BD8150KVT ROHM Co. Ltd., BD8150KVT Datasheet - Page 6

• Manufacturer Part Number: BD8150KVT
• Description: System Power Supplies Power Suuply Ic Series For Tft-lcd Panels
• Manufacturer: ROHM Co. Ltd.

•VREF
•ERRAMP
•OSC
•Timer latch
•PWM/driver
•UVLO
•Soft start
•DET
Pin Description
Block Description
This block outputs a highly accurate reference voltage of 2.5V and has a current capacity of over 1mA. ON/OFF control is
possible using the CTL pin.
This is an error amp that amplifies and outputs the NON and INV voltage differential. The output pulse duty is determined by
the output FB voltage. When FB is 1.95V or more it is switched OFF, and when 1.45V or less the output NPN Tr is switched
ON.
This block determines the RT and CT switching frequency. The triangular waveform is determined by RT and CT.
This is a protection circuit that detects output short-circuits (when the error amp output is 1V or less). Once activated, the
timer begins charging the SCP terminal capacitance at 7µA. When the SCP voltage is 1.8V or more, the latch is applied and
shutdown begins. Recovery can be accomplished by turning on Vcc and CTL.
This is a PWM comparator that determines the duty by comparing the error amp output and the oscillator triangular
waveform in order to determine the maximum duty ratio for the DTC. It is turned to OFF when the DTC voltage is 1.95V and
turned ON at 1.45V. Use the VREF resistance division to set the DTC voltage.
This is a protective circuit that shuts down the system when the input voltage becomes 2.5V in order to prevent IC
malfunction. A 0.1V hysteresis exists and reset is implemented once the voltage is at least 2.6V.
Soft start is activated during startup in order to prevent DC/DC converter inrush current. The delay time depends on the pin
capacitance. The circuit is set to LOW when a protective circuit is triggered. When reset, soft start will once again operate at
startup.
This is a comparator that detects whether each output voltage is output as set. When output as set, High is output to pins
DET1 to DET4. When all of the DET pins are High, the ENABLE pin is set to High.
Pin No.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
9
Pin Name
AMPGND
REGV
OUT9
OUT8
OUT7
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
OUT0
DET1
DET2
DET3
DET4
V
COM
INV5
IN8
IN9
IN+
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN-
CT
REG
CC
DC/DC detector output 1
DC/DC detector output 2
Charge pump detector output 3
Charge pump detector output 4
Buffer amp 0 input
Buffer amp 1 input
Buffer amp 2 input
Buffer amp 3 input
Buffer amp 4 input
Buffer amp 5 input
Buffer amp 6 input
Buffer amp 7 input
Buffer amp 8 input
Buffer amp 9 input
Op-amp non inverting input
Op-amp inverting input
Buffer amp and op-amp ground
Op-amp output
Buffer amp 9 output
Buffer amp 8 output
Buffer amp 7 output
Buffer amp 6 output
Buffer amp 5 output
Buffer amp 4 output
Buffer amp 3 output
Buffer amp 2 output
Buffer amp 1 output
Buffer amp 0 output
Charge pump, Regulator, op-amp and
buffer amp power supply
Regulator output
Regulator negative feed back input
Ramp wave monitor
Function
Pin No.
6/16
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
59
60
61
62
63
64
57
58
Pin Name
ENABLE
VREF17
UDSEL1
UDSEL2
PGND
NON4
NON2
DTC1
DTC2
PV
CTL4
CTL3
CTL2
CTL1
INV3
INV2
GND
INV1
SCP
GD2
CD4
CD3
GD1
SS1
SS2
FB4
FB3
FB2
FB1
V
BG
PG
CC
CC
Connect timer latch capacitor
All channel output enable
Charge pump feed back input 4
Charge pump E/A output 4
Charge pump driver output 4
Charge pump driver output 3
Charge pump E/A output 3
Charge pump feed back input 3
Reference voltage monitor
1.7V Reference Voltage
DC/DC E/A non inverting input 2
DC/DC E/A inverting input 2
DC/DC E/A output 2
Ground
Power ground
DC/DC driver output 2
DC/DC driver output 1
Power V
V
DC/DC E/A output 1
DC/DC E/A inverting input 1
Pch FET switch driver output
Connect soft start capacitor 1
Connect soft start capacitor 2
Dead time control voltage input1
Dead time control voltage input2
Charge pump control switch 4
Charge pump control switch 3
DC/DC control switch 2
Step up/down select switch 1
Step up/down select switch 2
DC/DC control switch 1
CC
supply
CC
supply
Function