Fairchild Semiconductor KA337TU Datasheet
©2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0
Features
• Output current in excess of 1.5A
• Output voltage adjustable between -1.2V and - 37V
• Internal thermal overload protection
• Internal short circuit current limiting
• Output transistor safe area compensation
• Floating operation for high voltage applications
• Standard 3-pin TO-220 package
Description
The KA337 is a 3-terminal negative adjustable regulator. It
supply in excess of 1.5A over an output voltage range
of -1.2V to - 37V. This regulator requires only two external
resistor to set the output voltage. Included on the chip are
current limiting, thermal overload protection and safe area
compensation.
TO-220
1. Adj 2. Input 3. Output
1
Internal Block Diagram
1
Voltage
Reference
-
+
2
Protection
Circuitry
3
Output
Input
Vadj
KA337
3-Terminal 1.5A Negative Adjustable Regulator
KA337
2
Absolute Maximum Ratings
Electrical Characteristics
(VI - VO = 5V, IO = 40mA, 0°C
≤ T
J
≤ +125°C, P
DMAX
= 20W, unless otherwise specified)
Note:
1. Load and line regulation are specified at constant junction temperature. Change in V
O due to heating effects
must be taken into
account separately. Pulse testing with low duty is used.
2. C
ADJ
, when used, is connected between the adjustment pin and ground.
Parameter Symbol Value Unit
Input-Output Voltage Differential IV
I
- VOI40 V
Power Dissipation P
D
Internally limited W
Operating Temperature Range T
OPR
0 ~ +125 °C
Storage Temperature Range T
STG
-65 ~+125 °C
Parameter Symbol Conditions Min Typ. Max. Unit
Line Regulation (Note1) R
line
TA = +25°C
3V ≤
I
V
I
- V
O
I
≤ 40V
-0.010.04
%/ V
3V ≤ I
VI - V
O
I
≤ 40V - 0.02 0.07
Load Regulation (Note1) R
load
TA = +25°C
10mA ≤ I
O
≤ 0.5A
-1550
mV
10mA ≤ I
O
≤ 1.5A - 15 150
Adjustable Pin Current I
ADJ
- - 50 100 µA
Adjustable Pin Current ∆I
ADJ
TA =+ 25°C
10mA ≤ I
O
≤ 1.5A
3V ≤
I
VI - V
O
I
≤ 40V
-25µA
T
A
=+ 25°C -1.213 -1.250 -1.287
Reference Voltage V
REF
3V ≤
I
V
I
- V
O
I
≤ 40V
10mA ≤ I
O
≤ 1.5A
-1.200 -1.250 -1.300 V
Temperature Stability ST
T
0°C ≤ Τj ≤ +125°C - 0.6 - %
Minimum Load Current to Maintain
Regulation
I
L(MIN)
3V ≤
I
V
I
- V
O
I
≤ 40V - 2.5 10
3V ≤
I
V
I
- V
O
I
≤ 10V - 1.5 6 mA
Output Noise e
N
TA =+25°C 10Hz ≤ f ≤10KHz - 3×V
OUT
-V/10
6
Ripple Rejection Ratio RR
V
O
= -10V, f = 120Hz - 60 -
C
ADJ
= 10µF (Note2) 66 77 - dB
Long Term Stability ST T
J
= 125°C ,1000Hours - 0.3 1 %
Thermal Resistance Junction to Case R
θJC
--4-°C/ W
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