参数资料
型号: SRP
厂商: Hitachi,Ltd.
元件分类: 基准电压源/电流源
英文描述: High Speed Current Mode PWM Control IC for Switching Power Supply
中文描述: 高速开关电源电流模式PWM控制IC
文件页数: 9/31页
文件大小: 144K
代理商: SRP
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
9
Electrical Characteristics
(cont)
Current Sensing Part
Item
Symbol
Min
Typ
Max
Unit
Test Condition
Note
Voltage gain
A
VCS
Vth
CS
PSRR
2.85
3.00
3.15
V/V
V
FB
= 0 V
1
Maximum sensing voltage
0.9
1.0
1.1
V
Power supply voltage
rejection ratio
70
dB
12 V
V
IN
25 V
2
Input bias current
I
BCS
tpd
–2
–10
μ
A
V
CS
= 2 V
Time from when V
becomes 2 V to when
output becomes “L” (2 V)
Current sensing
response time
50
100
150
ns
3
Notes: 1. The gain this case is the ratio of error amplifier output change to the current-sensing threshold
voltage change.
2. Reference value for design.
3. Current sensing response time tpd is definded a shown in the figure 1.
V
CS
V
OUT
(PWM)
Vth
tpd
Figure 1 Definition of Current Sensing Response Time tpd
PWM Output Part
Item
Symbol
Min
Typ
Max
Unit
Test Condition
Note
Output low voltage 1
V
OL1
V
OL2
V
OH1
V
OH2
V
OL STB
0.7
1.5
V
losink = 20 mA
Output low voltage 2
1.5
2.2
V
losink = 200 mA
1
Output high voltage 1
13.0
13.5
V
losource = –20 mA
Output high voltage 2
12.0
13.3
V
losource = –200 mA
1
Output low voltage at
standby mode
0.8
1.1
V
V
= 5 V,
losink = 1 mA
Rise time
t
r
t
f
Du max
80
150
ns
C
L
= 1000 pF
C
L
= 1000 pF
Fall time
70
130
ns
Maximum ON duty
94
96
100
%
Minimum ON duty
Notes: 1. Pulse application test
Du min
0
%
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