TDA9109A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA9109A' PDF : 47 Pages View PDF
TDA9109A
B+ SECTION
Operating Conditions
Symbol
FeedRes
Parameter
Minimum Feedback Resistor
Test Conditions
Resistor between
Pins 15 and 14
Min.
5
Typ. Max.
Electrical Characteristics (VCC = 12V, Tamb = 25°C)
Symbol
Parameter
Test Conditions
OLG
Error Amplifier Open Loop Gain
At low frequency (15)
UGBW
Unity Gain Bandwidth
(see 15)
Min.
Typ.
85
6
Max.
IRI
Regulation Input Bias Current
Current sourced by
Pin 15 (PNP base)
0.2
EAOI
Error Amplifier Output Current
Current sourced by
1.4
Pin 14
Current sunk by Pin 14 2
(See 20)
CSG
Current Sense Input Voltage Gain
Pin 16
3
MCEth
Max Current Sense Input Threshold
Voltage
Pin 16
1.3
ISI
Current Sense Input Bias Current
Current sunk by Pin 16
(PNP base)
1
Tonmax
B+OSV
IVREF
Maximum ON Time of the external
power transistor
B+Output Saturation Voltage
Internal Reference Voltage
% of horizontal period
fo = 27kHz (See 21)
V28 with I28 = 10mA
On error amp (+) input
for Subaddress OB
Byte 1000000
100
0.25
5
VREFADJ
Internal Reference Voltage Adjustment Byte 01111111
Range
Byte 00000000
+20
-20
PWMS EL
Threshold for step-up/step-down
selection
Pin 16
6
tFB+
Fall Time
Pin 28
100
Note: 20 0.5mA are sunk when B+ section is disabled. the purpose is to discharge the soft-start capacitor.
Note: 21 The external power transistor is OFF during 400ns of the HFOCUSCAP discharge
Units
kΩ
Units
dB
MHz
µA
mA
mA
V
µA
%
V
V
%
%
V
ns
18/47
Share Link: 
