SI9145BQ-T1 Vishay, SI9145BQ-T1 Datasheet - Page 8

• Manufacturer Part Number: SI9145BQ-T1
• Description: IC, PWM CONTROLLER, 16-TSSOP
• Manufacturer: Vishay

Specifications of SI9145BQ-T1

• Primary Input Voltage: 7V
• No. Of Outputs: 1
• Output Voltage: 2.6V
• Output Current: 200mA
• No. Of Pins: 16
• Operating Temperature Range: -25°C To +85°C
• Power Dissipation Pd: 925mW
• Termination Type: SMD
• Number Of Outputs: Single Output
• Topology: Boost, Buck, Flyback, Forward
• Switching Frequency: 2000 KHz
• Duty Cycle (max): 100 %
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Package / Case: TSSOP-16
• Mounting Style: SMD/SMT
• Synchronous Pin: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Si9145
Vishay Siliconix
PIN DESCRIPTION
Pin 1: V
The positive power supply for all functional blocks except
output driver. A bypass capacitor of 0.1 mF (minimum) is
recommended.
Pin 2: MODE SELECT
This pin is used to enable maximum duty cycle limit and set
output polarity of controller. When connected to V
maximum duty cycle function is controlled by the D
The maximum duty cycle limit is usually used for forward,
flyback, and boost converters. The output polarity is high when
the PWM circuitry requires the external device to be turned on.
When connected to GND, the maximum duty cycle is not
limited (usually for buck converters driving a p-channel MOS).
The output polarity is low when the PWM circuitry requires the
external PMOS to be turned on.
Pin 3: D
D
the PWM circuitry when the MODE SELECT = V
When D
held low (0% duty cycle). When D
(typical), the PWM circuitry can achieve 100% duty cycle. With
www.vishay.com
8
PIN CONFIGURATIONS
Si9145BY-T1
Si9145BY-T1—E3
MAX
MODE SELECT
ORDERING INFORMATION−SOIC-16
/SS pin controls the maximum duty cycle achievable by
D
Part Number
MAX
MAX
DD
MAX
COMP
V
GND
V
REF
/SS
/SS is at less than 1.0 V (typical) the OUTPUT is
FB
DD
NI
/SS
1
2
3
4
5
6
7
8
SOIC-16
Top View
Temperature Range
MAX
/SS is at more than 1.5 V
−25_ to 85_C
25_ to 85_C
16
15
14
13
12
10
11
9
V
OUTPUT
P
UVLO
ENABLE
OTS
C
R
S
GND
OSC
OSC
DD
SET
MAX
.
/SS pin.
DD
, the
MODE SELECT
voltage at D
duty cycle is proportionally limited to this voltage.
The addition of external components can implement a soft
start function.
Pin 4: COMP
This pin is the output of the error amplifier. A compensation
network is connected from this pin to the FB pin to stabilize the
system. This pin drives one input of the internal pulse width
modulation comparator.
Pin 5: FB
The inverting input of the error amplifier. External resistors are
connected to this pin to set the regulated output voltage. The
compensation network is also connected to this pin.
Pin 6: NI
The non-inverting input of the error amplifier.
operation it is externally connected to the V
Pin 7: V
This pin supplies 1.5 V trimmed to "1.5%. The reference
voltage is generated by a band-gap reference.
Pin 8: GND
Negative return for V
Si9145BQ-T1
Si9145BQ-T1—E3
ORDERING INFORMATION−TSSOP-16
D
MAX
COMP
Part Number
V
GND
V
REF
/SS
REF
FB
DD
NI
MAX
1
2
3
4
5
6
7
8
/SS between 1.0 V and 1.5 V, the maximum
DD
TSSOP-16
Top View
.
Temperature Range
16
15
14
13
12
10
11
−25_ to 85_C
9
S-40710—Rev. K, 19-Apr-04
25_ to 85_C
Document Number: 70021
V
OUTPUT
P
UVLO
ENABLE
OTS
C
R
S
GND
OSC
OSC
REF
SET
pin.
In normal