dead Time Setting.......................................................................................................................................... 22
4.4.1 Level shift setting..................................................................................................................................... 22
4.4.2 Dead time adjustment.............................................................................................................................. 24
4.5 Duty Settings...................................................................................................................................................25
4.5.1 Maximum duty setting.............................................................................................................................. 25
4.5.2 Minimum duty limit................................................................................................................................... 25
4.5.3 Soft start...................................................................................................................................................25
4.6 Remote Control............................................................................................................................................... 26
4.7 Overcurrent Limiter Settings......................................................................................................................... 27
4.8 Overvoltage Protection Circuit Setting.........................................................................................................28
4.9 Output Circuit..................................................................................................................................................29
5. PACKAGE DRAWINGS........................................................................................................................................ 30
6. RECOMMENDED SOLDERING CONDITIONS................................................................................................... 32
4
Data Sheet G14309EJ2V0DS00
µ
PC1909
5
1. PIN FUNCTION LIST
Pin No.
1
Symbol
OV
Overvoltage protection
This is the input pin of the overvoltage detection comparator. Directly connect this pin to GND when not used.
2
C
T2
OLS shift setting
The resistor that determines the amount of level shift for dC
T
(an internal triangle wave that is a level-shifted C
T
)
is connected between this pin and the V
REF
pin.
3
GND
Ground
This is the signal ground pin.
4
OC
Overcurrent protection
This is the input pin of the overcurrent detection comparator. Directly connect this pin to GND when not used.
5
DTC
2
OUT
2
dead time setting
This pins sets the dead time of the OUT
2
output.
6
OUT
2
OUT
2
output
This is the subswitch drive output pin.
7
ON/OFF
ON/OFF control
The output circuit can be switched on or off by inputting an external signal.
Directly connect this pin to V
REF
when not used.
8
EMI
2
OUT
2
emitter
This is a power supply ground pin. This pin must be isolated from the signal ground pin (GND).
9
10
V
CC
EMI
1
Power supply
OUT
1
emitter
This is a power supply ground pin. This pin must be isolated from the signal ground pin (GND).
11
OUT
1
OUT
1
output
This is the main switch drive output pin.
12
FB
Feedback input
This is the feedback input pin of PWM comparators 1 and 2.
13
DTC
1
OUT
1
dead time setting
This pin sets the maximum duty of the OUT
1
output and determines the minimum duty of the OUT
2
output.
14
V
REF
Reference voltage
This pin outputs a 4.9-V TYP. reference voltage.
15
R
T
Timing resistance
The resistor that determines the oscillation frequency is connected between this pin and GND.
16
C
T
Timing capacitance
The capacitor that determines the oscillation frequency is connected between this pin and GND.
This pin outputs a triangle wave.
Function
Data Sheet G14309EJ2V0DS00
5
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