1717

NTE1717
Integrated Circuit
VCR Dual Switching Regulator
Description:
The NTE1717 is a dual monolithic PWM (pulse−width modulated) switching regulator. Each regulator
block contains a 5V reference voltage supply, a saw−tooth wave oscillator, an error amplifier, a
comparator, and a driver. The 9V stop feature that shuts off the 9V regulator block, and the ripple
regulation for use with car batteries make this device best suited as a 5V and 9V power supply for
portable VCRs.
Features:
D The 9V stop feature of the 9V regulator can make only the 5V regulator enabled.
D Direct feedback can drastically reduce ripple
D VREG output is available
D The driver’s output duty ratio is variable from 0 to 100%, so that the driver output can be completely turned on or off.
D Accurate oscillation frequency, with stable start−up and temperature characteristics.
D Error amplifiers with internal phase compensation
D Reference square−wave OSC output available
D High conversion efficiency
Applications:
Power supply for VCRs
Power supply for general−purpose equipment
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Power Dissipation, PD (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340mW
Operating temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 to +60°C
Storage temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55 to +125°C
VREG drain current, IP(VREG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Sink current, pin 8, I8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Sink current, pin 10, I10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Note 1. Derating is done at 3.4mW/°C for operation above TA = 25°C
Electrical Characteristics: (TA = +25°C, VCC = 12V, unless otherwise specified)
Parameter
Min
Typ
Max
Unit
8
−
16
V
IO
−
5.5
8.0
mA
VREG output voltage
VREG
4.65
4.8
4.95
V
Input regulation 9V output
VO9−G
−0.1
−
+0.1
V
4.7
5.0
5.3
V
−0.1
−
+0.1
V
IO9 = 400mA, IO5 = 50mA
−
−
3.75
mA
−
36
41
46
kHz
RA = 36kΩ, RB = 12kΩ,
CT = 1000pF 10V ≤
VCC ≤ 16V
−
−0.3
−
%
Supply voltage range
Quiescent current
5V output voltage
Input regulation 5V output
Simple efficiency
Oscillation frequency
Oscillation frequency input
regulation
Symbol
VCC
Test Conditions
4.2V < VREG < 5.4V
10V ≤ VCC ≤ 16V
VO5
VO5−G
IO
f
∆f−R
10V ≤ VCC ≤ 16V
Reference oscillation output
voltage−high
D
14
20
26
%
Reference oscillation voltage−
high
H
3.7
−
−
V
Reference oscillation output duty
D
74
80
86
%
Reference oscillation output
voltage
H
3.7
−
−
V
9V stop input high voltage
VH
VO9 < 0.4V
1.5
−
−
V
9V stop input low voltage
VL
8.3V < VO9 < 9.7V
−
−
0.9
V
Pin Connection Diagram
16 VCC
15
Discharge
14
Cap
13
OSC
12 OSC
Amp Input
11 Error
(+5V)
10 5V Drive
9
GND (2)
68
7
9V Drive
9V Stop
GND (1)
5
Filter
Error Amp Input
4 (+9V)
3 Error Amp Input
(−9V)
2 1/2 VREG
1 VREG
.110 (2.79)
.768 (19.5)
.079 (2.0)
.039 (1.0) R
.228
(5.8)
.390
(9.9)
.012 (0.30)
.022 (0.56)
.050 (1.27)
1
3
2
5
4
.750 (19.05)
7
9 11
6
8
.108 (2.7)
13 15
10 12
14 16